新疆褐牛乳脂率变化规律初探

Preliminary Study on Variation of Fat Percentage in Xinjiang Brown Cattle

在新疆乌鲁木齐种牛场新疆褐牛繁育中心根据牛场记录选择1～10泌乳月的142头母牛,采集奶样测定,结果表明:新疆褐牛的平均乳脂率为3.63%,随着年龄的增长而逐渐下降,由3岁的3.71%下降到8岁的3.05%;随着泌乳月的延长,乳脂率呈曲线变化;而且乳脂率随产乳量的增加而呈下降的趋势。

The 142 lactating cows of 1 to 10 lactation month from Urumqi breeding cattle field were selected according to records, milk sample was collected and determined. Results showed that： milk fat percentage of Xinjiang brown cattle was 3.63 percent, with age increases gradually, the fat percentage from 3.71 percent of 3-year-old to 3.05 percent of 8-year-old; as the extension of lactation month, fat percentage showed curve change, and milk fat percentage with the increase in production was a downward trend.