不同年龄·胎次和泌乳月对奶牛乳脂率的影响

目的]研究不同年龄、胎次和泌乳月对奶牛乳脂率的影响。方法]对宁夏平吉堡奶牛场1 500头成年奶牛乳脂率进行测定,研究不同年龄、胎次和泌乳月对奶牛乳脂率的影响。结果]奶牛平均乳脂率为3.64%,随着年龄的增长而逐渐下降,乳脂率由4岁的3.94%降至9岁的3.54%;奶牛平均乳脂率随着胎次的增加也逐渐下降,由1胎的4.03%降至8胎的3.26%;奶牛平均乳脂率随着泌乳月的延长而呈两头高中间低的变化趋势。结论]该研究结果对今后的奶牛生产具有一定的指导意义。

Effects of Dairy Cow Age,Fetal Times and Lactation Month on the Butter-fat Percentage

Objective] To research the effects of dairy cow age, fetal times and lactation month on the butter-fat percentage.Method] Butter-fat percentage of 1 500 adult cows was detected in Ningxia Pingjibao Dairy Farm.Effects of dairy cow age, fetal times and lactation month on the butter-fat percentage were researched.Result] The average butter-fat percentage of dairy cow was 3.64%, which gradually reduced as the age increased.The butter-fat percentage reduced from 3.94% at 4-year old to 3.54% at 9-year old.The average butter-fat percentage of dairy cow gradually reduced as the dairy cow enhanced, which declined from 4.03% of the first fetus time to the eighth fetus.The average butter-fat per-centage of dairy cow showed a change trend of peaking at both sides.Conclusion] This research provides certain guidance for the dairy cow pro-duction in future.