title: Effects of a single oral dose of a commercial selenium cobalt and vitamin preparation on ewe fertility.
abstract: The results of a field trial on 18 farms on the effects of dosing ewes with a commercial trace element supplemented to provide 5 mg selenium, 6.5 mg cobalt, 500,000 iu vitamin A, 12,000 iu vitamin D3 and 100 iu vitamin E two weeks before joining the ram showed no beneficial effect on reproductive performance. The mean level of the enzyme glutathione peroxidase (GSH-Px) ranged in control ewes from 8.7 to 58.6 units/ml erythrocytes. Reproductive responses to the treatment varied between farms but the variation was not related to flock selenium status as indicated by the GSH-Px test.
mesh_terms: D000818:Animals; D002762:Cholecalciferol / Q000494:pharmacology; D003035:Cobalt / Q000494:pharmacology*; D004338:Drug Combinations; D005260:Female; D005298:Fertility / Q000187:drug effects*; D005979:Glutathione Peroxidase / Q000097:blood; D011247:Pregnancy; D012643:Selenium / Q000494:pharmacology*; D012756:Sheep / Q000502:physiology*; D014801:Vitamin A / Q000494:pharmacology; D014810:Vitamin E / Q000494:pharmacology; D014815:Vitamins / Q000494:pharmacology*
chemical_list: D004338:Drug Combinations; D014815:Vitamins; D014801:Vitamin A; D014810:Vitamin E; D002762:Cholecalciferol; D003035:Cobalt; D005979:Glutathione Peroxidase; D012643:Selenium