Effects of supplemental safflower and vitamin E during late gestation on lamb growth, serum metabolites, and thermogenesis.

摘要: Twin-bearing Targhee ewes (Exp. 1, 1 yr, n = 42) and 1,182 single- twin-bearing whiteface range 2, 8 experimental units over 2 yr) were used in a x factorial arrangement of treatments to determine the effect supplemental energy source level vitamin E supplement on lamb serum metabolites thermogenesis 1) growth 2). During late gestation, individually fed or group-fed 2) daily supplement. Supplements 226 g/ewe safflower seed (DM basis; SS) with either 350 IU/ewe (VE) no added (VC) E; 340 barley-based grain GC) VE VC. One hour postpartum Exp. twin-born lambs placed 0 degrees C dry cold chamber for 30 min. Lamb rectal temperature was recorded every 60 s blood samples taken immediately before after exposure. In weighed at birth, turnout from confinement spring (32 d age +/- 7; turnout), weaning (120 7). Ewes weaning. interaction detected (P < 0.10) body change NEFA glucose concentrations. Lambs SSVC had lowest 0.01) decreased 0.08) concentration. The SS tended have 0.11) concentrations urea N (BUN) thyroxine min than did born GC ewes. After exposure, increased BUN, triiodothyronine, triiodothyronine:thyroxine 0.10). kilograms per ewe survival greater 0.07) lambs. Based BUN during exposure lambs, rate SSVC-supplemented appeared give birth an apparently energetic capacity. This may compromise ability newborn adapt extreme environmental conditions.