Growth curve fitting and growth rule prediction of Ross 308 broiler

In order to determine the growth and development rules of Ross 308 broiler, three growth patterns including Logistic, Gompertz and Von Bertalanffy were used to fit and analyze the growth of 120 Ross 308 broilers, and the different age average week gain, relative growth rate and feed conversion ratio were measured. The results showed that the fitting degrees of three models were all above 0.99. Analyzed from the indexes like inflection point weight and inflection point age, the fitted value of Logistic curve agreed with the actual measured value most, of which the fitting degree, inflection point weight and inflection point age were 0.99, 2 160.25 g and 5.77 weeks, respectively. The feed conversion ratios were from high to low in the two periods, and the lowest appeared in the later period. Comprehensive analyzed, Logistic curve most fit for Ross 308 broiler, and the best slaughter time was 6 weeks.