Piglet Growth Research Articles

Changes in Microbial Ecosystems and Serum Metabolomics by Diet Supplementation With Enramycin in Weaning Piglets.

Antibiotics are used in swine production for growth promotion and disease prevention, raising concerns about environmental contamination and antibiotic resistance. In this study, we investigated the effects of enramycin supplementation on piglet growth, gut microbiota and blood metabolites. Enramycin promotes piglet growth and temporarily reduces diarrhoea. Gut microbiota analysis revealed changes in microbial composition, including an increase in the abundance of Limosilactobacillus reuteri. Metabolomic analysis has identified elevated levels of dimethylglycine, a known growth-promoting factor, in the enramycin group. Liver gene expression analysis revealed increased mRNA levels of ALDH and dimethylglycine dehydrogenase, which are enzymes involved in dimethylglycine metabolism. The enramycin-treated group had a higher concentration of acetic acid in caecal contents, and their caecal acetic acid concentrations were positively correlated with the abundance of L. reuteri and the content of serum dimethylglycine, respectively. These findings suggest that the promotion effect of enramycin on piglet growth is related to the gut microbiota, blood metabolites and liver gene expression, which provide insights into antibiotic alternatives for swine production.

Enrichments Adjusted to the Number of Litters: Simple Approach to Improve the Welfare of Weaned Piglets under Farm Conditions.

Environmental enrichment is one of the methods used to reduce conflicts at weaning, which erupt when mixing unknown litters and are known to negatively affect growth and welfare of piglets. Here we aimed to test a simple approach of increasing the amount of existing enrichment objects to mitigate post-weaning aggression. The experiment comprised ten groups of piglets (five controls, five tests) with 3-4 litters weaned in each of them. In the control group, a red hanging plastic object (biting ring) and a piece of spruce wood (7 cm × 7 cm × 30 cm) were used for enrichment. In the test group, the enrichment was multiplied according to the number of weaned litters (one toy and one piece of wood was provided per each mixed litter). On days 1, 3, 5, 7 and 14 after weaning, behaviours (negative social behaviours, pen equipment-directed and enrichment-directed behaviours) and injuries (on different parts of the body, tail lesions, lameness) were recorded. On day 21 after weaning, the overall welfare status of the piglets was assessed using the Welfare Quality® protocol for pigs. A significant (4-fold) increase in the enrichment-directed behaviours was observed in the test group (p < 0.001). Consequently, there were 3.5 times fewer negative social behaviours (p < 0.001), 38-52% fewer injuries on different body parts (p < 0.001) and higher overall welfare status of the piglets in the test group. Adjusting enrichment to the number of weaned litters proved to be an effective solution to reduce aggression at weaning and improve piglets' welfare. The study provides important information on the use of enrichment material in commercial weaner pens and demonstrates the possibility of significantly improving pig welfare with low effort, input and cost.

Chinese Herbal Medicines as Natural Alternative Products to Antibiotics in Weaned Piglets through Intestinal Microbiota Regulation.

During the growth process of weaned piglets, digestive problems such as gastrointestinal disorders and diarrhea are common. Farmers usually use antibiotics to help piglets grow smoothly. However, the overuse of antibiotics can lead to antibiotic resistance issues. Therefore, this study chose to use plant extracts as feed additives to explore their potential as alternatives to antibiotics. Additionally, Tilmicosin was used as the antibiotic because it is widely used in treating respiratory infections in piglets. Since traditional Chinese medicine often uses natural products, we selected Guizhi Li-Zhong (GLZ) extract as an alternative to antibiotics. The experiment involved 126 piglets, each 4 weeks old, which were randomly assigned to one of four groups: the sham group (basal diet without supplements, 10.3 ± 0.4 kg, n = 31), the low-dose GLZ group (basal diet with 0.05% GLZ, 10.9 ± 0.4 kg, n = 32), the regular-dose GLZ group (basal diet with 0.2% GLZ, 10.6 ± 0.4 kg, n = 32), and the regular-dose Tilmicosin antibiotic group (basal diet with 0.2% Tilmicosin, 10.2 ± 0.3 kg, n = 31). We recorded and compared the survival rate, growth rate, feed conversion ratio, and diarrhea incidence among four groups of weaned piglets from the 4th to the 10th weeks of age. Then, we examined the oxidative stress, inflammation, and apoptosis in small intestine tissue (jejunum and ileum) through immunohistochemistry and Western blot and compared the gut microbiota in large intestine tissue (colon and rectum) through a next-generation sequencing (NGS) analysis. Our results showed that weaned piglets supplemented with 0.05% and 0.2% GLZ had better survival rates, growth rates (p < 0.01), and feed conversion ratios (p < 0.01) compared to those receiving sham treatment. Even weaned piglets supplemented with 0.2% GLZ performed better than those supplemented with 0.2% Tilmicosin antibiotics (p < 0.05). Furthermore, the incidence of diarrhea and small intestine injury (indicated by oxidative stress-, inflammation-, and apoptosis-related proteins) in piglets supplemented with 0.05% and 0.2% GLZ was lower than in piglets receiving sham treatment (p < 0.05). Even piglets supplemented with 0.2% GLZ had less injury than those supplemented with 0.2% Tilmicosin antibiotics (p < 0.05). The NGS results further showed that GLZ treatment significantly improved beneficial bacteria in weaned piglets (p < 0.05), while antibiotic treatment reduced beneficial bacteria (p < 0.05). In summary, we recommend adding GLZ to the feed as an alternative to antibiotics. This not only effectively reduces intestinal damage but also improves the gut microbiota, thereby promoting the growth of weaning piglets.

Effect of various levels of standardized ileal digestible branched-chain amino acids on lactating sow and litter performance.

Three hundred and sixty sows were used to investigate the effect of various dietary branched-chain amino acids (BCAA) levels on sow lactation and piglet growth performance. On day 112 ± 1.4 of gestation, sows were blocked by the parity group (P1, P2, P3+) and randomly assigned to 1 of 6 dietary treatments containing various levels of standardized ileal digestible (SID) Leu, Ile, and Val. The experimental diets were formulated to the desired levels of BCAA by replacing cornstarch in a basal diet with l-leucine, l-isoleucine, and l-valine. Dietary BCAA levels relative to SID Lys were 114% or 180% for Leu, 56% or 64% for Ile, and 64% or 120% for Val. Diets were formulated to be isocaloric (3.23 Mcal ME/kg) and met or exceeded all other NRC (2012) essential amino acid and vitamin and mineral recommendations. Sow body weight (BW) and backfat thickness were measured at the time of entry into the farrowing room and at weaning. Piglet litter weights were recorded after cross-fostering and weaning to calculate the litter growth rate. Data were analyzed using generalized linear mixed models with fixed effects of dietary treatment and parity group and a random effect of lactation group. The models were fit using R (v4.4.1; R Core Team, 2024). The sow and her litter were the experimental unit, and results were considered significant if P < 0.05. On average, sows nursed their litters for 21.3 d (P = 0.998). The mean parity by treatment ranged from 3.8 to 3.9 (P = 0.999). After farrowing, the mean sow BW was 220kg with a range between treatments of 216 to 222kg (P = 0.523). On average, sows gained 2.3% of their BW (P = 0.740) with an average daily feed intake of 8.74kg/d (P = 0.903). As expected, sow Leu, Ile, and Val intakes were different across treatments (P ≤ 0.001) and corresponded to the varying dietary levels of BCAA. Sows entered farrowing with an average backfat thickness of 11.50mm (P = 0.919) and lost 6.5% backfat through lactation (P = 0.880). Sows started the trial with an average of 14.1 piglets/sow (P = 0.967) and weaned 12.7 piglets/sow (P = 0.995) with a piglet ADG of 0.22kg/d (P = 0.280) and a daily litter growth rate of 2.90kg/d (P = 0.547). In conclusion, there was no evidence of an effect of the various leucine, isoleucine, and valine levels evaluated in this study on lactating sow and piglet performance.

Lactiplantibacillus argentoratensis AGMB00912 alleviates diarrhea and promotes the growth performance of piglets during the weaning transition

BackgroundPreventing post-weaning diarrhea (PWD) in weaned piglets is a crucial challenge in the swine production industry. The stress of weaning, dietary shifts from maternal milk to solid feed, and environmental changes lead to decreased microbial diversity, increased pathogen abundance, and compromised intestinal integrity. We have previously identified Lactiplantibacillus argentoratensis AGMB00912 (LA) in healthy porcine feces, which demonstrated antimicrobial activity against pathogens and enhanced short-chain fatty acid production. This research aimed to evaluate the efficacy of LA strain supplementation as a strategy to inhibit PWD and enhance overall growth performance in weaned piglets.ResultsLA supplementation in weaned piglets significantly increased body weight gain, average daily gain, and average daily feed intake. It also alleviated diarrhea symptoms (diarrhea score and incidence). Notably, LA was found to enrich beneficial microbial populations (Lactobacillus, Anaerobutyricum, Roseburia, Lachnospiraceae, and Blautia) while reducing the abundance of harmful bacteria (Helicobacter and Campylobacter). This not only reduces the direct impact of pathogens but also improves the overall gut microbiota structure, thus enhancing the resilience of weaned piglets. LA treatment also promotes the growth of the small intestinal epithelial structure, strengthens gut barrier integrity, and increases short-chain fatty acid levels in the gut.ConclusionsThe study findings demonstrate the promising potential of LA in preventing PWD. Supplementation with the LA strain offers a promising feed additive for improving intestinal health and growth in piglets during the weaning transition, with the potential to significantly reduce the incidence and severity of PWD.

Effects of organic and inorganic selenium mixes in pregnant sows on piglet growth, selenium levels in serum and milk, and selenium deposition in newborn piglet tissues.

This study was conducted to evaluate the effects of organic and inorganic selenium mixes in pregnant sows on piglet growth, selenium levels in serum and milk, and selenium deposition in newborn piglet tissues. A total of 44 multiparous sows (Yorkshire×Landrace) with average body weight (BW), backfat thickness, and parity were assigned to one of the three treatments with 14 or 15 sows per treatment in a completely randomized design. The treatments were as follows: i) Control, corn-soybean meal-based diet with no addition of selenium premix; ii) ISOS(mixed inorganic selenium and organic selenium) 30, a basal diet supplemented with 0.15 ppm of inorganic Se and 0.15 ppm of organic Se; iii) ISOS50, a basal diet supplemented with 0.25 ppm of inorganic Se and 0.25 ppm of organic Se. At day 21 of lactation, supplementing a high level of mixed Se at 0.50 ppm resulted in higher piglet BW and weight gain than adding a low level of mixed Se at 0.30 ppm (p<0.05). Selenium concentration of colostrum in sows fed ISOS50 diet was significantly higher than those in sows fed ISOS30 diet (p<0.05). Selenium concentrations in the serum at days 90 and 110 of gestation and 24 hours postpartum were highest when sows were fed ISOS50 diet (p<0.05). Additionally, increasing levels of mixed Se led to an increase in piglet serum Se concentration at 24 hours postpartum (p<0.05). Before ingesting colostrum, piglets from sows fed a mixed selenium (Se) diet had significantly higher kidney Se concentrations compared to those from the control group, with the ISOS50 treatment showing the most significant difference (p<0.05). Supplementation of the gestation diet with 0.5 ppm of mixed Se may improve piglet growth performance, increase Se concentrations in milk, and enhance Se status in the serum of sows, as well as in the serum and tissues of their offspring.

The effect of different weaning strategies on piglet growth, feed intake and gut health.

The present study evaluated the effects of weaning strategy on piglet growth performance, onset of feed intake, and intestinal health. A total of 254 crossbred piglets were used and the experimental period lasted 45 days. The piglets were assigned to the fallowing treatments: early strategic weaning (ESW, n = 85), piglets weaned at 16 days of age and transferred to the pre-nursery unit; strategic segregated weaning (SSW, n = 85), piglets weaned at 21 days of age and kept in the farrowing crate until 24 days of age; and conventional weaning (CW, n = 84), piglet weaned at 24 days of age and transferred directly to the nursery unity; this experimental group was used as a control. Piglets from all treatments were transferred to the nursery unit at 24 days of age. For the nursery phase three periods of evaluation was considered: nursery phase I (0-7 d), nursery phase II (7-14 d), and nursery phase III (14-21 days). Piglets from the ESW and CW had greater (P < 0.001) ADG in the lactation period 16-21 days. The BW at 24day of age was higher (P < 0.001) for piglets in the ESW and CW groups. In the nursery phase I, the ESW group had higher (P = 0.003) daily feed intake. Piglets from the ESW group had higher (P = 0.004) BW at the end of the experimental period. The ESW and SSW groups had a higher percentage of piglets (88% and 92%, respectively; P < 0,001) consuming feed in the first 24h after transference to the nursery facility. When the total experimental period is considered, a reduction (P < 0.001) in the incidence of diarrhea was observed for ESW piglets. Overall, there was no effect of weaning strategy on intestinal permeability. In conclusion, the results of our study showed that the Segregated Strategic Weaning management can be used to mitigate the deleterious effects of early weaning.

Hygienic Floor Management Using Hot Water: A Strategy to Reduce Piglet Mortality in Northeastern India

Background: Pig farming is crucial for the agricultural economy in Northeastern India; yet high piglet mortality remains a significant issue. This study investigates the impact of hot water treatment on floor hygiene in farrowing pens to address this challenge. Methods: Thirty-six Hampshire piglets were divided into two groups: a control group with untreated floors and a treatment group with floors cleaned biweekly with hot water at 70°C. Growth performance, feed intake, Feed Conversion Ratio (FCR), incidence of diarrhea, and mortality rates were assessed. Results: Results indicated that piglets on hot water-treated floors exhibited slightly higher body weight gains and improved FCR compared to the control group. Diarrhea incidence was lower in the treatment group, which also had no mortality, while the control group experienced an 11.1% mortality rate. Conclusion: The study concludes that hot water treatment effectively enhances piglet health and growth, suggesting its potential as a valuable management practice in pig farming. Further research with varied treatment frequencies is recommended.

PSLBII-4 The effect of standardized ileal digestible sulfur amino acid intake during late gestation on gilt whole-body nitrogen retention and subsequent litter performance

Abstract Gestating gilts [n = 27; body weight (BW) = 158 ± 5.5 kg] were used to determine the effect of standardized ileal digestible (SID) sulfur amino acid (SAA) intake during late gestation on whole-body nitrogen (N) retention and subsequent litter performance. Gilts were assigned to one of two experimental diets that provided SAA at 60 or 200 % of estimated requirements during late gestation (0.29 and 0.92 % SID SAA, respectively; n = 15 and 12, respectively; Table 1 and 2). Each gilt received 2.53 kg of the assigned diet between gestation d 90 and farrowing; standard lactation and nursery diets were provided to gilts after farrowing and offspring after weaning, respectively. Gilt whole-body N balance was determined between d 107 and 109 of gestation using total urine collection and fecal grab-sampling. After farrowing, litters were standardized to 13 piglets and were not offered creep feed. Whole-body N retention was greater in gilts fed the diet containing 0.92 vs. 0.29 % SID SAA in late gestation (27.2 vs. 19.3 ± 1.8 g/d; P &amp;lt; 0.05; Table 3), but the number of piglets born alive, litter birth weight, subsequent piglet growth rates, and litter size at weaning were not different between treatment groups. The post-weaning growth performance of offspring was also not influenced by maternal dietary treatment in late gestation (Table 4). At farrowing, the post-absorptive plasma concentration of Cys tended to be less (P = 0.072) and taurine was greater (P &amp;lt; 0.01) for gilts fed 0.92 vs. 0.29 % SID SAA in late gestation; however, there were no differences in plasma SAA metabolites concentrations for gilts at weaning or offspring at birth (Table 5. At weaning, offspring from gilts fed 0.92 % SID SAA had greater plasma homocysteine (P &amp;lt; 0.05) and plasma Cys concentrations (tendency; P = 0.072) vs. offspring from gilts fed 0.29 % SID SAA in late gestation. Three weeks after weaning, plasma taurine concentration was less (P &amp;lt; 0.05) for offspring from gilts fed 0.92 vs. 0.29 % SID SAA in late gestation (Table 6). Six weeks after weaning, plasma glutathione concentration tended to be less (P = 0.057) for offspring from gilts fed 0.92 vs 0.29 % SID SAA in late gestation. When SAA were fed below estimated requirements during late gestation, whole-body N retention was reduced, but fetal growth appeared to be maintained, likely at the expense of maternal N retention. Such divergences in dietary SAA supply in late gestation had no effect on subsequent offspring growth performance, but it appeared that offspring SAA metabolism was impacted until at least 6 wk after weaning. The influence of differences in sulfur AA metabolites on offspring performance beyond the nursery phase remains unknown. Therefore, carry-over effects of maternal SAA supply in late gestation should be considered when developing feeding recommendations for gestating gilts.

383 Performance of piglets in response to graded dietary supplementation of sulfur amino acids using either hydroxy-methionine or DL-Methionine during the post-weaning period

Abstract Providing piglets with their precise nutritional need is critical during the stressful post-weaning period. Methionine (Met), a sulfur-containing amino acid, has a crucial role in piglet growth and health. Stressful conditions may increase Met demand due to its involvement in maintaining redox balance via downstream metabolites such as glutathione. There are different sources of supplementary Met for pigs such as DL-methionine (DL-Met) and hydroxy-methionine. The latter comes mostly as an acidic liquid form (OH-Met) and to a lesser degree as a powder calcium-salt (OH-Met-Ca). This study investigates the effect of graded levels of dietary total sulfur amino acids (TSAA) by supplementing different sources of Met on the performance and capacity of post-weaning piglets to respond to stress. Two experiments were performed. In experiment 1, post-weaning piglets [n = 90; 28 d of age; body weight (BW) = 9.13 ± 0.65 kg] were fed with either DL-Met or OH-Met-Ca to provide 80%, 100%, and 125% TSAA recommendations of NRC and performance parameters were measured for 41 d. Treatments were replicated nine times, and blocking was done according to initial BW. For experiment 2, 720 post-weaning piglets (n = 720; 28 d of age; BW = 6.84 ± 1.07 kg) from three consecutive breeding batches were fed with either DL-Met, OH-Met, or OH-Met-Ca at or above (100% or 125%) TSAA requirements of FEDNA. Performance parameters and oxidative status through various plasma indicators were measured. Treatments were replicated 12 times. Data from both experiments were analyzed separately using a mixed effect model with Met source and level as fixed effects (and their interaction in experiment 2) and blocks and batch as random effects for experiments 1 and 2, respectively. In experiment 1, piglets fed 80% of TSAA requirement showed the least average daily weight gain, while those fed OH-Met-Ca at 100% or DL-Met at 125% requirement had the greatest BW gain among the treatments (P &amp;lt; 0.01). Feed conversion ratio was best for piglets fed with OH-Met-Ca at 100% requirement, while animals fed with 80% requirement were the least efficient (P = 0.04). Contrasts showed no differences between Met sources (P ≥ 0.51) and level of TSAA (P ≥ 0.56) for any of the parameters. Meanwhile in experiment 2, there were no interactions between Met source and TSAA level (P &amp;gt; 0.10). The Met source did not affect any parameter (P ≥ 0.14). However, there was a significant decrease in daily feed intake when piglets were fed above requirements (P = 0.02), and a significant increase in the concentration of plasma glutathione peroxidase when piglets were fed at TSAA requirements (P &amp;lt; 0.05). These results suggest that post-weaning piglet performance and oxidative status can be sustained regardless of the Met source tested. Feeding healthy and unchallenged piglets with excess dietary Met may not bring extra benefits.

447 Ex-food4feed: Keeping nutrients in the food chain - Sponsored by EAAP

Abstract The growing world population and rising income in developing countries create more demand for animal products. However, natural resources such as land, water, and nutrients are not boundless. As a consequence, competition of resources in food and feed production is an issue to be confronted with. One promising solution is relocating food losses into animal feeding, propelling the course of sustainability and circular economy in the livestock sector. Given this scenario, former food products (FFPs) represent great opportunities. Instead of ending up in landfill or compost, a better destination for FFPs is to be used as feedstuffs to replace traditional ingredients. FFPs are foodstuffs not accepted by the human market but have several advantages enabling them to enter swine feeding programs. FFPs are mainly composed of processed and ready-to-eat food products such as snacks and bakery goods. Thanks to industrial processing and their product type nature, FFPs are rich in easily digestible starch, simple sugars, fat, and energy contents comparable with cereal grains. Based on their nutritional features, these materials are extremely rich in carbohydrates, free sugars and, depending on their origin, also in fats. In addition, FFPs are often characterized by a high degree of processing including technological and heat treatments which can affect not only the availability of nutrients and the kinetics of digestion, but also gastro-intestinal health and animal response. On fresh matter basis, FFPs can substitute conventional feed ingredients up to 30 % in the diets of pigs. Starting from post-weaning piglets, FFP-based diet is able to maintain piglet growth without substantial effects on hindgut microbiota. In growing-finishing pigs, FFP-based diets at a 30 % inclusion level support growth performance of pigs without altering their nutrient and energy deposition efficiency, live body and carcass composition, and general meat quality traits. When considering liver proteome and plasma peptidome of pigs fed such diets, minor modulation occurs. To sum up, while maintaining the performance and wellbeing of pigs, the use of FFPs up to 30 % to replace classic feedstuffs represents a great potential in: i) mitigating food-feed competition, ii) re-distributing valuable food losses to livestock sector to produce animal protein, and iii) reducing environmental footprints resulting from animal production. All these aspects point out important concepts under the principles of circular economy and resilience enhancement in livestock farming, namely, making the most of resources to build a regenerative food system.

The Effects of Fermented Cauliflower Residue Feed on the Diarrhea Rate, Intestinal Morphology, Immune Indicators, and Intestinal Flora of Weaned Piglets

This study investigated the effects of incorporating fermented feed into the post-weaning piglet diet, with a focus on its impact on the growth, health, serum markers, immune function, diarrhea rate, and microbial community of post-weaning piglets. Forty-two post-weaning piglets (Duroc × [Landrace × Yorkshire], castrated male), with good health and similar weight (11.40 ± 1.36 kg) at 40 days of age, were randomly assigned to two groups. Throughout the trial, one group received a standard diet (control group) while the other one was given a diet supplemented with fermented feed (experimental group), respectively. The findings revealed that compared to the control group, the post-weaning piglets fed with fermented feed showed increased daily weight gain. The fermented feed also led to an increase in the height of villi in the duodenum or jejunum of post-weaning piglets (p &lt; 0.05), accompanied by an improved ratio of villus height to crypt depth in the experimental group (p &lt; 0.05). Furthermore, the fermented feed enhanced the richness and diversity of the intestinal microbial community in post-weaning piglets (p &lt; 0.05), particularly increasing the relative abundance of Lactobacillaceae and Bifidobacteriaceae. These findings demonstrate that incorporating the fermented feed into the diet can reduce the diarrhea rate, improve growth performance, enhance immune function, and promote intestinal development in post-weaning piglets.

Terminalia Chebula Extract Replacing Zinc Oxide Enhances Antioxidant and Anti-Inflammatory Capabilities, Improves Growth Performance, and Promotes Intestinal Health in Weaned Piglets.

This study aimed to assess the effects of substituting zinc oxide with terminalia chebula extract (TCE) on growth performance, antioxidant capacity, immune function, and intestinal health in weaned pigs. Initially, 72 weaned Duroc × Landrace × Large White piglets, 28 days old with an initial weight of 7.43 ± 0.14 kg, equally divided by gender, were randomly assigned into three groups, with six replicates and four piglets per replicate. They were fed a basal diet (CON group), a diet containing 2 g/kg zinc oxide (ZnO group), or 2 g/kg TCE (TCE group) for a duration of 28 days. Subsequently, to further confirm the most appropriate levels of TCE in piglets, 96 piglets of the same breeds and age, with an initial weight of 7.42 ± 0.12 kg, also equally divided by gender, were randomly assigned into four groups, each with six replicates and four piglets per replicate, and fed a basal diet (CON group), or diets supplemented with 1 g/kg TCE (LTCE group), 2 g/kg TCE (MTCE group), or 4 g/kg TCE (HTCE group) for a duration of 28 days. The results demonstrated that both TCE and ZnO reduced diarrhea rates (p = 0.001) and enhanced average daily gain (ADG) (p = 0.014) compared to the control group. TCE at 1 g/kg and 4 g/kg reduced the feed to gain ratio (p = 0.050). Dietary supplementing with TCE and ZnO increased serum total antioxidant capacity (T-AOC) (p = 0.020). Various doses of TCE also increased jejunal IgA (p = 0.000) levels and IL-10 expression (p = 0.004), and decreased the levels of TNF-α in both serum (p = 0.043) and jejunal mucosa (p = 0.000). Notably, TCE reduced the crypt depth (CD) of the duodenal (p = 0.007) and increased the villus height (VH) of the ileal (p = 0.045), and with increased dosage, there was a rise in the villus height to crypt depth ratio (VH:CD) in the duodenum (p = 0.000) and jejunum (p = 0.001). Higher abundances of Lactobacillaceae (p = 0.000) and lower levels of Streptococcaceae (p = 0.000) and Peptostreptococcaceae (p = 0.035) in cecal contents were fed the ZnO and TCE pigs compared with CON pigs. Therefore, TCE was firstly presented as being able to replace zinc oxide, improve intestinal morphology, and enhance antioxidant and immune functions, thus safeguarding intestinal mucosal health and promoting piglet growth.

186 Evaluating the interaction between divergent genomic selection for heat stress tolerance in the F1 generation and in utero heat stress on piglet growth performance following weaning and transport

186 Evaluating the interaction between divergent genomic selection for heat stress tolerance in the F1 generation and in utero heat stress on piglet growth performance following weaning and transport

Lysine requirement of weaned piglets

Lysine, often referred to as the ‘first limiting amino acid’ in pig nutrition, plays a pivotal role in growth performance. Variability in lysine requirements arises due to factors such as age, sex and environmental conditions. Optimising pig health and production efficiency and minimising nitrogen excretion require accurate knowledge of estimated lysine requirements accounting for factors such as genetics, feeding practices, scientific advancements, and environmental considerations. This study aimed to determine standardised ileal digestible (SID) lysine requirements of weaned piglets (5–30 kg) based on a literature review using meta-analytical approaches. The literature review yielded 344 studies that were screened for title and abstract. In total, 41 experiments met the inclusion criteria, resulting in a dataset of 206 treatment means. Linear, quadratic and linear-plateau models were used to gain insight into the effect of SID lysine addition on average daily gain and feed efficiency for the combined dataset and separately for the individual experiments. Regression analysis showed a predominant linear increase in average daily gain and feed efficiency as an overall response to increasing lysine levels across both the combined dataset and individual experiments. Breakpoint estimation from the linear-plateau models was inconclusive, indicating that the optimal SID lysine requirement to maximise piglet growth performance likely exceeded the upper lysine levels tested in most studies, thus surpassing 1.3 g SID lysine per MJ net energy. This review indicates high values for the lysine requirement to achieve maximum growth performance. Results may suggest that piglet feed formulation should focus on an optimal dietary SID lysine to CP ratio, rather than SID lysine per kg of diet or unit of net energy. However, more research is needed to investigate this suggestion.

Ningxiang Pig-Derived Parabacteroides distasonis HNAU0205 Alleviates ETEC-Induced Intestinal Apoptosis, Oxidative Damage, and Inflammation in Piglets.

Weaning is a critical stage in the growth and development of piglets, often inducing stress reactions. This study aims to investigate the effects of Parabacteroides distasonis (PBd) derived from Ningxiang pigs on growth performance, intestinal apoptosis, oxidative damage, and inflammation in ETEC-challenged weaned piglets. A total of 22 Duroc × Landrace × Yorkshire (DLY) piglets, 24 days old with similar body weights, were randomly divided into three groups: Control (n = 7), ETEC (n = 7), and PBd + ETEC (n = 8). The results show that, compared to the Control group, ETEC challenge led to decreased growth performance, reduced villus height in the duodenum and jejunum, increased crypt depth in the duodenum, a decreased villus-height-to-crypt-depth ratio, increased expression of apoptosis-related genes (Caspase-8 and Caspase-9), increased expression of oxidative damage-related genes (Nrf2, GSH-PX, mTOR, and Beclin1), increased expression of inflammation-related genes (Myd88, P65, TNF-α, and IL-6), and reduced the contents of SCFAs in the colonic chyme (acetate, propionate, butyrate, valerate, and total SCFAs). Compared to the ETEC group, the PBd + ETEC group alleviated the reduction in growth performance, mitigated intestinal morphological damage, and reduced the expression of the aforementioned apoptosis, oxidative damage, and inflammation-related genes with the increase in SCFAs. In conclusion, PBd derived from Ningxiang pigs effectively reduces ETEC-induced intestinal damage in weaned piglets, improves intestinal health, and increases the content of SCFAs in the colonic chyme, thereby enhancing growth performance.

Effect of the supplementation of N-acetylglutamate and patchouli extract on piglets fed on a low protein diet

The livestock industry faces challenges such as limited protein feed resources, suboptimal nitrogen utilization efficiency, and environmental impacts. Reducing the crude protein content in piglet diets has been shown to alleviate these issues, offering benefits to both animal welfare and environmental sustainability. However, low-protein (LP) diets can negatively affect piglet health and growth, necessitating strategies to mitigate these effects. The study aimed to explore the effects of supplementing LP diets with N-acetylglutamate (NAG) and Patchouli (PTC) on the health and growth of weaned piglets, focusing on growth metrics, antioxidant capabilities, intestinal barrier integrity, and inflammatory response. One hundred twenty healthy piglets were randomly assigned to five dietary groups, including a standard control diet (CON), an LP diet, and LP diets supplemented with NAG, PTC, or both. The trial lasted four weeks, and the piglets' growth, immune response, antioxidant status, and intestinal health were assessed. Piglets on the LP diet had lower final body weights and average daily weight gains. However, supplementation with NAG and PTC improved antioxidant defense, reduced inflammation, and enhanced intestinal health, as evidenced by increased VEGF-A expression in the small intestine epithelium (p < 0.05). The addition of NAG and PTC to LP diets can improve the health and growth of weaned piglets, suggesting a potential strategy for managing the challenges associated with LP diets. This research provides valuable insights for the livestock industry, indicating that the use of natural additives like NAG and PTC can help maintain piglet health and growth while reducing the environmental impact of high-protein diets. Further research is needed to optimize these strategies for widespread application.

Dietary Citrus Flavonoids Improved Growth Performance and Intestinal Microbiota of Weaned Piglets via Immune Function Mediated by TLR2/NF-κB Signaling Pathway.

This study investigated the effects of citrus flavonoids (CF) and compared to antibiotics on piglet growth and gut health. Weaned piglets were fed either a basal diet (CON) or a basal diet supplemented with 75 mg/kg chlortetracycline (CTC), 20 mg/kg CF (CF1), 40 mg/kg CF (CF2), or 80 mg/kg CF (CF3). The CF group, especially CF3, exhibited improved growth performance; reduced diarrhea; significantly higher levels of serum growth factors, immunoglobulins, and anti-inflammatory cytokines; and significantly lower levels of pro-inflammatory factors and markers of intestinal barrier damage (P < 0.05). The intestinal mucosa proteins ZO-1 and occludin increased, while NF-κB and TLR2 decreased, correlating with CF dosage (P < 0.05). Furthermore, CF promoted a favorable balance in the gut microbiota, with an increased relative abundance of Bacteroidetes and Prevotella and decreased taxa Tenericutes and Clostridiales. Overall, CF enhanced piglet growth and gut health by modulating the TLR2/NF-κB pathway, offering a natural antibiotic alternative. The optimal dose of CF was 80 mg/kg.

The effect of vaccination of gilts with a pre-farrow RNA particle vaccine following pre-breeding natural planned exposure on piglet growth and viral shedding

The objective of this study was to compare rotavirus shedding and performance of piglets from gilts immunized using natural planned exposure (NPE) or an RNA particle vaccine (RPV) prior to farrowing following initial NPE pre-breeding. A final total of 117 farrowed gilts and their piglets were enrolled into 4 groups. All gilts received two administrations of NPE prior to breeding. Gilts in group 1 were later given three NPE administrations at 5, 4, and 3 weeks prior to farrowing (WPF). Group 2 was dosed with an RNA particle vaccine (RPV) at 5 and 3 WPF and group 3 at 1 WPF only. Group 4 (control group) did not receive any NPE or RPV. Fecal samples from gilts and fecal swabs from their piglets were tested for rotavirus A (RVA), rotavirus B (RVB), and rotavirus C (RVC) by qRT-PCR. The 117 gilt samples were tested individually at 5 sampling points from pre-breeding to entry into the farrowing rooms. Piglet samples were pooled by litter (3 piglets sampled per litter) and tested at 3, 7, 14, and 21 days of age. The clinical and production impact of the treatments were assessed by comparing average adjusted weaning weights, the percentage of piglets weighing in the bottom 10% of study piglets at weaning, the percentage of piglets placed in the nursery, and the percentage of litters with the presence of diarrhea. No statistically significant differences were identified but there appeared to be several interesting numerical trends that are both biologically plausible and consistent among treatment groups. The control group, which received no pre-farrow immunization, had the highest percentage of litters with diarrhea at all time points and overall in the farrowing house. A numerical trend was also observed on average cycle threshold (Ct) values for RVC in piglets. Interestingly, the control group had the lowest numerical average Ct value at 7, 14, and 21 days of age. Ct values for RVA were consistently lower than for RVC in the stock solution and natural planned exposure gruel. This likely correlated to a lower level of RVC exposure in all gilts pre-breeding and group 1 gilts pre-farrow. This may have an inverse correlation to the higher levels of shedding of RVC in piglets. The lack of statistical significance between treatment groups with regard to diarrhea and weights in the piglets may be attributed to sample size, lack of sufficient natural rotavirus challenge, pre-breeding NPE in all gilts, or a variety of other reasons. Replication of this study with a larger sample size, using a challenge model, or relocated to a farm with increased natural rotavirus clinical challenges may yield different results. If beneficial under different conditions, the RPV would eliminate many of the risks associated with NPE administration, including continuous introduction of live virus on-farm, potential spread of other pathogens, difficulty of isolating on-farm strains, and labor and cost of producing NPE material. Limitations of the original research include the use of quantitative reverse transcriptase-polymerase chain reaction (qRT-PCR) to measure the levels of RVA and RVC in the stock solution and gruel and to monitor RV shedding, rather than techniques with the ability to differentiate live and non-viable virus. Additionally, these studies were performed on an all-gilt breeding farm. It may be more challenging to appreciate differences in treatment groups on a multiparous sow farm due to the higher level of immunity correlated to increasing parity. These immunization protocols were designed to be applicable in a field setting for routine rotavirus immunization, though their feasibility must be carefully considered before implementation on each individual farm.

Bamboo fiber improves piglet growth performance by regulating the microbial composition of lactating sows and their offspring piglets.

Feeding bamboo powder is a kind of fiber raw material mainly composed of insoluble dietary fiber (IDF). In this study, IDF-based rice husk meal and feeding bamboo powder were used to compare the effects of bamboo fiber on fecal microflora and the performance of lactating sows and their offspring piglets. Thirty healthy crossbred gilts (Yorkshire × Landrace) at day 105 of gestation were randomly allocated into three groups: CON, TRE1 supplemented with 2% BBF1 (feeding bamboo powder), and TRE2 supplemented with 2% BBF2 (99% feeding bamboo powder +1% bamboo fiber polymer material). The reproductive performance, serum indexes, and fecal microbiota of sows and piglets were analyzed. The results showed that, compared with CON, the average feed intake of sows in TRE1 during the second week of lactation was significantly increased by 21.96% (p < 0.05), the average daily gain (ADG) per litter in TRE1 on 11-21 days and 3-21 days of lactation was significantly increased by 50.68 and 31.61%, respectively (p < 0.05), and the serum triglyceride content of sows in TRE1 on the 21st day of lactation was significantly increased (p < 0.05). The 16S rRNA analysis showed that dietary bamboo fiber significantly increased the fecal microbial richness index Ace, Chao, and Sobs of sows (p < 0.05) and tended to increase the Sobs index of suckling piglets on day 21 (p < 0.10). Compared with CON, BBF1 supplementation significantly decreased the abundance of Christensenellaceae_R-7_group in feces of sows on days 7 and 21 after delivery (p < 0.05), while BBF2 decreased the genera Christensenellaceae_R-7_group on days 7 (p < 0.10) and 21 (p < 0.05) after delivery. Spearman correlation analysis showed that the abundance of Phascolarctobacterium in the feces of piglets on the 21st day after delivery was significantly positively correlated with diarrhea rate and significantly negatively correlated with ADG per litter, day 21 litter weight, and 3- to 21-day survival rate. In contrast, Christensenellaceae_R-7_group was significantly negatively correlated with diarrhea rate and positively correlated with ADG per litter. These results indicated that maternal BBF1 supplementation improved the litter weight gain of suckling piglets, which was associated with the improvement of diversity and structure of the fecal microbiota in the piglets.