西北寒旱地区湖羊及其杂交后代生长发育模型分析

本试验测定了舍饲条件下的215只湖羊和60只湖杜湖[湖羊♂×(杜泊羊♂×湖羊♀)♀]杂交羔羊0~12月龄的体重,采用Gompertz模型和Logistic模型拟合了湖羊和湖杜湖杂交羔羊0~12月龄生长过程,并分析比较了生长参数及模型估计值,进而评价湖杜湖的杂交优势。结果表明,2种模型的拟合度(R²)均在0.96以上,拟合效果好,其中Gompertz模型拟合两个种群效果好于Logistic模型;湖羊公、母羔拐点月龄分别为2.55和1.73个月,拐点体重分别为17.00和13.14 kg;湖杜湖公、母羔拐点月龄均早于湖羊,公、母羔拐点体重分别相差0.74和2.66 kg,公、母羔累积生长均极显著高于湖羊(P<0.01)。结果说明湖杜湖早期生长强于湖羊,湖杜湖杂交效果显著。

Growth model prediction and trend analysis of Hu sheep and their hybrid progeny in the arid and cold area of northwest China

In this study,the body weight of 215 Hu sheep and 60 Hu×(Dorper×Hu)hybrid lambs were meas-ured from 0 to 12 months’age under the condition of barn feeding.The growth process of lambs was matched by Compertz and Logistic models.The growth parameter and estimated value of the models were analyzed to e-valuate the hybrid effect of Hu×(Dorper×Hu)hybrid lambs.The results showed that the fitting degrees (R 2 ) of the two models were over 0.96.The fitting effect of the Gompertz model was better than that of the Logistic model.The day of growth inflection points of Hu sheep rams and ewes were 2.55 and 1.73 months,while the weights at inflection point were 17.00 kg and 13.14 kg respectively.The day of growth inflection point of Hu ×(Dorper×Hu)hybrid lambs was earlier than that of Hu sheep,and the weights at inflection point were 17.74 kg and 15.80 kg respectively.The cumulative growth pole of Hu × (Dorper × Hu)was significantly higher than that of Hu sheep (P <0.01).These results indicate that the growth speed of Hu×(Dorper×Hu) hybrid lambs is faster than Hu sheep in early stages and that hybrid effects are evident.