Feeding Regime Research Articles

Influence of Different Lighting and Feeding Regimes on the Expression of the Fadsd5, Fadsd6, Elovl2, and Elovl5a Desaturase and Elongase Genes in the Liver of Juvenile Atlantic Salmon Salmo salar L. under Aquaculture Conditions

Influence of Different Lighting and Feeding Regimes on the Expression of the Fadsd5, Fadsd6, Elovl2, and Elovl5a Desaturase and Elongase Genes in the Liver of Juvenile Atlantic Salmon Salmo salar L. under Aquaculture Conditions

Use of zoohumus extracts in soybean cultivation under regulated agroecosystem conditions

A model experiment was conducted in the laboratory conditions of the climate chamber to study the effect of liquid extract of black soldier fly zoohumus prepared in different ways on the growth rates and germination of seeds of the early ripening soybean variety EN Argenta. The zoohumus suspension was used in all variants at a dose of 0.2% (2000 ppm). As an additional background, a complex fertilizer containing the necessary plant nutrients in the form of various mineral salts was added. Analysis of the experimental data showed that the highest percentage of plant germination was recorded in the variant with the introduced aqueous suspension of zoohumus without centrifugation and without sterilization, and amounted to 94%. Against the background of pure organic matter, an increase in shoot biomass by an average of 22% was recorded. However, here the variant with sterilization, but without centrifugation of the zoohumus suspension, stood out. Against the background of the organomineral environment, the weight and height of the plants were higher, but stagnation in growth was noted, probably due to oversaturation in the feeding regime and the formation of chelate complexes of prolonged absorption. Thus, an aqueous suspension of zoohumus obtained by sterilization without additional centrifugation is the best way to prepare samples of raw materials for further use in sterile experiments. Centrifugation reduces the amount of enzymes and nutritional compounds, which negatively affects the quality of the suspension, and additional sterilization releases an additional amount of low-molecular compounds into the environment, which can feed microorganisms.

Comparative growth performance of Nile tilapia (Oreochromis niloticus) sex groups intank culture: A hormone-free approach for sustainable aquaculture in Dodoma, Tanzania

Male tilapia are globally preferred in aquaculture for their superior growth and uniform harvest sizes. However, hormonal sex reversal techniques used to produce all-male populations can pose health and environmental risks. This study investigated the growth performance of manually separated monosex males, monosex females, and mixed-sex groups of Nile tilapia in tank culture as a sustainable and hormone-free alternative. Over six weeks, the study measured various morphometric parameters, weight gain, specific growth rates, water quality parameters, and condition factors. The fish were fed isonitrogenous commercial feed, and the feeding regime was adjusted based on their weight. Results revealed that monosex tilapia groups attained higher growth rates than mixed-sex groups, with males achieving an average final weight of 56.5 g, followed by females at 53.3 g, and mixed-sex groups at 43.3 g. Males had higher morphometric values compared to females and mixed-sex groups. The water quality parameters remained optimal across all groups, indicating that sex composition does not impact water management. Monosex females and mixed-sex groups exhibited better condition factors. The study concludes that tilapia farming can be effectively conducted with either mono-sex male or mono-sex female tilapia, as their growth rates do not differ significantly. Further research and development of techniques to ease the separation of sexes and enhance the growth rates of monosex female tilapia are recommended as a viable, hormone-free alternative for sustainable aquaculture.

Comparative demography of two wild cladoceran species, Alona quadrangularis and Scapholeberis mucronata, collected in western Washington state and reared under laboratory conditions

AbstractPopulations of two cladoceran species, Alona quadrangularis and Scapholeberis mucronata, were collected from a pond in Puyallup, Washington, and reared under controlled laboratory conditions. Life tables were developed for each species under the same environmental conditions and feeding regimen to develop basic demographic data. We also compared the major demographic parameters of these two wild species with those of several cladoceran species that are commonly used in laboratory research, Daphnia pulex, D. magna, and Ceriodaphnia dubia. Compared to A. quadrangularis, S. mucronata had a much higher net reproductive rate (R0), a longer generation time (T), but a similar intrinsic rate of increase (rm), similar finite rate of increase, similar doubling time (DT), and a lower birth rate (b). Both wild species had lower R0, shorter T, and higher b than in D. pulex, D. magna, and C. dubia. Results of this study showed that demographic rates differed between A. quadrangularis and S. mucronata, and differed from those reported for the other three laboratory species. These results suggest that data developed for commonly used cladoceran species in the laboratory should not be used to make generalizations about effects on wild species.

Suitability of Monospecific and Mixed Microalgal Diets for Spat of the Silver‐Lip Pearl Oyster Pinctada maxima

ABSTRACTExpansion of pearl production using the silver‐lip pearl oyster, Pinctada maxima, depends on increasing the availability of high‐quality spat from hatcheries and optimization of existing hatchery protocols. Research to develop feeding regimes yielding higher quality spat is seen as a priority. This study evaluated the suitability of three microalgae (Rebecca salina, Chaetoceros simplex and Tisochrysis lutea), fed singly and in combination, for spat of P. maxima and assessed whether mixed diets yielded spat of higher quality. A model‐fitting approach examined the response of spat fed microalgal diets for 35 days. Organic content of spat, as an indicator of quality, as well as metrics relating to spat size and weight were considered. On the basis of organic content, all microalgal diets tested were found suitable and there was no evidence that the mixed diets yielded higher quality spat compared to monospecific diets. Further, any gains in spat size attributed to the mixed microalgal diets were comparatively modest. Contrary to long‐held assumptions, our results indicate that monospecific microalgal diets are not necessarily inferior to mixed microalgal diets for on‐growing spat of P. maxima. They indicate potential to develop simpler and cheaper protocols for culture of P. maxima spat in land‐based systems.

Application of stable isotopes and mineral elements fingerprinting for beef traceability and authenticity in inner mongolia of China

In recent years, the origin and safety of counterfeit meat products have raised significant concerns among consumers. Therefore, there was an urgent need to develop a new method using fingerprinting techniques for meat product traceability. This study aimed to evaluate the traceability and authenticity of beef from Inner Mongolia by measuring the δ13C and δ15N values, as well as 13 mineral elements. In the complex environment of feeding regimes and agricultural types, δ15N, δ13C, and Se were selected as characteristic variables to differentiate feeding regimes, while Fe, K, Tl, Sr, Mn, and δ13C were chosen as characteristic variables for tracing the origin of the beef. Linear discriminant analysis achieved an accuracy rate of up to 100 %. This research confirmed the effectiveness of combining stable isotopes with mineral elements in accurately determining the origin of Inner Mongolian beef and verifying the authenticity of typical feed, providing a valuable strategy for traceability.

Mediterranean Aquaponics: Fasting and Refeeding in a Polyculture Aquaponic System

The use of Mediterranean euryhaline fish and halophytes in aquaponics presents a sustainable and alternative approach to food production. The present study investigates the effect of compensatory growth on sea bass (Dicentrarchus labrax) and Baltic prawn (Palaemon adspersus) co-cultivated with the halophytic glasswort (Salicornia europaea). Three autonomous systems were established, each containing forty-five sea bass, nine Baltic prawns, and eight glasswort plants, with different feeding regimes for each treatment: (i) daily feeding (treatment A), (ii) three days of feeding per week followed by four days of fasting (treatment B), and (iii) feeding for seven days followed by seven days of fasting (treatment C). The growth performance of the fish was significantly higher in treatment B. Conversely, the feed conversion ratio (FCR) was notably higher in treatment A. As for the prawns, their final body weight and length were similar across all treatments. The glasswort plants also demonstrated significantly improved growth in treatment B. These results indicate that the incorporation of feeding and fasting cycles can be an effective feed management strategy for polyculture aquaponic systems. Additionally, food deprivation had a positive impact on the growth performance of both glasswort and prawns.

Necrotizing enterocolitis following spontaneous intestinal perforation in very low birth weight neonates.

Necrotizing enterocolitis (NEC) and spontaneous intestinal perforation (SIP) are severe gastrointestinal complications of prematurity. The clinical presentation and treatment of NEC and SIP (peritoneal drain vs laparotomy) can overlap; however, the pathogenesis is distinct. Therefore, a patient initially treated for SIP can subsequently develop NEC. This phenomenon has only been described in case reports, and no risk factor evaluation exists. We evaluate clinical characteristics, risk factors, and outcomes of patients treated for a distinct episode of NEC after SIP. We performed a retrospective review of very low birth weight (<1500 g) neonates who presented with pneumoperitoneum between 07/2004 and 09/2022. Data was obtained from two separate neonatal intensive care units that were part of the same institution. Patients with an initial preoperative, intraoperative, or pathological diagnosis of NEC were excluded. Patients with an intraoperative diagnosis of SIP or preoperative diagnosis of SIP successfully treated with a peritoneal drain (PD) were evaluated. Patients subsequently treated (medically or surgically) for NEC after SIP were then compared to SIP-alone patients. Clinical characteristics included demographics, gestational age (GA), birth weight (BW), perinatal risk factors (chorioamnionitis, steroids, indomethacin), postoperative feeding regimen, and length of stay (LOS) were compared. Of the 278 patients included, 31 (11.2%) patients had NEC after SIP. There was no difference in GA (25 weeks vs 25 weeks, p = 0.933) or BW (760 g vs 735 g, p = 0.370) between NEC after SIP vs SIP alone cohorts, respectively. Twenty (64%) of NEC after-SIP patients were previously treated with LP. NEC after SIP occurred with a median onset of 56 days. Pneumatosis was the most frequent (81%) presenting symptom and 12 (39%) patients had hematochezia. Four (12.9%) patients required LP for NEC and all had NEC intraoperatively and on pathology. A majority (77.4%) of patients were on breast milk (BM) at time of NEC diagnosis. NEC after SIP patients had lower maternal age at delivery (29.0 vs 25.0, p = 0.055) and the incidence of NEC after LP (primary or failed drain) was higher than PD alone (16.7% vs 6.2%, p = 0.007). NEC after SIP patients had longer LOS (135 vs 81, p < 0.001). We report an 11.2% incidence of NEC at a median of 56 days following successful treatment of SIP, resulting in increased LOS. SIP patients are a high-risk cohort and protocols to prevent this phenomenon should be investigated.

The effect of laboratory diet and feeding on growth parameters in juvenile zebrafish

Despite being one of the most used laboratory species in biomedical, behavioral and physiological research, the nutritional requirements of zebrafish (Danio rerio) are poorly understood, and no standardized laboratory diet exists. Diet and feeding regimen can substantially impact the welfare of the fish and, in turn, experimental reproducibility. Consequently, the establishment of a standardized diet and feeding protocol for laboratory zebrafish is imperative to enhance animal welfare, guarantee research reproducibility and advance the economic and environmental sustainability of laboratory dietary practices. Here the aim of this systematic review is to provide an overview of the parameters that need to be standardized in future nutritional studies to facilitate future meta-analyses for confirmation of an optimal juvenile diet for growth. A comprehensive search was conducted in PubMed and Scopus to identify relevant studies published up to August 2023, and the studies were selected on the basis of the predefined inclusion/exclusion criteria. The databases yielded a total of 1,065 articles, of which 14 were included in this review. We conducted data extraction and risk-of-bias analysis in the included studies. Statistical comparisons for specific growth rate, weight gain (%) and length gain (%) parameters were performed to determine the optimal feed for enhanced juvenile growth. We identified significant heterogeneity and caveats to our findings owing to a lack of standardization of experimental conditions in nutritional studies. Our findings highlight an urgent need for research on zebrafish nutrition. Therefore, the standardized parameters we have reported here represent a critical starting point for studies.

A method for differentiating the meat of meat-producing animals into quality groups based on measuring the amount of free (crystallizing) water

The problem of identifying meat by quality groups is a crucial task. Various feeding regimes, type of meatproducing animals, cuts, and method and duration of meat storage before sale have a signifi cant impact on its categorization. In the Russian Federation, the meat of meat-producing animals is usually divided into 3 main groups according to quality: NOR — normal quality, with normal post-mortem autolysis, and PSE and DFD —with abnormal autolysis. The research has established that, to a large extent, the classification of meat into one of these groups is associated with the state of intramuscular moisture. The presence of free moisture not associated with hydration shells gives the meat low consumer qualities. As a result of the research, it has been proposed to estimate the amount of free and bound water using the thermal effects that occur when freezing meat. Free water undergoing fi rst-order phase transitions during the freezing process releases latent heat of crystal formation. Based on the amount of such heat, it is proposed to estimate the amount of free water and, accordingly, classify a given batch of meat into one or another quality group. A method and equation for calculating the amount of free (crystallizing) water in meat is proposed. The technique can be used for commodity assessment of the suitability of a specific batch of meat, including for customs control purposes and in the development of specialized diets.

The Effect of Parasitization by Trichodinid Ciliates on the Mortality of Cultured Pacific Fat Sleeper larvae (Dormitator latifrons).

Trichodinidae, a prevalent group of protozoan ectoparasites in aquaculture, cause rapid mortality in fish hatcheries. Despite their significance, knowledge about these parasites in farmed fish in South America, especially in native species that are currently being domesticated for aquaculture, remains limited. This study morphologically characterized the Trichodinid species that are infecting Pacific fat sleeper (Dormitator latifrons) larvae and evaluated their impact on larval rearing. Four pairs of broodstock were induced with GnRHA implants and placed in tanks containing 200 L of freshwater, with a water temperature of 28 ± 1.0 °C and a dissolved oxygen level of 4.00 ± 1.23 mg L-1, with partial water exchanges being performed daily. The larvae hatched 7 to 8 h after fertilization and were transferred to tanks containing water with the same quality parameters. Twelve hours post-hatching, the presence of Trichodina was observed. Every 24 h, 60 larvae per tank (n = 180 per treatment) were sedated, and larval wet mounts were prepared, air-dried at room temperature, and impregnated with silver nitrate. Infection parameters and daily mortality were calculated. Trichodina was observed to parasitize the pelvic fins, caudal fins, and heads of fish larvae, which showed lethargy and erratic swimming movements. The Trichodina species showed a daily increase in the infection parameters, and a 58% rate of larval mortality was observed at the fourth day post-hatching (dph) in the infected tanks. In captivity, D. latifrons larvae typically survive up to 7 days post-hatching (dph) before reaching their point of no return due to the lack of adequate diet and feeding regimes. However, our study indicates that Trichodina infestation accelerates mortality, causing infected larvae to die more quickly than uninfected ones.

The impact of an enteral formula with food-derived ingredients on dietetic practice at a specialist children's hospital in the UK: Retrospective study.

Blended tube feeds are reported to be better tolerated in some children compared to standard commercial enteral formulas, allowing children to normalise feeding by having similar foods as the rest of the family. However, a blended tube feed is contraindicated in patients who are immunocompromised or require post-pyloric feeding as a result of a food safety risk. Other contraindications for blended diet include children who require continuous pump feeding via gastrostomy or nasogastric feeding tube (< 12 Fr) and fluid restrictions. To meet the demands of consumers, manufacturers have developed enteral formulas with food-derived ingredients (EFI). Commercially available EFIs are relatively novel in the UK. The present study aimed to monitor the implementation of an EFI by dietitians in a specialist children's hospital. A single-centre retrospective study was conducted to monitor the dietetic practice of commencing a commercially available EFI (Compleat® paediatric; Nestlé Health Science; 1.2 kcal/ml with 14% food-derived ingredients). Using electronic medical notes, data were collected on all children who commenced an EFI via an enteral feeding tube in a specialist paediatric hospital between August 2022 and December 2023. Data were gathered on demographics (age, sex and primary diagnosis), anthropometric measurements (weight-for-age Z-score and height-for-age Z-score), feed regimens (feed volume, feeding route, mode of feeding [continuous, bolus]), gastrointestinal symptoms (gastro-oesophageal reflux, vomiting, abdominal discomfort, constipation and loose stools) and geographical discharge area for children on home enteral nutrition. Seventy children were included in the analysis. The mean ± SD age was 4.7 ± 6 years. The median admission weight-for-age Z-score was -1.50. The most common primary diagnosis was a neurological impairment in 37/70 (47%) children. Most children were fed via a percutaneous endoscopic gastrostomy 31/70 (44%) and 8/70 (11%) of the children fed directly into the jejunum. The most common reason being gastrointestinal symptoms, 58/70 (83%). The most common gastrointestinal symptom reported before commencing an EFI was loose stools in 22/58 (38%) children. Within 7 days of commencing an EFI, there was reported improvement in gastrointestinal symptoms in all categories. In total, 42/70 children were discharged on an EFI. In our specialist children's hospital, EFI is primarily implemented by dietitians in children who are already established on an enteral formula displaying gastrointestinal symptoms. However, dietitians are increasingly implementing an EFI as their first-line whole protein enteral formula. Furthermore, an EFI was also implemented as a compromise to a blended diet.

Beneficial effects of AMP Scy-hepc on the gut microbiota contribute to the potential growth of Larimichthys crocea

BackgroundIn light of the global ban on antibiotics in animal feed, antimicrobial peptides (AMPs) have emerged as a compelling substitute, garnering considerable interest for their potential as feed additives. Our previous study revealed that the extended (one-year) daily administration of the AMP Scy-hepc substantially boosted the growth of Larimichthys crocea. However, the exact influence of dietary supplementation with AMPs on the gut microbiota and the potential beneficial mechanisms remain unclear. Inspired by this, the present study endeavors to examine the alterations in gut microbiota at various gut sites in L. crocea following a 60-day Scy-hepc feeding regimen, building upon our prior research efforts.ResultsUtilizing 16S rRNA sequencing, we found that dietary supplementation with Scy-hepc significantly promoted the growth of L. crocea, which may be caused by the remarkable changes in the microbial communities within the foregut and midgut. Notable changes were observed in Tenericutes, Firmicutes, Proteobacteria, Cyanobacteria and Spirochaetes. The bacterial load trends in both the foregut and midgut demonstrated a notable increase following a 60-day Scy-hepc feeding, as determined by absolute quantitative PCR analysis. Moreover, Scy-hepc supplementation increased the abundance of potential probiotics (Rhodobiaceae and Planococcaceae) and reduced the abundance of opportunistic pathogens (Flavobacteriia and Mollicutes). This led to a more intricate microbial network with enhanced metabolism-related functions, especially in lipid transport and metabolism, signal transduction mechanisms, and coenzyme transport and metabolism. And the microbial resistance (Rs) exhibits no significant change between the Scy-hepc and control groups, indicating a minimal level of toxicity to the gut microbiota of L. crocea.ConclusionsIn summary, this study provides compelling evidences supporting the beneficial alteration of gut microbiota in the foregut and midgut as an underlying mechanism by which Scy-hepc feeding promotes host growth. These findings offer a novel perspective for investigating the advantageous effects of AMPs on fish health and the advancement of aquaculture.

From wild to captive: Understanding the main nutritional diseases of sharks in public aquariums.

The establishment of a well-adapted and accurate feeding regimen is a fundamental determining factor in the maintenance of shark species in captivity. Replicating the natural diet in captivity is commonly accepted and recommended. Given the diverse nutritional composition of prey, supplementation may become necessary. The captive environment poses unique challenges, making sharks susceptible to an array of health issues, including numerous diseases. Mitigating these risks demands detailed husbandry practices, an appropriate physical environment and a balanced diet. Supplementation, encompassing vitamins and minerals, becomes imperative for the provision of essential nutrients. This complexity has rendered the formulation of an adapted feeding plan for aquarists exceptionally challenging. The scarcity of information in these species adds to the issue, mandating extrapolation from various shark groups and to species with analogous characteristics. This literature review concentrates predominantly on benthic and pelagic shark species prevalent in contemporary aquariums. The central argument posits that dietary choices in captivity rely on factors such as availability, quality and consistency of supply. The advocated approach highlights the importance of a balanced, diverse feeding that closely mirrors natural diets. It is then crucial to emphasize that these are general guidelines, and the specific dietary requisites may diverge between shark species. Collaborating with experts in marine biology, shark husbandry and veterinary care is imperative for the formulation and perpetuation of an adapted diet for captive sharks.

Neuropathologic Findings and Electrolyte Abnormalities in a Case of Lennox-Gastaut Syndrome (SCN2a- related) Encountered at Autopsy

Abstract Introduction/Objective Lennox-Gastaut syndrome is a severe form of childhood epilepsy which may be due to several conditions, including sodium channelopathies which alter neuronal firing patterns. We present a case of a 6-year-old female with Lennox-Gastaut syndrome (SCN2A-related) complicated by developmental delay, spastic quadriplegia, and gastrojejunostomy tube dependence who was referred for medicolegal autopsy due to death subsequent to becoming unresponsive during a supervised bath. Methods/Case Report A complete autopsy was performed, including gross and microscopic examination of all primary organ systems, formal neuropathologic examination, and postmortem microbiology, toxicology, and vitreous electrolyte studies. The decedent showed evidence of developmental delay and flexion contractures of the extremities. No significant traumatic injuries were identified. A postmortem nasopharyngeal swab was positive for Rhinovirus/Enterovirus and Influenza A H3. A postmortem vitreous electrolyte panel demonstrated a dehydration pattern, including markedly elevated sodium and chloride and elevated urea nitrogen. Gross examination of the brain showed a thin corpus callosum, small hippocampi, as well as abnormal cerebellar dentate and inferior olivary nuclei. Microscopic examination of the brain tissue supported the gross findings, including dentato-olivary dysplasia. The cause of death was certified as dehydration complicating Lennox-Gastaut syndrome (SCN2a-related). Rhinovirus/Enterovirus and Influenza A H3 infections were considered contributory to death. The manner of death remained undetermined, since it was unknown if the decedent’s natural diseases, issues following a scheduled gastrojejunostomy feeding regimen, neglect, or some combination thereof caused the dehydration. Results (if a Case Study enter NA) NA Conclusion This case highlights unique and rarely documented neuropathologic findings and electrolyte abnormalities that may be seen in Lennox-Gastaut syndrome associated with an SCN2A mutation in addition to demonstrating the challenges of cause and manner death certification in cases of severe developmental disorders of childhood related to sodium channelopathies.

Sustainable dairy farming and fipronil risk in circular feeds: insights from an Italian case study

Circular feeds, such as grain dry distillers, citrus pulp, cane molasses, and potatoes peels, are co-products of biomass processes. They are currently proposed in animal nutrition to improve the environmental and economic sustainability of the food production chain. In this paper, we report a case study involving fipronil, a pesticide currently not authorized for agriculture within the EU, but used in the Americas, Eastern Europe, and Asia. Fipronil was found at a mean level of 0.49 mg/kg, in a grain dry distiller batch administered to dairy cows. This finding, along with other evidence of potential fipronil presence in feed materials, prompted us to evaluate the risk to food safety and food security from 12 different conventional and sustainable feeding regimens. To this purpose, we considered a fipronil feed-to-milk carry-over rate of 0.52, the tolerance levels in fodders and food from The EU, Codex Alimentarius, and US-EPA, and the Acceptable Daily Intake (ADI) of 0.0002 mg/kg body weight for adverse effects on thyroid function in dairy cows. Under a conservative scenario, fipronil-contaminated potato peels and grain distillers in the feeding regimens may play a pivotal role in exceeding the EU Maximum Residue Level (MRL) in bovine milk and fat (0.005 and 0.030 mg/kg, respectively). Hay-based diets with soybean hulls and cane molasses show negligible risks (Hazard Index ∼ 1). In all cases, the ADI exceedance suggests the need to evaluate thyroid function in dairy cows exposed to fipronil as a food security factor.

Comparative analysis of features extraction protocols for LC-HRMS untargeted metabolomics in mountain cheese ‘identitation’

This study presents a comprehensive metabolomic analysis of Parmigiano Reggiano samples to differentiate between those designated as Mountain Quality Certification (QC) and conventional Protected Designation of Origin (PDO). Despite following the same production protocol, these cheese varieties differ in the cows’ feeding regimes and milk stable locations, with mountain-certified samples adhering to specific requirements regarding milk origin and feed composition. An untargeted approach with Liquid Chromatography-High Resolution Mass Spectrometry (LC-HRMS) was proposed to characterize the cheese metabolome. High-resolution LC-MS data can generate gigabyte-sized files, making data compression essential for manageable multivariate analysis and noise reduction. This study employs the Region of Interest-Multivariate Curve Resolution (ROI-MCR) protocol to achieve effective data compression and chromatographic resolution, thereby extracting the most informative features. This method was compared with a classical approach for feature extraction from chromatographic data, namely Compound Discoverer (CD) software. The features extracted by both methods were analysed through Principal Component Analysis (PCA) and ASCA (ANOVA Simultaneous Component Analysis). The comparison of ROI-MCR and CD approaches demonstrated that while both methods yielded similar overall conclusions, ROI-MCR provided a more streamlined and manageable dataset, facilitating easier interpretation of the metabolic differences. Both approaches indicated that amino acids, fatty acids, and bacterial activity-related compounds played significant roles in distinguishing between the two sample types.

Impact of milk feeding regimens on growth, intake, efficiency, and costs in pre-weaned crossbred calves

The high milk (20% of weight) feeding in initial life is beneficial for growth, feed efficiency, and welfare of calves. The experiment aimed to evaluate the impact of different milk-feeding regimens on the growth, intake, physiological responses, blood and faeces attributes, feed efficiency, and feeding cost in crossbred calves. Thirty (n=30) healthy pre-weaned crossbred calves (75% HF × 25% Kankrej) were divided into five groups using a completely randomized design. The calves were fed milk 10% of body weight (T1); 4 L/day during the entire experiment (T2); 6,4,2 L/day during 2-6, 7-9, and 10-13 weeks of age (T3); and early weaning protocols 7, 5 L/day during 2-6, and 7-9 weeks of age (T4); as well as 8, 4 L/day during 2-6, and 7-9 weeks of age (T5), respectively after an adaptation of seven days. The feeding of concentrate, dry, and green fodder was common in all groups. The effect of milk-feeding regimens on body weight, body measurements, intake, and feed efficiency were non-significant. The evaluation of physiological responses, faecal consistency score, and blood haematology indicated that it was safe to feed different milk regimens. The milk feeding up to 13 weeks of age (T1, T2, T3) significantly lowered the cost of feeding for weight gain than the early weaning protocol (T4, T5). Among them, the feeding of T3 regimen was economical for weight gain without affecting the growth performance, feed efficiency, and health attributes of crossbred calves.

Transforming the feeding regime towards low-input increases the environmental impact of organic milk production on a case study farm in central germany

Abstract Purpose Despite the direct effect of the feeding regime on the environmental impacts of dairy farming systems, its level of intensity, particularly in organic systems, has rarely been investigated. This study compares the environmental impact of a high-input feeding regime with a grassland-based, low-input feeding regime scenario within an organic milk production system conducted on Gladbacherhof, the research farm of Justus Liebig University Giessen, in Central Germany. Methods An integrated Life Cycle Assessment (LCA) analysis was performed from a cradle-to-farm gate perspective to quantify five environmental impacts, namely Global Warming (GW), Non-Renewable Energy Use (NREU), Land Use (LU), Terrestrial Acidification (TA), and Freshwater Eutrophication (FE). All agronomic data of the Gladbacherhof research farm, averaged over the years 2010–2017, were included. When not directly measured on the farm, ecoinvent data were included. Results and discussion Contrary to our hypothesis, the results suggest that a grassland-based low-input system has a higher environmental impact as compared to a high-input system for each of the five impact categories when using fat and protein-corrected milk (FPCM) as the functional unit. A 50% reduction in concentrates and exclusion of maize silage from the feed ration in the modelled low-input production system lead to a 20% drop in milk yield. To balance the energy content in low-input feeding ration, longer grazing period and higher amount of hay, alfalfa, and grass silage are required. This in turn results in higher emissions from enteric fermentation, manure management, and feed production and hence in higher environmental impact, particularly for GW, TA, and FE. Conclusions This study is one of the few that directly explores the environmental impact of feeding intensity in an organic milk production system. Nevertheless, there is a lack of research on consolidated emission factors for several greenhouse gas (GHG) sources in organic livestock and cropping systems to perform more robust carbon footprint calculations that comply with the Intergovernmental Panel on Climate Change (IPCC) Tier 3 GHG reporting guidelines. To generalize the results at the regional or national scale, direct comparisons with a larger number of organic farms representative of high-input and low-input intensities are still essential.

Case specific: Addressing co-digestion of wastewater sludge, cheese whey and cow manure: Kinetic modeling

The study investigated the methane production efficiency in a semi-continuous laboratory experiment with periodic feeding of wastewater sludge (WWS) as primary substrate and addition of whey (CW) and cow manure (CM). The short-term behavior of a real-scale anaerobic digester with WWS and the methane production improvements with different feeding mixtures of WWS, CW and CM were addressed. Gradual addition of CW to WWS (WWS:CW:CM = 70:20:0 to 70:55:0) increased the average daily methane production to 48.6 mL CH4/g COD/day and prevented reactor failure, but high VOA/TIC values showed that the reactors were conditionally stable evolution at an OLR of 8 g COD/L/day. Reactors that were additionally supplemented with CM (WWS:CW:CM = 70:55:10) achieved at least 12.3 % more methane than the reactors supplemented with WWS and CW alone. The highest methane production and process evolution in the reactors were achieved at OLRs between 7.5 and 8.7 g COD/L per day. After day 50, the addition of double the amount of CW further increased the methane production and VOA/TIC ratios. In this case, the OLR increased from 6.3 to 9.3 g COD/L/day. The concentration of propionic and acetic acid in all reactors increased above the recommended values and caused inhibition and instability. A strong positive Pearson correlation was found between the trace elements (Fe, Cu, Zn, Mn) detected by XRF. TE contributed to methane production, but to a lesser extent than TIC and NH4+-N. The simplified model successfully predicted methane production under a periodic feeding regime.