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

doi:10.11686/cyxb2015404

Abstract

Abstract: In this study, the body weight of 215 Hu sheep and 60 Hu×(Dorper×Hu) hybrid lambs were measured 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 evaluate the hybrid effect of Hu×(Dorper×Hu) hybrid lambs. The results showed that the fitting degrees (R²) 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.

LA Yong-Fu, XI Rui, LI Fa-Di, WANG Wei-Min, ZHANG Xiao-Xue, LI Chong, LIU Ting, TANG De-Fu, LI Bao-Sheng. Growth model prediction and trend analysis of Hu sheep and their hybrid progeny in the arid and cold area of northwest China[J]. Acta Prataculturae Sinica, 2016, 25(9): 182-188.

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