酵母菌培养物对夏季高温环境奶牛生产性能和血液生化指标的影响

Effects of yeast culture on production performance and blood biochemical indicators of dairy cows in high temperature environment in summer

文章旨在探讨酵母菌培养物对夏季高温环境奶牛生产性能和血液生化指标的影响。试验将45头处于泌乳前期的荷斯坦奶牛随机分为3组,对照组15头奶牛饲喂基础日粮,试验组奶牛则饲喂添加不同比例酵母菌培养物的基础日粮,其中试验Ⅰ组每头奶牛每日添加100g,试验Ⅱ组每头奶牛每日添加200g,饲喂56d。结果显示:(1)与对照组相比,试验组干物质采食量、产奶量、乳糖率明显更高,体细胞数明显更低,且试验Ⅱ组显著高于试验Ⅰ组(P<0.05)。对照组和试验组奶牛的乳脂率、乳蛋白率无显著差异(P>0.05);(2)与对照组相比,试验组奶白蛋白、T4、T3水平明显更高,皮质醇和BHBA水组间差异显著(P<0.05);(3)与对照组相比,试验组IL-6、HPT水平明显更低,IgA、IgM水平明显更高,组间差异显著(P<0.05)。综合本次试验测定指标,将酵母菌培养物添加到夏季高温环境奶牛日粮中不仅有助于提升其生产性能,还能显著提高奶牛的免疫力,减少炎症反应。

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 groupⅠwas fed 100g daily,and each cow in experimental groupⅡwas 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 groupⅡwas 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.