Inorganic Selenium Supplementation Research Articles

Effects of organic and inorganic selenium supplementation on frozen-thawed ram semen at two cooling periods.

The aim of this study was to evaluate the effects of different selenium compounds on the sperm quality of cryopreserved ram semen. Ejaculates from four rams, collected using an artificial vagina heated to 38°C, were individually evaluated. The approved ejaculates were pooled and diluted (1:1 v:v) in Tris-egg yolk extender (20%, v/v) and separated into two control groups, one cooled for 2h and the other for 4h. The pooled ejaculates at the two cooling periods were supplemented with two doses (0.5 and 1μg/mL) of organic selenium (ORG), and inorganic selenium (SeNa), each. The samples were packed in 0.25ml straws, at a concentration of 400 × 106 sperms/mL and stored in liquid nitrogen. The straws were thawed in a water bath at 37°C for 20s, and the samples were subjected to sperm kinetics evaluation by Computer Assisted Semen Analysis software. Sperm membrane integrity, acrosome morphology, and mitochondrial potential were assessed. In addition, oxidative stress markers reactive oxygen species (ROS), ferric reducing antioxidant power (FRAP), thiobarbituric acid reactive species (TBARS), and glutathione peroxidase (GPx) enzyme activity) were also evaluated. No significant improvement was observed in the ram semen quality at the two cooling times. Supplementation of the freezing extender with 0.5μg/mL ORG, subjected to 4h cooling period, increased the sperm motility when compared with the control group at the same cooling time. In addition, the 0.5μg/mL SeNa group, under the 2h cooling period, showed an increase in sperm motility when compared to the control group at the same cooling period. Considering the importance of sperm motility as a fertility parameter, our study indicates that supplementation with ORG and SeNa can help improve the total motility of the cryopreserved ram semen.

Effect of Inorganic Selenium Supplementation on Thyroid Hormone and Redox Status in Broiler under Dexamethasone Induced Stress

Effect of Inorganic Selenium Supplementation on Thyroid Hormone and Redox Status in Broiler under Dexamethasone Induced Stress

Effect of Inorganic Selenium Supplementation on Gut Morphology and Growth Performance in Broilers under Stress Conditions in Khyber Pakhtunkhwa, Pakistan

Effect of Inorganic Selenium Supplementation on Gut Morphology and Growth Performance in Broilers under Stress Conditions in Khyber Pakhtunkhwa, Pakistan

Effects of different inorganic selenium levels in laying quails (Coturnix coturnix Japonica) diets on performance, egg quality, and serum biochemical parameters

Inorganic selenium supplementation in poultry diet has been controversial. It has been linked that the excess and deficiency of this mineral can lead to health problems in these animals. However, this fact is not so evident in quails. In this research 120 female quails (220.6 ± 8.2 g) at 10 weeks of age were allocated to five treatment groups with six replicates of four quails in each. Experimental diets were formed by adding 0, 0.25, 0.50, 0.75 or1.00 mg/kg of inorganic selenium (sodium-selenite) to the diet containing 0.12 mg/kg of selenium. We observed that performance parameters, mortality, egg external, and internal quality of quails were not affected by the supplementation of inorganic selenium to the diet Serum glucose (P = 0.0020) and creatinine (P = 0.0333) levels were affected by inorganic selenium supplementation, but no differences were found for other parameters among those treatments. The addition of 0.50 mg/kg of inorganic selenium to the diet increased serum glucose levels of laying quails compared with the control group. While serum creatinine level was maximized with the addition of 0.25 mg/kg inorganic selenium to the diet, and it was minimized with the addition of 0.50 mg/kg inorganic selenium. Supplementation with inorganic selenium (0 to 1.00 mg/kg) in laying quail diets did not have any adverse effect on performance, mortality, and egg quality during the study. No abnormalities were found in the serum parameters that would lead to the suspicion of metabolic disease in the quails.

Label-Free Mass Spectrometry-Based Proteomic Analysis in Lamb Tissues after Fish Oil, Carnosic Acid, and Inorganic Selenium Supplementation.

Simple SummaryAdvances in proteomics and bioinformatics analysis offer the potential to investigate nutrients’ influence on protein expression profiles, and consequently on biological processes, molecular functions, and cellular components. However, knowledge in this area, particular about the exact way selenium modulates protein expression, remains limited. Therefore, in this project, global differential proteomic experiments were carried out in order to identify changes in the expression of proteins in animal tissues obtained from lambs on a specific diet involving the addition of a combination of different supplements, namely, inorganic selenium compounds, fish oil, and carnosic acid. Following inorganic selenium supplementation, a protein-protein interaction network analysis of forty differentially-expressed proteins indicated two significant clusters.Selenium is an essential nutrient, building twenty five identified selenoproteins in humans known to perform several important biological functions. The small amount of selenium in the earth’s crust in certain regions along with the risk of deficiency in organisms have resulted in increasingly popular dietary supplementation in animals, implemented via, e.g., inorganic selenium compounds. Even though selenium is included in selenoproteins in the form of selenocysteine, the dietary effect of selenium may result in the expression of other proteins or genes. Very little is known about the expression effects modulated by selenium. The present study aimed to examine the significance of protein expression in lamb tissues obtained after dietary supplementation with selenium (sodium selenate) and two other feed additives, fish oil and carnosic acid. Label-free mass spectrometry-based proteomic analysis was successfully applied to examine the animal tissues. Protein-protein interaction network analysis of forty differently-expressed proteins following inorganic selenium supplementation indicated two significant clusters which are involved in cell adhesion, heart development, actin filament-based movement, plasma membrane repair, and establishment of organelle localization.

A Comparison of the Beneficial Effects of Inorganic, Organic, and Elemental Nano-selenium on Nile Tilapia: Growth, Immunity, Oxidative Status, Gut Morphology, and Immune Gene Expression.

This study investigates the effects of different sources of selenium (inorganic (SSE), organic (OSE), and elemental nano-selenium (NSE)) on the performance of Nile tilapia (Oreochromis niloticus). In total, 204 Nile tilapia fingerlings were randomly divided into 4 equal groups fed 1 of 4 diets: a control (adding no selenium) and 3 diets as selenium sources (1mg/kg diet), After a 65-day feeding trial, the growth performance parameters of Nile tilapia were significantly enhanced by dietary selenium supplementation (P < 0.05), with the highest values recorded in the OSE- and NSE-supplemented groups. The selenium-supplemented groups had the highest packed-cell volume, hemoglobin, and red blood cell levels, with the highest values seen in the NSE-supplemented group (P < 0.05). Innate immune-related enzymes and immunoglobulin levels were significantly enhanced with selenium supplementation (P < 0.05); the NSE group demonstrated the highest significant levels of these enzyme activities (P < 0.05). In all selenium-supplemented groups, malondialdehyde levels were significantly and equally reduced (P < 0.05) compared with levels in the control. Bactericidal activity was only enhanced in the NSE group (P < 0.05) compared with other treatments. The expression of TNF-α and IL-Iβ genes was significantly upregulated in selenium-supplemented groups, with the highest expression in the OSE and NSE groups (P < 0.05). These findings support the importance of incorporating selenium in the diet of Nile tilapia. Furthermore, elementary nano-selenium is more effective than inorganic or organic selenium supplementation at improving Nile tilapia growth performance and overall health.

Effect of organic and inorganic dietary selenium supplementation on gene expression in oviduct tissues and Selenoproteins gene expression in Lohman Brown-classic laying hens

BackgroundThe oviduct of a hen provides a conducive environment for egg formation, which needs a large amount of mineral elements from the blood via trans-epithelial permeability. Eggshell is the calcified layer on the outside of an egg that provides protection and is critical for egg quality. However, little is known about the genes or proteins involved in eggshell formation, and their relationship to dietary microminerals. We hypothesized that dietary selenium supplementation in chickens will influence genes involved in eggshell biomineralization, and improve laying hen antioxidant capacity. The objective of this research was to investigate how organic and inorganic dietary selenium supplementation affected mRNA expression of shell gland genes involved in eggshell biomineralization, and selenoproteins gene expression in Lohman Brown-Classic laying hens.ResultsShell gland (Uterus) and liver tissue samples were collected from hens during the active growth phase of calcification (15–20 h post-ovulation) for RT-PCR analysis. In the oviduct (shell gland and magnum) and liver of laying hens, the relative expression of functional eggshell and hepatic selenoproteins genes was investigated. Results of qPCR confirmed the higher (p < 0.05) mRNA expression of OC-17 and OC-116 in shell gland of organic Se hen compared to inorganic and basal diet treatments. Similarly, dietary Se treatments affected the mRNA expression of OCX-32 and OCX-36 in the shell gland of laying hens. In the magnum, mRNA expression of OC-17 was significantly (p < 0.05) higher in hens fed-bacterial organic, while OC-116 mRNA expression was down-regulated in dietary Se supplemented groups compared to non-Se supplemented hens. Moreover, when compared to sodium selenite, only ADS18 bacterial Se showed significantly (p < 0.05) higher mRNA levels in GPX1, GPX4, DIO1, DIO2 and SELW1, while Se-yeast showed significantly (p < 0.05) higher mRNA levels in TXNRD1 than the non-Se group.ConclusionsDietary Se supplementation especially that from a bacterial organic source, improved shell gland and hepatic selenoproteins gene expression in laying hens, indicating that it could be used as a viable alternative source of Se in laying hens. The findings could suggest that organic Se upregulation of shell gland genes and hepatic selenoproteins in laying hens is efficient.

Preventive, Behavioral, Productive, and Tissue Modification using Green Synthesized Selenium Nanoparticles in the Drinking Water of Two Broiler Breeds under Microbial Stress

ABSTRACT A study was conducted to investigate the influence of selenium nanoparticles (SeNPS) and inorganic selenium supplementation in the drinking water on behavior, performance, and immunity of Arbor Acres® and Ross®308 broilers exposed to E. coli O157:H7 1.6 × 108 challenge at the 10th day of age. 180 one-day-old female broilers were divided into six groups, each with 30 chicks. G1 and G4 were supplied with 1 mL SeNPS 100 mg.L-1/L, G2 and G5 were supplied with 1 mL inorganic selenium 100 mg.L-1/L, and G3 and G6 were supplied with non-supplemented water. Where, G1, G2, and G3 were Arbor Acres®, while G4, G5, and G6 were Ross®308 broilers. A total of 1280 samples (160 sera, 160 intestinal swabs and 960 organ samples including liver, spleen, bursa, heart, breast muscles, and thymus) were collected in a study period of 38 days. A highly significant increase (p<0.01) of weight gain, feed conversion, performance index, total protein, albumin, alanine aminotransferase, aspartate aminotransferase, immunoglobulin G and M, total antioxidant capacity, malondialdehyde, and superoxide dismutase was recorded in G4 Ross®308 compared to other supplemented and control groups. G1 Arbor Acres® and G4 Ross®308 broilers, also revealed a highly significant decline (p<0.01) in total bacterial and enterobacteriaceae counts of intestine and breast muscles compared to G2 Arbor Acres® and G5 Ross®308 broilers and to controls. Photomicrographs revealed a higher degree of cellular and tissue protection in G4 and G5 Ross®308 compared to G1 and G2 Arbor Acres® broilers. An improvement from SeNPS supplementation was detected on behavior, performance, bacterial load, immunological, antioxidant profiles, and tissue architecture in broilers breeds with special reference to Ross®308 compared to Arbor Acres® broilers.

Supplementation of inorganic and organic selenium on antioxidant, immunity status and bioavailability in broiler breeder hen

Mohanty, P.P., Panda, N., Swain, R.K., Behura, N.C., Panigrahi, B. and Ray, P. 2020. Supplementation of inorganic and organic selenium on antioxidant, immunity status and bioavailability in broiler breeder hen. Animal Nutrition and Feed Technology, 20: 441–451.

Effect of source and concentration of dietary selenium on laying performance of egg-type breeders and antioxidant status of their offspring under delayed post- hatch feeding

Abstract The present study aimed to evaluate the effect of dietary organic or inorganic selenium (Se) supplementation on laying and hatching performance, egg Se content and liver glutathione peroxidase (GSH-Px) concentration of egg-type breeders as well as their offspring antioxidant status under 36Â h post-hatch feed withdrawal. Two hundred and seventy white egg-type breeders were used. The hens were randomly assigned to five dietary treatments. The basal diet contained no supplemental Se (Control). The four treatment groups consisted of two selenium sources (inorganic and organic, Se inorg and Se org, respectively) and two selenium levels (0.20 and 0.35Â mg Se/kg diet). The total analysed Se concentration in the diets was between 0.137 and 0.138Â mg/kg for Control, while it was 0.342 and 0.340Â mg/kg for 0.20 Se inorg, 0.339 and 0.351Â mg/kg for 0.20 Se org, 0.485 and 0.489Â mg/kg for 0.35 Se inorg, 0.481 and 0.495Â mg/kg for 0.35 Se org from 21 to 40 and 41 to 49 weeks, respectively. There was no effect of diets on laying performance, egg quality, and hatchability. Dietary Se supplementation increased egg Se content compared to Control, being higher in eggs from hens fed Se org than those from hens fed Se inorg. Liver GSH-Px activity of hens fed 0.35Â mg Se/kg was higher than in hens fed 0.20Â mg/kg Se. On d of hatch and 36Â h post-hatch, residual yolk sac Se content of chicks from hens fed 0.35Â mg Se/kg was higher than that of chicks from hens fed 0.20Â mg/kg Se. After 36Â h post-hatch feed withdrawal, plasma and liver GSH-Px activity of chicks from Se groups were higher than in chicks from the Control. It was concluded that dietary maternal Se would provide a protective mechanism for day-old chicks for coping with stressful situations exposed after hatching.

Influence of Selenium on the Morphology of Immune System Organs in Healthy Broilers

Abstract This study aimed to establish the effect of dietary supplementation in broiler chickens of organic and inorganic selenium on the weight and structure of the thymus, bursa of Fabricius and spleen. Three dietary regimes were studied in Flex and F15 Hubbard chickens: (i) control, (ii) diets containing 0.5 mg organic selenium/kg by selenized yeast, (iii) diets supplemented with 0.5 mg ionic selenium/kg (sodium selenite). The results showed that the feed additives did not affect the relative weight of the immune system organs, i.e. bursa of Fabricius, thymus and spleen. The organic selenium in the F15 resulted in thinning of the thymic cortex and partial depletion of the lymphoid cells. Moreover, both the organic and inorganic selenium supplementation resulted in depopulation of bursal medulla from lymphocytes in the F15 group. In contrast, in Flex chickens no significant differences in histological structure and morphometric values of lymphoid organs between chickens fed organic and inorganic selenium were found.

Organic and inorganic selenium supplementation on the productive and reproductive performance of hair ewes

The objective of this study was to evaluate the effect of supplementation with organic and inorganic selenium on the productive and reproductive performance of ewes and their offspring. Selenium (Se) is an essential mineral for sheep, studies have found its intestinal absorption and biodisponibility in the animal is greater when it comes from an organic source. A total of 18 multiparous and 22 nulliparous ewes Pelibuey breed were used in this study, averaging 54.8 ± 9.4 kg and 39.7 ± 5.6 kg of body weight (BW). The experimental units were blocked by the number of parturitions (none or more than one). Then randomly assigned to one treatment: basal diet +1.2 ppm of organic Se (OSe, Sel- Plex®) or basal diet +1.2 ppm inorganic Se (ISe). Using the linear model PROC MIXED, BW changes were measured in ewes and average daily gain (ADG) in offspring. Fisher’s test, chi-squared test and t test were used for analyzing reproductive rates and production efficiency. No differences (P &gt; 0.05) were found for BW changes, productive efficiency, and pregnancy rate between treatments. Prolificacy was higher (P &lt; 0.05) for primiparous ewes in the OSe group vs the ISe group (66.7 vs 18.2 %). No differences (P &gt; 0.05) were found for birth weights of lambs. The ADG was higher (P &lt; 0.05) for the offspring of ISe vs OSe ewes. This indicates that the OSe supplementation improves reproductive parameters, but not the productive such as ADG. DOI: https://doi.org/10.54167/tch.v13i1.303

273 Supplementation of Organic and Inorganic Selenium on Stress of Weaned Pigs. 1. Growth Performance and Immune Responses.

273 Supplementation of Organic and Inorganic Selenium on Stress of Weaned Pigs. 1. Growth Performance and Immune Responses.

168 Supplementation of Organic and Inorganic Selenium on Oxidative Stress of Weaned Pigs. 2. Antioxidant Capacity.

168 Supplementation of Organic and Inorganic Selenium on Oxidative Stress of Weaned Pigs. 2. Antioxidant Capacity.

EFFECT OF DIFFERENT DIETARY SELENIUM SOURCES SUPPLEMENTATION ON NUTRIENT DIGESTIBILITY, PRODUCTIVE PERFORMANCE AND SOME SERUM BIOCHEMICAL INDICES IN SHEEP

A total number of 32 of Ossimi lambs averaged 29.25 ± 2.02 kg and 4 months old were used in this experiment to compare the effects of dietary supplementation of inorganic selenium (sodium selenite), organic selenium (Se-yeast) and Nano-Se particles on nutrients digestibility, nutritive value, productive performance and serum biochemical indices of lambs. The animals were allocated into four equal groups (8 lambs each). The lambs of control group were fed on basal diet containing 0.17 mg Se/kg dry matter (DM). The treated lamb groups fed on the same basal diet, in which Se at 0.30 mg/kg DM was provided as sodium selenite (SS), selenium yeast (SY) and Nano-Se particles (NS). The results showed that digestibility of DM was higher (P<0.05) for lambs fed SS, SY and NS than those fed control. Digestibility of OM, CP, CF, EE, NFE and the values of digestible crude protein (DCP) and total digestible nutrients (TDN) were increased (P<0.05) for lambs fed SY and NS compared with those fed SS or control. Averages of final body weight (FBW) were increased (P<0.05) for lambs fed SY and NS compared with those fed SS and control. Average of FBW was greater (P<0.05) for lambs fed NS than those fed SY. The averages of daily gain (ADG) were increased (P<0.05) for lambs fed SS, SY and NS vs. those fed control with significant (P<0.05) differences among treatments. No significant differences were detected in averages of feed intakes of Alfalfa, DM and total DM (TDM) for lambs fed SS, SY and NS vs. control. While, the intakes of DCP and TDN were greater (P<0.05) for lambs fed SS, SY and NS vs. those fed control with significant (P<0.05) differences among treatments. The averages of feed conversion (FC) of DM (FC-DM), DCP (FC-DCP) and TDN (FC-TDN) were improved (P<0.05) for lambs fed SS, SY and NS vs. those fed control. The highest values of productive performance parameters (FBW, ADG, DCPI, TDNI, FC-DCP and FC-TDN) were noticed for lambs fed NS followed by those fed SY and then SS and control. Lambs fed SY and NS had higher (P<0.05) values of serum total protein and globulin than those fed SS or control. Also, there was an increase (P<0.05) in serum glucose concentrations for lambs fed diets SS, SY and NS vs. control, with higher levels (P<0.05) in NS than in SS and SY. No significant differences were noticed in serum concentrations of albumin, cholesterol, alanine transaminase (ALT) and aspartate transaminase (AST) enzyme activities. Serum total antioxidant capacity (TAC) concentrations, glutathione peroxidase (GSH-Px) activity and testosterone levels were increased (P<0.05) for lambs fed SS, SY and NS vs. control. Higher (P<0.05) levels of TAC, GSH-Px and testosterone levels were observed for lambs fed NS than those fed SS and SY. It could be concluded that dietary supplementation of Nano-Se was more effective than sodium selenite and Se-yeast to improve nutrients digestibility, feeding values, growth performance, some serum metabolic indices, antioxidant status and reproductive efficiency of male lambs.

Maternal Selenium Supplementation Enhanced Skeletal Muscle Development Through Increasing Protein Synthesis and SelW mRNA Levels of their Offspring.

The present study aimed to investigate the influence of maternal selenium supplementation on the skeletal muscle development of the offspring. A total of 720 Ross 308 broiler breeders at 24-week-old were allocated into 3 treatments with 6 replicates of 40 hens each and fed with 0mg/kg-(group Se/C), 0.5mg/kg organic-(group Se/O), and 0.5mg/kg inorganic-(group Se/I) selenium, respectively for 8weeks. The male offspring from each nutritional treatment were divided and housed into 8 cages of 12 birds each and fed with a commercial diet supplemented with selenium from Na2SeO3 at 0.15mg/kg. Results showed that Se/O group had the highest selenium deposition (P < 0.05) in the egg yolk and albumen. Furthermore, maternal selenium supplementation promoted breast muscle yield; increased serum insulin and IGF-I concentration; upregulated AKT, mammalian target of rapamycin (mTOR), P70S6K, Myf5, MyoD, MyoG, and SelW mRNA levels; and improved the phosphorylation of AKT at Serine 473 residue, mTOR at Serine 2448 residue, and FOXO at Serine 256 residue in skeletal muscles of the offspring. In contrast, the hens' diet supplemented with selenium could result in reduction of uric acid level in serum and downregulation of Atrogin-1 and MuRF1 mRNA levels in the skeletal muscle of the offspring. Additionally, no significant effect on the skeletal muscle development post-hatch was observed between organic and inorganic selenium supplementation. In conclusion, maternal organic selenium supplementation improved selenium deposition in egg; however, no significant effect has been detected on the breast muscle development of the offspring of broiler breeder compared with inorganic selenium supplementation.

Effect of supplementation with inorganic and organic selenium on sperm quality and quantity in north-east Bulgarian merino rams

Selenium is a trace element, which stimulates antioxidant defenses and improves reproductive functions in human and animals, under the form of selenoproteins. The objective of the study was to evaluate the effect of selenium, supplemeted as inorganic or organic form in the diet of stud rams, on some of their semen parameters. The experiment was performed with 15 clinically healthy rams from North East Bulgarian merino breed. The animals were divided in three groups (5 per group). The rams from first experimental group (G1) received a diet with supplementation of 4,0mg sodium selenite (NapH of the ejaculates and motility, concentration and in vitro survivability of the spermatozoa at 39?? for 360 min. 2SeO3) per animal per day, while the animals of the second experimental group (G2) obtained diet with 1.83g L-selenomethionine (Sel-Plex, Alltech, USA) per animal per day. Eventually, each animal from the G1 and G2 received 1.83g selenium per day. The control group (GC) received a diet without supplementation of selenium. The principal composition of the diet in each group was the same. The ejaculates were obtained via artificial vagina. The evaluated parameters were volume and It was found that the supplementation of ram studs diet either with inorganic and organic selenium led to increase in the volume of the ejaculates, motility and survivability of the spermatozoa. The pH of the freshly obtained semen was not affected by selenium treatment.

Levels of supplementation of inorganic selenium and vitamin E for meat quail aged 0 to 14 and 14 to 35days.

Two experiments were carried out to determine the levels of supplementation of inorganic selenium (Se) and vitamin E (VE) in diets of quails aged 0-14 and 14-35 days old. A completely randomized design was used in a factorial design (Se=0.1125; 0.2250; 0.3375 and 0.4500mgkg-1 diet-1 ×VE=10; 23; 36 and 49IUkg-1 diet-1 ). In experiment 1, quail (n=2,400) were aged 0-14days and were divided into 16 treatments, with three replicates of 50 birds. In experiment 2, quail (n=1,680) were aged 14-35days and were divided into the same treatments, with three replicates of 35 birds. At age 0-14days, the levels of VE did not affect performance (p>.05); however, the feed conversion (FC) was influenced by a quadratic effect (p=.0515), according to the level of Se, with a higher level estimated at 0.29mg Sekg-1 diet-1 . At age 14-35days, there was a linear effect with interaction (Se×VE), for FC (p=.0150) and weight gain (WG; p=.0266). FC (Se, p=.0048 and VE, p=.0019) and WG (Se, p=.0049 and VE, p=.0068) improved linearly with increasing levels of Se and VE. The feed intake (FI) decreased linearly (p=.0582) as a function of VE. The carcass yield showed a quadratic effect (p=.0056) on the levels of VE, with a higher yield estimation of 27.24 IU VE/kg of diet. It can be concluded that the optimum level of supplementation at age 0-14days was 0.29mg Sekg-1 diet-1 and 10IU VEkg-1 diet-1 and at age 14-35days, it was 0.4500mg Sekg-1 diet-1 and 49IU of VEkg-1 diet-1 .

Supplementation of organic and inorganic selenium to late gestation and early lactation beef cows effect on progeny feedlot performance and carcass characteristics.

Angus × Simmental cows ( = 48, BW = 594 kg, BCS = 5.26, age = 2.7) pregnant with male fetuses were used to determine the effect of selenium source during the last 80 d of gestation and first 108 d of lactation on progeny feedlot performance. At 203 d of gestation, cows were blocked by BW, breed composition, and calf sire and randomly allotted to 1 of 3 treatments: no supplemental Se, 3 mg/d inorganic Se (sodium selenite), and 3 mg/d organic Se (Sel-plex). Maternal diets were formulated to contain 10.4% CP and 0.90 Mcal/kg NE during gestation and 12.1% CP and 1.01 Mcal/kg NE during lactation. Basal diets contained 0.07 and 0.11 mg/kg Se for gestation and lactation diets, respectively. Diets were fed daily as a total mixed ration, and no additional Se, 3 mg/d Se as sodium selenite, or 3 mg/d Se as Sel-Plex were top-dressed daily. Treatment diets were fed through 108 d postpartum (DPP). At 108 DPP cow-calf pairs were commingled until weaning at 210 DPP. At 28 d postweaning, steers ( = 47, BW = 301 kg) were placed in individual pens and fed a diet formulated to provide 13.9% CP and 1.24 Mcal/kg NE. No supplemental Se was fed; however, basal Se concentration was 0.10 mg/kg. The diet was delivered as a total mixed ration once daily. Steers were slaughtered at a target BW of 625 kg. Steers from cows supplemented with organic Se tended to enter the feedlot heavier ( = 0.06) than steers from cows supplemented with inorganic Se. There was no difference in ADG among treatments ( ≥ 0.73), but steers from organic Se cows tended to spend fewer days on feed compared to steers from inorganic Se cows ( = 0.09). Steers from organic Se cows had a greater overall DMI compared to steers from inorganic Se cows ( = 0.04), but there was no difference in overall G:F ( = 0.49). Dressing percentage was greater for steers from cows fed no Se compared with steers from cows fed either inorganic or organic Se ( = 0.03). Maternal Se source had no effect on HCW, back fat, percentage KPH, LM area, yield grade, marbling score, or quality grade distribution ( ≥ 0.17) of progeny. In conclusion, maternal supplementation with organic Se appears to have a long-term benefit on intake of steer progeny and may result in improvements in growth that could decrease days on feed.

Supplementation of organic and inorganic selenium to late gestation and early lactation beef cows effect on cow and preweaning calf performance.

Angus × Simmental cows ( = 48; BW = 595 ± 17.4 kg, BCS = 5.26 ± 0.05, and age = 2.3 ± 0.07 yr), pregnant with male fetuses, were used to determine the effect of Se source during the last 80 d of gestation and first 108 d of lactation on cow and calf performance. At 203 d in gestation, cows were blocked by BW, breed composition, age, and calf sire and randomly allotted to organic Se, inorganic Se, or no Se treatments. Diets contained corn silage, corn stover, haylage, dried distillers' grains with solubles, and minerals and were formulated to contain 10.4% CP and 0.90 Mcal/kg NEg during gestation and 12.1% CP and 1.01 Mcal/kg NEg during lactation. Diets were fed daily as a total mixed ration and none, 3 mg/d Se as sodium selenite, or 3 mg/d Se as Sel-Plex were top-dressed daily. At 68 d postpartum (DPP), milk production was calculated using the weigh-suckle-weigh procedure and a milk sample was collected to determine composition. At 108 DPP, cow-calf pairs were commingled until weaning at 210 DPP. Cow BW and BCS ( ≥ 0.56) did not differ between treatments at any time point during the study. Milk production, milk fat, and total solids ( ≥ 0.38) did not differ among treatments. Milk protein tended to increase in cows fed inorganic Se compared with cows fed organic Se ( = 0.07) and milk lactose tended to be greatest in cows fed organic Se ( = 0.10). Conception to AI and overall pregnancy rates did not differ between treatments ( ≥ 0.39). Calf weights and ADG did not differ through 108 DPP ( ≥ 0.77) or for the preweaning period ( ≥ 0.33). Plasma Se concentration was adequate for all cows and did not differ among treatments for cows ( ≥ 0.37) or calves ( ≥ 0.90). Liver Se concentrations in cows fed inorganic or organic Se were greater than in control cows ( < 0.01). Longissimus muscles biopsies taken from progeny at 108 DPP also did not differ between treatments ( = 0.45). In conclusion, dietary Se source did not affect cow performance, milk production, or reproductive efficiency. Organic Se decreased milk protein and increased milk lactose but did not alter preweaning performance of progeny from Se-adequate cows.