三种杂交牛的生长发育趋势对比分析

Comparisons of the Growth and Development of Three Kinds of Crossbred Cattle

[目的]为了掌握杂种牛生长发育的规律。[方法]对三种杂种牛的生长发育趋势和日增重的变化趋势进行了对比。[结果]表明：从公、母对比看，母牛生长发育速度略快于公牛，二者呈强的正相关；从三杂种对比看，夏杂F1增长最快，海杂F1次之，安杂F1最慢；从日增重变化趋势看，3～12月龄呈下降趋势，12～15月龄呈上升趋势，15～18月龄再次下降。[结论]说明生长发育是有波动趋势。

To understand the growth regulations of crossbred cattle, growth trends and daily gain of three kinds of crossbred cattle were compared. The growth rate of cow is faster than bull and There is strong positive related among them. Charolais crossbred cattle grows fastest, Hereford crossbred cattle grows faster and Angus crossbred cattle grows lowest. The daily gain descends from 3 to 12 months old, then gradually increases from 12 to 15 months old and descends again from 15 to 18 months old. The daily gain fluctuates obviously. These results could provide some references forthe production of crossbred beef.