Abstract #M302
Section: Ruminant Nutrition (posters)
Session: Ruminant Nutrition I
Format: Poster
Day/Time: Monday 7:30 AM–9:30 AM
Location: Exhibit Hall A
Session: Ruminant Nutrition I
Format: Poster
Day/Time: Monday 7:30 AM–9:30 AM
Location: Exhibit Hall A
# M302
Investigating a novel source of nutritional selenium for ruminant animals.
K. Nedelkov1, C. M. M. R. Martins2, X. Chen3, A. Melgar4, M. T. Harper*4, S. Räisänen4, J. Oh4, E. H. Wall5, A. N. Hristov4, 1Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria, 2School of Veterinary Medicine and Animal Science, University of Sao Paulo, Pirassununga, Brazil, 3College of Pastoral Agriculture Science and Technology, Lanzhou University, Gansu, China, 4Department of Animal Science, The Pennsylvania State University, University Park, PA, 5Pancosma, Geneva, Switzerland.
Key Words: selenium, bioavailability, sheep
Investigating a novel source of nutritional selenium for ruminant animals.
K. Nedelkov1, C. M. M. R. Martins2, X. Chen3, A. Melgar4, M. T. Harper*4, S. Räisänen4, J. Oh4, E. H. Wall5, A. N. Hristov4, 1Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria, 2School of Veterinary Medicine and Animal Science, University of Sao Paulo, Pirassununga, Brazil, 3College of Pastoral Agriculture Science and Technology, Lanzhou University, Gansu, China, 4Department of Animal Science, The Pennsylvania State University, University Park, PA, 5Pancosma, Geneva, Switzerland.
The objective of the present study was to investigate the effectiveness of a novel selenium (Se) product (P-Se) as a source of bioavailable Se in sheep. Six Dorset ewes (93 kg BW; SD = 6.2 kg), housed in individual pens, were used in a 3 × 3 Latin square design experiment. The study had a 2-wk background, a 2-wk low-Se period, and 3 experimental periods of 3 wk each with 2-wk washout periods between them. The basal diet consisted of 1.5 kg chopped grass hay and 0.2 kg ground corn grain containing 1.5% trace mineralized salt without Se. Treatments were (1) unsupplemented control (0.065 mg feed Se/kg of dietary DM), (2) basal diet supplemented with P-Se (Pancosma, Switzerland) providing 0.25 mg Se/kg dietary DM; and (3) basal diet supplemented with sodium selenite providing 0.27 mg Se/kg dietary DM. Data were analyzed using the MIXED procedure of SAS with sheep and sheep within group as random effect. Plasma and fecal Se data were analyzed as repeated measures with AR(1) covariance structure. Compared with the control, Se concentration in blood plasma was increased (P < 0.001) by both Se treatments, but concentration was higher (P < 0.001) for P-Se (80.9 µg/L) compared with sodium selenite (72.4 µg/L). Plasma glutathione peroxidase activity was greater (P < 0.01) for the Se-supplemented diets compared with the control, but was not different between the 2 Se treatments. Absolute and background-corrected Se concentrations in feces were greater (P < 0.001) for the Se-supplemented diets than the control, and were less (or tended to be less; P = 0.14) for P-Se (441 or 422 µg/kg fecal DM) than for sodium selenite (526 or 511 µg/kg DM, respectively). Concentration of Se in urine was higher (P = 0.006) for P-Se (24.4 µg/L) compared with sodium selenite (12.2 µg/L) and the control (6.28 µg/L). Background-corrected urinary Se concentration, however, was increased by both dietary Se sources (P = 0.003) compared with the control and was higher in sheep supplemented with P-Se compared with sodium selenite. In this study, Se from P-Se had similar or greater bioavailability than Se from sodium selenite.
Key Words: selenium, bioavailability, sheep
