Effects of Aspergillus oryzae culture on milk yield,milk composition,plasma biochemical,and immune indicators in lactating yaks during cold season
The study investigates the effects of supplementing Aspergillus oryzae culture on the milk yield,milk composition,plasma biochemical,and immune indicators of lactating yaks during the cold season.A single-factor experimental design was employed,16 lactating yaks with the similar parity,calving dates,and body weight were randomly divided into two groups with eight replicates in each group and one yak in each replicate.The control group was supplemented without additives,while the Aspergillus oryzae culture group received 100 g/(head·d)of Aspergillus oryzae culture during supplementation.The pre-test period was one week and the formal test period was five weeks.The results showed that compared to the control group,Aspergillus oryzae culture group significantly increased the milk fat percentage on the 18th day and the milk protein and lactose percentages on the 18th and 35th days(P＜0.05).On the 35th day,the Aspergillus oryzae culture group had an extremely higher plasma albumin(ALB)content(P＜0.01),and significantly increased glucose(GLU)and triglyceride(TG)contentrations(P＜0.05),while the plasma urea nitrogen(BUN)content was extremely reduced(P＜0.01).On the 18th and 35th day,compared to the control group,the Aspergillus oryzae culture group also had a significantly increased plasma immunoglobulin A(IgA)content(P＜0.05)and an extremely increased immunoglobulin M(IgM)content(P＜0.01).On the 18th day,the immunoglobulin G(IgG)content in Aspergillus oryzae culture group was extremely increased(P＜0.01).The results indicate that Aspergillus oryzae culture can improve the milk quality,immune function,and the utilization rate of dietary energy and protein in yaks during the cold season.
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