The Effects of Bacillus amyloliquefaciens on Lactation Performance,Serum Biochemistry and Immune Function in Dairy Cows
[Objective]In order to study the effects of Bacillus amyloliquefaciens on milk yield,milk composition,serum biochemical and immune functions of lactating cows.[Method]36 China Holstein cows with healthy body,milk yield of(35.15±2.10)kg/d,parity of 2.5±0.2 and lactation days of(102±5)d were selected and divided into 3 groups by single factor random design,with 4 replicates in each group and 3 cows in each replicate.The control group was fed with basal diet without Bacillus amyloliquefaciens,and the two experimental groups were designed to be fed with basal diet+150 mg/kg(150 mg/kg group)and basal diet+200 mg/kg(200 mg/kg group)respectively,once a day.The pretrial period is 3 d,and the normal trial period is 56 d.The results showed that the milk protein rate of 150 mg/kg group and 200 mg/kg group increased significantly(P＜0.05).Compared with the control group,the total protein,uric acid and alanine aminotransferase in 150 mg/kg group were significantly increased(P＜0.05),and the urea nitrogen in 200 mg/kg group was significantly decreased(P＜0.05).[Result]Compared with the control group,the contents of IgA and IgM in 150 mg/kg group and 200 mg/kg group all increased correspondingly,among which the IgA and IgM in 150 mg/kg group increased significantly by 50.69%(P＜0.05)and 33.64%(P＜0.05),and the γ-interferon in 150 mg/kg group increased significantly(P＜0.05).[Conclusion]In summary,adding Bacillus amyloliquefaciens to the diet can improve the lactation performance of dairy cows and enhance the immune function of the body.
Bacillus amyloliquefacienslactating cowmilk yieldmilk componentserum biochemistryimmunologic function
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