不同预混料及缓冲剂对奶牛泌乳性能的影响

Effects of different premix feed and buffer on milk production of dairy cows

选择6头荷斯坦奶牛研究添加预混料和复合缓冲剂对奶牛产奶量和乳脂成分的影响。试验采用3×3重复拉丁方设计,分3组处理:(Ⅰ)基础日粮+1%市售商品预混料(对照组);(Ⅱ)基础日粮+1%新型预混料;(Ⅲ)基础日粮+1%新型预混料+复合缓冲剂。结果表明:1)试验Ⅲ组的粗蛋白质、粗脂肪、中性洗涤纤维和酸性洗涤纤维的表观消化率均高于其他两组,但差异不显著(P>0.05)。2)试验Ⅲ组产奶量为23.98kg/d,比试验Ⅰ组和试验Ⅱ组分别提高5.78%和3.67%,且差异极显著(P>0.05);试验Ⅲ组的乳脂率、乳蛋白、乳糖和非脂固形物均显著高于试验Ⅰ组和试验Ⅱ组。3)试验Ⅲ组奶牛血糖含量为86.83mg/dL,极显著高于试验Ⅰ组和试验Ⅱ组;试验各组血清尿素氮含量无显著差异(P>0.05)。

Six Holstein cows were used to study effects of premix and compound buffers on milk production and milk composition.The design was a replicative 3 × 3 Latin square,in which the three treatments were： （ Ⅰ ） basal diet ＋1% commercial premix; （ g ） basal diet ＋1% new type of premix; （ Ⅲ ）basal diet ＋1% the new type of premix＋compound buffers.The main results were as follows： 1 ） Apparent digestibility of crude protein （CP）, ether extracts （EE）,neutral detergent fiber （NDF） and acid detergent fiber were higher in group Ⅲ compared with other groups,but there were no significant difference（P 〈 0.05）.2） milk production was 23.98 kg/d for group Ⅲ ,it increased 5.78 % and 3.67 %compared with group Ⅰ and group Ⅱ,the difference was significant （P 〈 0.05）.In groupⅢ ,it increased significantly for milk fat percentages, milk protein percentages, content of lactose and solids-not-fat （SNF） compared with group Ⅰ and group Ⅱ .3）The content of blood sugar was 86.83 mg/dL for groupⅢ ,it significantly increased compared with group Ⅰ and group Ⅱ （P 〈 0.05）, and serum urea nitrogen didn＇t significantly differ among groups.