Abstract: The altiplano breed, Tibetan chicken which are raised in Beijing was studied on the body conformation and growth rhythm, and the two curves of Logistic and Gompertz model were used to fit the growth model. The results indicate that cocks and hens raised in plain grow basically unanimous before the age of 4 weeks, but the cock grows faster than the hens obviously after age of 4 weeks. The fitting results of two kinds of models are very good, especially Gompertz model is better. The growth inflexion of the cock and hen are the age of 75.69 days, and 61.91 days respectively. The adult live weight of the cock is higher than the hen notably, but the day of inflexion is late to the hen relatively.

Key words: Tibetan Chicken, Body conformation, Fitting growth model