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Effects of Vitamin E and Selenium Injections on Reproduction and Preweaning Lamb Survival in Ewes Consuming Diets Marginally Deficient in Selenium¹

New Mexico State University^,3, Las Cruces 88003

Abstract

Medium wool ewes were injected with vitamin E and(or) Se over a 2-yr period to evaluate the influence of these treatments on reproduction. Ewes were divided randomly into four groups, consisting of a control, plus groups receiving monthly sc injections of either 272 IU vitamin E, 4 mg Se or 272 IU vitamin E plus 4 mg Se during pregnancy. Selenium administration increased (P<.05) ewe blood Se concentrations, but had no effect (P>.10) on fertility (number of ewes lambing of ewes bred), prolificacy (number of lambs born/ewe lambing) or lamb sex ratio. Preweaning survival of lambs was increased (P<,05) by ewe treatments with either Se or vitamin E and thus, treated ewes weaned approximately 20% more lambs/ewe mated than did control ewes.

¹ Journal Article 927 of the New Mexico Agr. Exp. Sta.

² Present address: Cooperative Extension Service, Montana State Univ., Bozeman.

³ Dept. of Anim. and Range Sci.

⁴ Dept. of Exp. Sta.