大豆皮替代产奶牛日粮精料中玉米与小麦麸对产奶性能的影响

Effect of Replacing Corn and Wheat Bran with Soyhulls in Dairy Cow Diets on Lactation Performance

本试验选用 4 2头荷斯坦产奶牛分为 3组 ,每组 1 4头。采用完全随机化区组设计进行试验。处理为 3种大豆皮替代水平 ,即 :大豆皮分别替代精料中 0 % (对照 )、2 5%和 50 %的玉米与小麦麸 ;区组 ( 4个 )为产奶牛的不同胎次和泌乳月。正式试验期 1 2周。结果表明 ,用大豆皮替代产奶牛精料中 0 %、2 5%和 50 %的玉米和小麦麸 ,日粮干物质、蛋白质进食量、日产奶量、4 %乳脂率校正奶产量、产奶的饲料转化效率、乳蛋白、乳糖、无脂固形物含量均没有明显变化 (P >0 .2 0 ) ,乳脂率随大豆皮替代水平的提高呈直线上升趋势 (P =0 .0 8)。以大豆皮替代精料中 2 5%和 50 %玉米与小麦麸饲粮喂奶牛 ,每千克产奶的饲料成本平均分别降低 0 .0 4 5和 0 .0

Forty-two lactating Holstein cows were used in a randomized complete block design. Soyhulls (SH) replaced corn and wheat bran in the concentrate mixture at 0%, 25% and 50%, respectively. The experimental period lasted 12 weeks. Replacement of corn and wheat bran with SH had no influence (P>0.1) on dietary DM, CP intake, milk production, 4% fat-corrected milk production, feed efficiency (FCM/kg DM intake), milk protein, lactose and solids not fat (SNF) content. Replacing corn and wheat bran with SH in the diet at 25% and 50% tended to increase milk fat content, but decreased the feed cost per kg of 4% FCM yield by 0.045 and 0.057 yuan (RMB), respectively.