Hall K L, Goetsch A L, Forster L A
Dept. of Anim. and Poult. Sci., University of Arkansas, Fayetteville 72701.
J Anim Sci. 1990 Jun;68(6):1674-82. doi: 10.2527/1990.6861674x.
Two latin squares were conducted to determine the effects on feed intake and nutrient digestion of adding a ruminal buffer or DL-methionine to supplemental ground corn for Holstein steers (avg BW of 286 and 222 kg in Exp. 1 and 2, respectively) with ad libitum access to bermudagrass hay. In Exp. 1, steers were not supplemented (control) or were given .5 (LC) or 1.0% BW/d (HC) of ground corn without or with .021% BW of sodium bicarbonate (B). Total DMI was 2.39, 2.71, 2.79, 2.81 and 2.98% BW (effects of supplementation [P less than .05], level of corn [P less than .05] and buffer [P less than .06]), and OM digested was 3.56, 4.65, 4.65, 4.96 and 5.34 kg/d for control, LC, LCB, HC and HCB, respectively (effects of supplementation and corn level, P less than .05). In Exp. 2, corn levels were .24 and .74% BW/d and .0022% BW of DL-methionine (M) replaced B. Total DMI was 2.85, 3.00, 2.99, 3.22 and 3.34% BW (effects of supplementation and corn level, P less than .05), and digestible OM intake was 3.78, 4.24, 4.30, 4.84 and 5.12 kg/d for control, LC, LCM, HC and HCM, respectively (effects of supplementation and corn level, P less than .05). Overall, changes in feed intake and digestion with additions of a ruminal buffer and DL-methionine to corn supplements were not marked; however, buffer addition increased DMI intake to the greatest degree with 1.0% BW/d of corn.
进行了两个拉丁方试验，以确定在给荷斯坦阉牛（试验1和试验2中平均体重分别为286千克和222千克）补饲粉碎玉米时添加瘤胃缓冲剂或DL-蛋氨酸对采食量和养分消化率的影响，这些阉牛可自由采食百慕大干草。在试验1中，阉牛不补饲（对照），或给予0.5%（低水平补饲，LC）或1.0%体重/天（高水平补饲，HC）的粉碎玉米，分别添加或不添加0.021%体重的碳酸氢钠（B）。总干物质采食量分别为体重的2.39%、2.71%、2.79%、2.81%和2.98%（补饲的影响[P小于0.05]、玉米水平的影响[P小于0.05]和缓冲剂的影响[P小于0.06]），对照、LC、LCB、HC和HCB组的有机物消化量分别为3.56千克/天、4.65千克/天、4.65千克/天、4.96千克/天和5.34千克/天（补饲和玉米水平的影响，P小于0.05）。在试验2中，玉米水平为0.24%和0.74%体重/天，用0.0022%体重的DL-蛋氨酸（M）替代B。总干物质采食量分别为体重的2.85%、3.00%、2.99%、3.22%和3.34%（补饲和玉米水平的影响，P小于0.05），对照、LC、LCM、HC和HCM组的可消化有机物摄入量分别为3.78千克/天、4.24千克/天、4.30千克/天、4.84千克/天和5.12千克/天（补饲和玉米水平的影响，P小于0.05）。总体而言，在玉米补充料中添加瘤胃缓冲剂和DL-蛋氨酸对采食量和消化率的影响并不显著；然而，添加缓冲剂时，1.0%体重/天的玉米使干物质采食量增加幅度最大。
