川南山地黄牛二元杂交牛与三元杂交牛生长发育研究

Study on growth and development of two-way crossbred and three-way crossbred of Chuannan mountainous cattle

为了研究川南山地黄牛二元杂交牛和三元杂交牛的生长发育情况,试验测定了西红本牛和红本F1牛初生、3月龄、6月龄、12月龄、18月龄体尺、体重,并运用Logistic模型对生长曲线进行拟合。结果表明:三元杂交西红本牛各月龄体尺、体重均高于二元杂交红本F1牛;红本F1牛在3～6月龄时日增重最高,西红本牛在12～18月龄时日增重最高;红本F1牛和西红本牛体尺的增长速度随日龄的增加逐渐变慢;用Logistic模型拟合杂交牛体尺、体重生长曲线,拟合度在90%以上,西红本牛的极限体尺、体重均高于红本F1牛。说明川南山地黄牛三元杂交效果优于二元杂交。

To study the growth and development of two - way crossbred and three - way crossbred for chuannan mountainous cattle, the body sizes and weights were measured in two -way crossbred Of Red Angus x Chuannan mountainous cattle（ RC ）and three- way crossbred of Sim- mental x Red Angus ~ Chuannan Mountainous cattle（SRC） at 0,3,6,12, lg month - old of age. Logistic growth model was used to fit growth curve of hybrid cattles. The results showed that the body sizes and weights at birth to 18 month - old of age of SRC were higher than those of RC. The average daily gains of RC from 3 to 6 months of age were highest. However, the body weights of SRC aged 12 to 18 month were highest. The growth speeds of body sizes in RC and SRC became slow gradually with the increase of the age of day. Logistic growth model could be fitted very well to the growth curve of the body sizes and weights of hybrid cattles, and its fitting degree was more than 90%. The limit body sizes and weights of SRC were more than those of RC. The results indicate that effect of three - way crossbreed is superior to that of two - way crossbreed in Chuannan mountainous cattle.