用大豆皮替代日粮中部分玉米对奶牛产奶量和乳成分的影响 摘 要 采用产奶牛饲喂试验研究大豆皮替代产奶牛日粮精料中部分玉米对产奶量和乳成分的影响。选用 36 头 1-6 胎次(平均 2.2 胎)、2-6 泌乳月(平均 4.9 月)的产奶牛，按组间奶牛上一胎次或母亲产奶量、泌乳月和胎次均一致的配对原则将试验牛分为对照组和试验组，每组18 头。试验采用完全随机区组设计方案进行。试验处理为大豆皮替代 30%玉米饲粮和不含大豆皮的对照饲粮。试验期 100 天，其中预饲期 10 天，正试期 90 天。结果表明，当以大豆皮替代奶牛日粮精料中 30%玉米时，奶牛日产奶量、4%乳脂率校正奶产量和乳脂率均较对照组有明显提高，而乳蛋白含量与对照组相比没有显著差异(P>0.20)。与对照组相比，虽然处理组日产奶量提高幅度差异不显著(P> 0.25)，但数量上提高 1.5 千克；由于乳脂率的差异，4%乳脂率校正乳的产量提高了 2.7 千克（P<0.08）。在奶牛饲粮中以大豆皮替代 30%玉米，使乳脂率提高了 0.32 个百分点 (P<0.05)。本试验结论是，在奶牛饲粮中用大豆皮替代 30%玉米时，可以提高产奶量和乳脂率，因而大豆皮可以作为奶牛饲养中较好的精料替代成分。关键词 大豆皮 产奶牛 产奶量 乳成分Effect of Replacing Corn Grains with Soybean Hulls in Lactating CowDiets on Milk Yield and Composition Abstract: A lactation trial using 36 lactating Holstein cows was conducted to investigate the effect of partial replacement of corn grains with soybean hulls (SH) in lactating dairy cow diets on lactation performance. The treatments were control (no addition of SH) and SH replacement of corn grains in mixed concentrate at 30% level. Replacing corn grains with SH at 30% level increased 1.5 kg milk yield and 2.7 kg 4% fat-corrected milk yield per day (P<0.08) respectively, although the increase in milk yield was not significant (P>0.25). When corn grains were replaced with SH, there was a remarkable increase in the percentage of milk fat (0.32 percentage; P<0.05), but no change in the percentage of milk protein (P>0.2). In conclusion, wh...
