Effects of active yeast on milk yield,milk composition and blood indexes of cold season lactating yaks
To investigate the effects of active yeast on milk yield,milk composition and blood indexes of cold lactating yaks,16 lactating yaks were randomly divided into two groups:control group and active yeast group(80 g/head·d).The experiment lasted for 6 weeks.The results showed as follows:(1)Compared with the control group,the milk yield in active yeast group on day 18 was increased by 0.45 kg(P<0.05),and the percentage of milk protein,milk fat and milk sugar on day 35 were increased by 0.68,0.49,0.11 percentage points,respectively(P<0.05).(2)Compared with the control group,blood glucose(GLU)content in active yeast group was increased by 0.26 mmol/L(P<0.01).On day 35,albumin(ALB)and triglyceride(TG)levels were increased by 4.34 g/L(P<0.01)and 0.08 mmol/L(P<0.05),respectively,and urea nitrogen(UN)content decreased by 0.55 mmol/L(P<0.01).(3)Compared with the control group,in active yeast group,immune globulin G(IgG)content on day 18,immuneglobulin A(IgA)content and immuneglobulin M(IgM)content on day 35 were increased by 1.26 pg/mL(P<0.05),0.04 g/L(P<0.05)and 0.23 g/L(P<0.01),respectively.The results indicated that active yeast could improve the digestibility and utilization of dietary nutrients such as energy and protein by regulating rumen environment and microflora structure,thereby improving the body immunity and improving lactation performance and milk composition.
active yeastlactating yakmilk productionmilk compositionblood index
万方数据
维普
