Non-genetic Effects and Genetic Parameters Estimation on Growth Traits of Indonesian Etawah Grade Goats
Abstract
Growth traits are important determinants of the efficiency and productivity of goat production systems. The Etawah Grade (EG) goat is a local Indonesian breed that is used for both milk and meat production. This study aimed to analyze the influence of non-genetic factors, estimate genetic parameters, and assess long-term genetic progress in growth traits of the EG goat at different ages. A total of 17,783 body weight records from 523 sires and 4342 dams were used to analyze non-genetic effects and estimate genetic parameters for growth traits in EG goats. The effect of non-genetic factors (sex, parity, season, year, and type of birth) on growth traits (body weight and average daily gain) was analyzed using a general linear model (GLM). Heritability and genetic trend were estimated using restricted maximum likelihood (REML) in the BreedR package from the R program. The results of this study showed that sex, parity, season, year, and type of birth had significant effects (p<0.01) on almost all growth traits. The heritability of growth traits was classified as low to moderate heritability (0.085-0.352). The genetic correlation in this study between all traits ranged from weakly positive to strongly positive (0.10-0.88). The estimated genetic trend in this study, based on estimated breeding values (EBV), was increased for all growth traits except 8MW and ADG8. These findings could provide a comprehensive longitudinal evaluation of growth performance and genetic progress in EG goats, offering practical insights to optimize selection strategies and improve breeding program effectiveness.
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References
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