Analysis of Growth and Development Models of the Gansu Meat Sheep New Breed Population

The Gompertz and Logistic models were used to study the production potential of Gansu meat sheep new breed population,so as to provide theoretical basis for meat sheep breeding. The results showed that the fitnesses( R2) of two kinds of models were above 0. 91,the Gompertz model had higher R2value and better predicting effect towards bodyweight. The Gompertz model was constructed for the Gansu meat sheep new breed population. The body weight at inflection age were 24. 06 and 16. 16 kg,inflection age were 2. 73 and 1. 80 months,the maximum monthly weight were 7. 92 and 7. 64 kg,the instantaneous growth rate were 7. 27 and 5. 18, the relative growth rate were 0. 21 and 0. 17,respectively. The results proved that the Gompertz model could be used to guide the production of Gansu meat sheep new breed.