Genetic parameter estimates for early growth traits in Naeini goat
Hasan Baneh A C , Mojtaba Najafi B and Ghodrat Rahimi BA Young Researchers Club, Sanandaj Branch, Islamic Azad University, Sanandaj, Iran.
B Department of Animal Science, Sari Agricultural Science & Natural Resources University, Sari, Iran.
C Corresponding author. Email: hasanbaneh@gmail.com
Animal Production Science 52(11) 1046-1051 https://doi.org/10.1071/AN12045
Submitted: 7 February 2012 Accepted: 15 June 2012 Published: 2 August 2012
Abstract
The present study was carried out to estimate variance components for growth traits in Naeini goats. Bodyweight records were collected for two flocks under supervision of the Agriculture Organisation of the Esfahan province between 2000 and 2007. Investigated traits were birthweight (BW; n = 2483), weaning weight (WW; n = 1211) and average daily gain from birth to weaning (ADG; n = 1211). Environmental effects were investigated using fixed-effect models, while (co)variance components and genetic parameters were estimated with single- and three-trait analyses using REML methods and WOMBAT software. Six different animal models were fitted to the traits, with the best model for each trait determined by log-likelihood ratio tests (LRT). All traits were significantly influenced by herd, birth year, sex of the kid, birth type and dam age (P < 0.01). On the basis of LRT, maternal permanent environmental effects (c2) were significant for WW and ADG, while BW was affected only by direct genetic effects. Direct heritability estimates for BW, WW and ADG were 0.25 ± 0.05, 0.07 ± 0.06 and 0.21 ± 0.11, respectively. The estimate of c2 was 0.16 ± 0.06 for both WW and ADG. Estimates of genetic correlation for BW–ADG, BW–WW and ADG–WW were 0.49, 0.61 and 0.94, respectively. The estimated phenotypic correlations were positive and were between 0.03 (BW–ADG) and 0.95 (ADG–WW). These results indicate that selection can be used to improve growth traits in this goat breed.
Additional keywords: genetic correlation, heritability, maternal effect.
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