The growth curve of Gompertz and logistic models in body weight of Ecotype Fulani Chickens (Gallus domesticus)

Abstract

This research aimed to estimate the growth curve of body weight in Ecotype Fulani (EF) chickens. Two growth curves of Logistic (L)and Gompertz (G) models were performed in this study. 211 birds were used in this study for growth curve analysis. Research showed that the coefficient of determination (R2) in both curves were similar (0.99). Hence, the standard error in G model was lower than L model in each sex group. The bird’s adult weight were 1575.96 g (male) or 1411.69 g (female) in L model and 2386.63 g (male) or 2250.30 g (female) in G model. The bird’s inflection weight was 787.98 g (male) or 705.85 g (female) in L model and 877.44 g (male) or 827.32 g (female) in G model. The bird’s inflection time were 13.58 week (male) or 15.58 week (female) L model and 18.57 week (male) or 13.89 week (female) in G model. The bird’s maximum growth rate were 78.80 g/wk (male) or 63.53 g/wk (female) in L model and 61.42 g/wk (male) or 74.46 g/wk (female) in G mode. It was concluded that the growth curve of G model was accurate to predict the body weight of EF chickens from hatching to adult age.