肉羊不同杂交组合生长曲线模型筛选及分析OACSTPCD

To study the growth rule of mutton sheep in different hybrid combinations and evaluate the suitable hybridization model,the introduced breeds Suffolk,Australian white and Dorper sheep were used as male parents and Hu sheep as female parents in this experiment.The body weight of different hybrid combinations of Sahu,Aohu and Duhu from 1 to 6 months old were measured,and the growth of body weight was fitted by Brody,Logistic,Gompertz and Von Bertalanffy mathematical models,then the anal-ysis on body weight parameters and model estimates was conducted to evaluate heterosis.The results showed that the fitting degree(R2)of the four models were more than 0.95,among which the Von Berta-lanffy model was closest to the measured value of different hybrid combinations,suggesting best fitting degree.The weight at inflection point ranged from 7.64 kg to 9.98 kg,and the age of inflectional point was between 25 days to 35 days.The maximum daily gain of three hybrid combinations of Aohu,Duhu and Sahu was about 200 g,and no significant differences were observed among them(P＞0.05),which indica-ted that the growth and development of the three species were similar and suitable for popularization.Con-sequently,the Von Bertalanffy model accords with the actual growth condition of crossbred lamb,which could provide basis for the evaluation of the early growth performance of crossbreed mutton sheep.