摘要:
为了探究戴云山羊早期生长发育规律,测定了戴云山羊从初生到6月龄的各项体重、体尺指标,分别采用Von Bertalanffy、Gompertz 和Logistic 3种非线性生长模型拟合其生长曲线。结果表明:公、母戴云山羊在1月龄前生长较快,2~5月龄生长速度变缓,5~6月龄生长速度呈现增快趋势。通过比较拟合度(R2)发现3种曲线模型拟合度达到0.97以上,其中Von Bertalanffy模型的拟合结果更接近实际测量值,拟合效果最佳。进一步比较不同性别戴云山羊Von Bertalanffy 模型拟合参数,结果发现各时期的公羊体重均高于母羊,但公羊拐点月龄、拐点体重均低于母羊。戴云山羊公羊的Von Bertalanffy模型方程为:W =20038.421(1-0.485e-0.227t)3,母羊的Von Bertalanffy模型方程为:W=21272.581(1-0.510e-0.198t)3。
关键词:
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戴云山羊
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生长曲线
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体重
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模型
Abstract:
To study the early growth of Daiyun goat, a Fujian local goat breed, the body weight and body size of lambs from zero to six months after birth were measured. Three kinds of nonlinear models of Von Bertalanffy, Gompertz and Logistic were used to investigate the growth curve,respectively. Male and female Daiyun goats growed the fastest during the first month, while the growth rate went down during the second to fifth month, then rose up during the fifth to sixth month. The results showed the growth curve fitted well with these three models and the R2 was above 0.97, but the Von Bertalanffy model was much closer to the actual observed values. The fitting parameters of Von Bertalanffy model between genders were also compared, the results told that male Daiyun goats showed higher body weight than female Daiyun goats for each month, but the male Daiyun goat showed lower inflection age, inflection point weight than the female ones. The Von Bertalanffy model equation for male and female Daiyun goat was W=20038.421(1-0.485e-0.227t)3 and W=21272.581(1-0.510e-0.198t)3,respectively.
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