Effects of yeast culture on production performance and blood biochemical indicators of dairy cows in high temperature environment in summer
This study aimed to explore the effect of yeast culture on the production performance and blood biochemical indicators of dairy cows in high temperature environment in summer.45 Holstein cows in the early lactation stage were selected and randomly divided into 3 groups.The 15 cows in the control group all received basal diets,while the experimental group of cows received basal diets with different proportions of yeast cultures added.Each cow in experimental group Ⅰ was fed 100g daily,and each cow in experimental group Ⅱ was fed 200g daily,with a total feeding time of 56 days.The results show:1)Compared with the control group,the dry matter intake,milk production,and lactose rate of the experimental group were significantly higher,and the number of somatic cells was significantly lower,and the experimental group Ⅱ was higher than the experimental group I,and the differences between the groups were significant.(P＜0.05).There was no significant difference in the milk fat rate and milk protein rate between the control group and the experimental group(P＞0.05);2)Compared with the control group,the levels of lactalbumin,T4,and T3 in the experimental group were significantly higher,and the levels of cortisol and BHBA The difference between the groups was significant(P＜0.05);3)Compared with the control group,the levels of IL-6 and HPT in the experimental group were significantly lower,and the levels of IgA and IgM were significantly higher.The difference between the groups was significant(P＜0.05).Based on the indicators measured in this experiment,adding yeast culture to the diet of dairy cows in high-temperature environments in summer will not only help improve their production performance,but also significantly improve the immunity of dairy cows and reduce inflammatory reactions.
yeast culturehigh temperature environmentdairy cowsproduction performanceblood biochemical indicators
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