不同酵母培养物对 泌乳奶牛血液指标和瘤胃微生物的影响.

Effect of different yeast cultures on blood indicators and rumen microflora of lactating dairy cows.

The purpose of the experiment was to study the effect of different yeast cultures (YC) on the blood indicators and rumen microflora of lactating dairy cows. 64 Holstein cows with similar parity, days in milk and milk yield were selected and randomly divided into four groups with 16 replicates in each group and one cow in each replicate. The cows in each group were fed with basal diet supplemented with 150 g/(head·d) YC1 and 80 g/(head·d) YC2, 100 g/(head·d) YC2 and 40 g/(head·d) YC3 (YC1 group, L-YC2 group, H-YC2 group, YC3 group). The experimental period was 60 d. The results showed that at 30 d, the triglyceride content in H-YC2 group was significantly higher than that in YC1 group and YC3 group (P<0.05). The cholesterol content in H-YC2 group and YC3 group was significantly higher than that in YC1 group (P<0.05). The concentration of insulin-like growth factor-1 in H-YC2 group was significantly lower than that in the other three groups (P<0.05), the content of urea nitrogen was significantly higher than that in the other three groups (P<0.05). The activity of alanine aminotransferase in H-YC2 group was significantly higher than that in L-YC2 group and YC3 group (P<0.05). The relative abundance of Fibrobacter in L-YC2 group was significantly lower than that in H-YC2 group and YC3 group (P<0.05). The relative abundance of cyanobacteria in the H-YC2 group was significantly higher than that in the other three groups (P<0.05). The experiment indicates that different yeast cultures has different effects on blood indicators and rumen microflora of lactating dairy cows. Considering blood indicators and rumen microflora, the effect of YC3 is close to that of YC1, and increasing the amount of YC2 does not produce additional effects. [ABSTRACT FROM AUTHOR]

试验旨在研究不同酵母培养物（YC） 对泌乳奶牛血液指标和瘤胃微生物的影响。选取64 头胎次、 泌乳天数和产奶量相近的荷斯坦奶牛, 随机分为4 组, 每组16 个重复, 每个重复1 头牛。各组泌乳奶牛分别饲喂 在基础日粮中添加150 g/(头·d) YC1、80 g/(头·d) YC2、100 g/(头·d) YC2 和40 g/(头·d) YC3 （即YC1 组、 L-YC2 组、H-YC2 组、YC3 组） 的日粮。试验期60 d。结果显示:30 d 时, H-YC2组奶牛血液中甘油三酯含量 显著高于YC1、YC3组（P<0.05）。H-YC2、YC3组奶牛血液中胆固醇含量显著高于YC1组（P<0.05）。H-YC2组 奶牛血液中胰岛素样生长因子-1 浓度显著低于其他3 组（P<0.05）, 尿素氮含量显著高于其他3 组（P<0.05）。 H-YC2 组奶牛血液中谷丙转氨酶活性显著高于L-YC2、YC3 组（P<0.05）。L-YC2 组奶牛瘤胃中纤维杆菌门相 对丰度显著低于H-YC2、YC3 组（P<0.05）;H-YC2 组奶牛瘤胃中蓝藻门相对丰度显著高于其他3 组（P<0.05）。 研究表明, 不同酵母培养物对泌乳奶牛血液指标和瘤胃微生物具有不同影响, 从血液生化和瘤胃微生物方面综合 考虑, YC3 与YC1 效果接近, 且增加YC2 添加量未产生额外效果. [ABSTRACT FROM AUTHOR]