CAJ | 학술논문

选择年龄、胎次、产奶量和泌乳时间相近的30头泌乳前期荷斯坦牛，随机分为3组（试验Ⅰ组、Ⅱ组和对照组），每组10头。在试验组精料补充料中添加300g／t和600g／t的非淀粉多糖酶制剂，研究其对奶牛产奶量和乳成分的影响。结果表明，与对照组相比，试验Ⅰ、Ⅱ组奶牛产奶量分别提高了1．18kg／d和1．23kg／d，乳脂率分别提高了0．03和0．39个百分点，乳蛋白率分别提高了0.01和0．05个百分点，体细胞数分别下降15．86万个／mL和14．6375个／mL，但差异均不显著（P〉0．05）；在泌乳前期的奶牛日粮中添加外源非淀粉多糖酶制剂具有促进奶牛泌乳、改善乳成分的趋势。
선택년령、태차、산내량화비유시간상근적30두비유전기하사탄우，수궤분위3조（시험Ⅰ조、Ⅱ조화대조조），매조10두。재시험조정료보충료중첨가300g／t화600g／t적비정분다당매제제，연구기대내우산내량화유성분적영향。결과표명，여대조조상비，시험Ⅰ、Ⅱ조내우산내량분별제고료1．18kg／d화1．23kg／d，유지솔분별제고료0．03화0．39개백분점，유단백솔분별제고료0.01화0．05개백분점，체세포수분별하강15．86만개／mL화14．6375개／mL，단차이균불현저（P〉0．05）；재비유전기적내우일량중첨가외원비정분다당매제제구유촉진내우비유、개선유성분적추세。
A total of thirty cows were selected and divided into 3 treatments according to lactation date and milk yield. There were 10 cows in each treatment. We supplemented 0g/t, 300g/t and 600g/t enzyme into feed to study the effects of enzyme on milk yield and composition in early-lactation dairy cows. The result found that supplementing enzyme could improve milk yield in early-lactation dairy cow. Milk yield improved 1.18kg/d and 1.23kg/d respectively in treatment than that of control. But it was not significant difference（P〉0.05）. Milk fat improved 0.03 and 0.39 percent point respectively in treatment than that of control. Milk protein improved 0.01 and 0.05 percent point respectively in treatment than that of control. Milk somatic cell count decreased 15.86× 10^4/mL and 14.63 ×10^4/ mL respectively in treatment than that of control. But it was not significant difference（P〉0.05）. This result showed that supplementing enzyme could improve milk yield and milk composition in ration of early lactation dairy cow. It has a relationship with adding quality of enzyme.