Predicting the growth curve of body weight in Ettawa Crossbred Goats with Logistic and Gompertz mathematical models

Abstract

Ettawa crossbred goat is one of Indonesian native goat that kept for meat and milk productions. This research was aimed to predict the growth curve of body weight in Ettawa crossbred goat at 1 - 24 months of age with Logistic (L) and Gompertz (G) mathematical models. The number of 48 goats (24 males and 24 females) were used in this study and collected from Tambang District, Kampar Regency, Riau Province of Indonesia. Research showed that L and G models have the very high coefficient determination (R²) value (R²>0.90). The asymptotic weight (A) in animal studies was 53.34 kg (L) / 55.20 kg (G) for male and 36.99 kg (L) / 39.86 kg (G) for female. The inflection of weight (I_W) in animal studies was 26.67 kg (L) / 20.29 kg (G) for male and 18.49 kg (L) / 14.65 kg (G) for female. The inflection of age (I_A) in animal studies was 8.54 months (L) / 6.74 months (G) for male and 9.80 months (L) / 7.00 months (G) for females. In conclusion, the growth curve of body weight in Ettawa crossbred goats can be predicted with L and G models accurately.