不同水平复合益生菌制剂添加对奶牛生产性能、乳品质及体细胞数量的影响

Effects of different levels of compound probiotics on production performance, milk quality and somatic cells of dairy cows

为分析不同水平复合益生菌制剂添加对奶牛生产性能、乳品质及体细胞数量的影响,试验选择胎次、产奶量、泌乳天数相近的荷斯坦奶牛160头随机分成4个组,每个组4个重复,每个重复10头,1组饲喂基础日粮为对照组,试验2、3、4组每头奶牛分别在基础日粮中添加20、40、60 g/d复合益生菌制剂,预试验7 d,试验期为60 d。结果表明:(1)试验后的30、60 d,试验3、4组的平均产奶量较1相比分别提高16.0%、14.9%、25.6%、24.1%(P<0.05);(2)试验2、3、4组的4%乳脂校正、乳蛋白率、总固形物均高于1组(P>0.05);试验2、3、4组的尿素氮均低于1组(P>0.05);试验3、4组的乳糖率、乳脂率较1组分别提高14.6%、13.4%、5.0%、4.2%(P<0.05);(3)试验后的60 d,试验3、4组乳中体细胞数量较1组相比降低9.3%、7.1%(P<0.05)。综上,每头牛每天添加40 g复合益生菌制剂可以提高奶牛的生产性能、乳品质,减少体细胞数量。

In order to analyze the effects of different levels of compound probiotics on production performance,milk quality and somatic cells of dairy cows,160 Holstein dairy cows with similar parity,milk yield and lactation days were randomly divided into four groups,each group had 4 replicates,each replicate 10 cows.One group was fed with basic diet as control group.In the experiment 2,3 and 4 groups,each cow was fed with20,40,60 g/d compound probiotic preparation on the basic diet for 7 days,and the experimental period was 60 days.The results showed that:(1)30 days and 60 days after the experiment,the average milk yield of groups 3 and 4 were increased by 16.0%,14.9%,25.6%and 24.1%respectively compared with group 1(P<0.05).(2)4%milk fat correction,milk protein rate and total solids in groups 2,3 and 4 were higher than those in group 1(P>0.05),and urea nitrogen in groups 2,3 and 4 was lower than that in group 1(P>0.05).The lactose rate and milk fat rate in groups 3 and 4 were increased by 14.6%,13.4%,5.0%and 4.2%respectively(P<0.05).(3)On the 60th day after the experiment,the somatic cells in milk of groups 3 and 4 were 9.3%and 7.1%lower than that of group 1(P<0.05).In conclusion that 40 g compound probiotic preparation per cow per day could improve dairy cow’s production performance,milk quality and reduce somatic cells.