Stokes S R, Goetsch A L, Nejad H H, Murphy G, Jones A L, Mashburn S, Beers K W, Johnson Z B, Piper E L
Anim. Sci. Dept., University of Arkansas, Fayetteville 72701.
J Anim Sci. 1988 Jan;66(1):204-12. doi: 10.2527/jas1988.661204x.
Effects of supplemental Bermuda grass hay (BG) or ground corn on intake, digestion and performance of cattle consuming endophyte-infected fescue (I) were studied. In Exp. 1, a Latin square study, five growing Holstein steers (158.1 kg) consumed I ad libitum and were offered 0, .3, .6, .9 or 1.2% body weight (BW) of BG daily. Total dry matter (DM) intake rose linearly (P less than .05) with increasing BG, although intake was numerically similar with .6, .9 and 1.2% BW of BG. Digestibility was constant with diet (P greater than .10). Six growing Holstein steers used in Exp. 2, a Latin square with a 2 x 3 factorial arrangement of treatments, ingested I or noninfected (NI) fescue hay ad libitum with 0, .5 or 1.0% BW of ground corn. Total DM intake increased linearly as the level of corn rose (P less than .05). Total intake with I increased more with the first than with the second addition of corn, and the opposite occurred with NI (interaction between fescue infection and the quadratic effect of corn level, P less than .10). Organic matter digested (g/d) was greater for NI than for I and rose linearly with increasing corn ingestion (P less than .05). Ninety-six crossbred beef heifers and steers (184.2 kg avg initial live weight) were used in a 77-d fall grazing experiment (Exp. 3) with a 2 x 3 factorial treatment arrangement. Cattle grazed I or NI paddocks and were given no supplement or .34% BW of BG or .65% BW of ground corn on a daily basis (DM).(ABSTRACT TRUNCATED AT 250 WORDS)
研究了补充百慕大草干草（BG）或玉米粉对采食内生真菌感染的羊茅（I）的牛的采食量、消化率和生产性能的影响。在试验1中，采用拉丁方试验设计，五头生长中的荷斯坦公牛（体重158.1千克）自由采食I，并每天提供0、0.3、0.6、0.9或1.2%体重（BW）的BG。随着BG添加量的增加，总干物质（DM）摄入量呈线性增加（P<0.05），尽管0.6、0.9和1.2%BW的BG摄入量在数值上相似。消化率在不同日粮间保持恒定（P>0.10）。试验2中使用了六头生长中的荷斯坦公牛，采用2×3析因处理的拉丁方设计，自由采食I或未感染（NI）的羊茅干草，并添加0、0.5或1.0%BW的玉米粉。随着玉米水平的提高，总DM摄入量呈线性增加（P<0.05）。I组的总摄入量在第一次添加玉米时比第二次增加更多，而NI组则相反（羊茅感染与玉米水平的二次效应之间存在交互作用，P<0.10）。NI组消化的有机物（克/天）比I组多，且随着玉米摄入量的增加呈线性增加（P<0.05）。在一项为期77天的秋季放牧试验（试验3）中，采用2×3析因处理安排，使用了96头杂交肉牛小母牛和公牛（初始平均活重184.2千克）。牛群在I或NI围场放牧，每天不补充或补充0.34%BW的BG或0.65%BW的玉米粉（DM）。（摘要截于250字）
