The ability of a yeast-derived cell wall preparation to minimize the toxic effects of high-ergot alkaloid tall fescue straw in beef cattle

被引:24
作者
Merrill, M. L.
Bohnert, D. W. [1 ]
Harmon, D. L.
Craig, A. M.
Schrick, F. N.
机构
[1] Oregon State Univ, E Oregon Agr Res Ctr, Corvallis, OR 97720 USA
[2] Univ Kentucky, Dept Anim Sci, Lexington, KY 40506 USA
[3] Oregon State Univ, Coll Vet Med, Corvallis, OR 97331 USA
[4] Univ Tennessee, Dept Anim Sci, Knoxville, TN 37996 USA
关键词
cattle; ergot alkaloid; ergovaline; prolactin;
D O I
10.2527/jas.2007-0075
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Two experiments were conducted to evaluate the influence of a yeast-derived cell wall preparation (YCW) on forage intake and digestibility, ruminal fermentation characteristics, serum prolactin and prolactin stores, and milk production in beef cattle consuming high-alkaloid tall fescue straw. In Exp. 1, 16 ruminally cannulated Angus x Hereford steers ( 200 +/- 6 kg of BW) were blocked by BW and within block were assigned to 1 of 4 treatments containing YCW at 0, 20, 40, or 60 g/d. Tall fescue straw ( 579 mu g of ergovaline/kg of DM) was provided at 120% of the previous 5-d average intake, with soybean meal used as a CP supplement. In the 29-d digestion study, total DM, OM, and NDF intakes and DM, OM, and NDF digestibilities were not affected by YCW supplementation (P > 0.13). Linear decreases in ruminal indigestible ADF outflow ( P = 0.10) and liquid dilution rate ( P = 0.03) were noted as YCW increased. Weekly serum prolactin was not affected by treatment (P > 0.50), but prolactin stores increased linearly as YCW increased (P = 0.05). In Exp. 2, 60 Angus x Hereford cows ( 517 +/- 5 kg of BW; approximately 200 d of gestation) were stratified by BCS (5.0 +/- 0.1) and randomly assigned to the same 4 YCW treatments as in Exp. 1 ( 447 mu g of ergovaline/kg of DM, high-alkaloid straw), but with the addition of a low-alkaloid straw ( 149 mu g of ergovaline/kg of DM; no YCW supplementation) as a control. Cows were provided ad libitum access to straw, and diets were supplemented with soybean meal daily. One cow was removed from the 40 g/d treatment because of clinical signs of fescue foot. No differences ( P > 0.20) were observed in preor postcalving BCS change or postcalving BW change. Control cows gained more BW ( P = 0.02) precalving compared with cows given 0 g/d of YCW. A linear increase ( P = 0.04) in milk production at 60 d postpartum was observed as YCW increased. Serum prolactin postcalving and the change from initial to postcalving increased linearly ( P = 0.02 and P = 0.06, respectively) with increasing YCW supplementation. In addition, postcalving serum prolactin was less for 0 g/d of YCW compared with the control ( P = 0.003) and 20 g/d of YCW ( P = 0.04). The YCW seemed to alleviate the prolactin depression normally associated with fescue toxicosis and therefore has the potential to be used successfully with other management practices when feeding or grazing high-alkaloid tall fescue.
引用
收藏
页码:2596 / 2605
页数:10
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