乾华肉用美利奴羊生长规律及生长曲线拟合

乾华肉用美利奴羊是我国新培育的具有肉毛兼用特性的绵羊新品种,为了解舍饲条件下乾华肉用美利奴羊的生长发育规律,分别测定了0～24月龄乾华肉用美利奴公、母羊的体重,运用Logistic和Gompertz两种模型对其体重进行了拟合分析.结果表明:两种模型的拟合度R2均在0.95以上,拟合效果好,其中Gompertz模型对体重的拟合效果优于Logistic模型;乾华肉用美利奴羊公、母羊体重的拐点月龄分别为6.37和2.44个月,拐点体重为49.68和23.02 kg,最大日增重为218.59和249.38 g·d-1;各个月龄的公羊体重显著高于母羊,公、母羊体重绝对生长高峰分别出现在3～6和0～3月龄,与生长模型拟合结果相吻合.本研究结果为指导乾华肉用美利奴羊的早期选育和饲养管理提供了理论参考.

Growth law and growth curve fitting of Qianhua Mutton Merino

A new species in China, the Qianhua Mutton Merino is a breed of sheep that is farmed for both meat and wool. To understand the growth and development of Qianhua Mutton Merino sheep under indoor feeding conditions, the weights of rams and ewes aged 0～24 months were measured, and the results were subjected to fitting analysis using logistic and Gompertz models. The results showed that the degree of fitting R2 of the two models was above 0.95, with good fitting effects. The fitting effects of the Gompertz model were better than those of the Logistic model on body weight; the weight inflection point of rams and ewes were 6.37 months and 2.44 months, respectively, with a weight of 49.68 and 23.02 kg, and a maximum daily gain of 218.59 and 249.38 g·d?1, respectively; the weight of rams was significantly higher than that of the ewes at all ages. The absolute growth peaks of weight appeared in rams at 3～6 months and ewes at 0～3 months, which were consistent with the results of the growth model fitting. The results of this study provide a theoretical reference for establishing the early selection and breeding management strategies for the Qianhua Mutton Merino.