不同性别的川南山地黄牛生长曲线分析

Analysis of Growth Curve of Male and Female Chuannan Mountainous Cattle

试验测定了三峡库区不同性别的川南山地黄牛的体尺体质量,运用Logistic、Gompertz和Brody模型进行了生长曲线分析.结果表明:公牛各月龄的体尺体质量均高于母牛,3种模型都能很好地拟合公、母牛的体尺体质量生长曲线,除公牛的体直长用Gompertz模型、母牛的体高用Logistic模型拟合较好外,其余公、母牛的体尺体质量用Brody模型拟合较好.公牛的体高生长速度一直高于母牛;而体直长、胸围、管围、体质量在前期母牛快于公牛,而后期公牛更快.生长强度最高的为体质量,其次是胸围、体直长、最后是体高.公、母牛早期生长强度明显高于后期.

The body lengh and weight of male and female Chuannan mountainous cattles were studied.Logistic and Gompertz and Brody model were used to fit the growth curves.The results indicated that the body length and weight of bull were more than those of cow.Three models could be fitted very well for cattles.Gompertz model was better for body length of bull,and Logistic model was better for body height of cow.The others were fitted well with Brody model.The growth rate of body height of bulls was always higher than cows,but cows growed faster than bulls in body length,heart girth,cannon circumference and body weight in an early phase,while bulls were faster at later stage.The highest growth strength was body weight,and heart girth,body length next,finally was body height.The growth strength in an early phase was higher than later stage for male and female Chuannan mountainous cattles.