Effects of late gestation supplementation of rumen undegradable protein, vitamin E, zinc, and chlortetracycline to ewes on indices of immune transfer and productivity.

摘要: Late gestation supplementation of feed additives, such as rumen undegradable intake protein (RUIP), vitamin E, Zn, and chlortetracycline, has in- consistently improved ewe/lamb productivity. In 3 ex- periments, Western white-faced ewes were supplement- ed for at least 30 d during late with 204 g/ (ewe·d) on a DM basis high (HS; 12.5% RUIP, 880 IU/kg 176 mg/kg Zn supplied by an AA complex, 352 chlortetracycline) or low (LS; 7.56% RUIP no supplemental supplements. Ewes different age (Exp. 1; 3- vs. 6-yr-old; n = 52) BCS 2; good poor BCS; 3.0 1.7 ± 0.5, respectively; 40) supplemented individually in 2 × fac- torial arrangement treatments 29 d. Thereafter, each ewe was group fed the appropriate supplement until lambing (14 7 d). Ewe intake, colostral IgG, lamb parainfluenza type (PI 3) titers, milk production, BW change, pro- duction measured both experiments. Exp. 3, approximately 600 HS LS over yr. BW, BCS, survival groups within year experimental unit. 1, lambs born to 3-yr-old had greater (P 0.01) anti- PI3 antibody titers than LS. Three-year-old < DMI 6-yr-old ewes. 1 2, 10 production differences ≤ 0.10) detected among treatments; however, did not differ either experiment. affect indices production. Under condition these studies, Similarly, productivity, nor interact supplement.