Resumo

NARINC, D; KARAMAN, E  e  AKSOY, T. Estimation of genetic parameters for carcass traits in Japanese quail using Bayesian methods. S. Afr. j. anim. sci. [online]. 2010, vol.40, n.4, pp.342-347. ISSN 2221-4062.

The aim of this study was to estimate genetic parameters of some carcass characteristics in the Japanese quail. For this aim, carcass weight (C_w), breast weight (B_w), leg weight (L_w), abdominal fat weight (AF_w), carcass yield (C_P), breast percentage (B_P), leg percentage (L_P) and abdominal fat percentage (AF_P) were measured on approximately 500 quails (offspring of 60 sires and 180 dams). Gibbs sampling (GS) under a multi-trait animal model was applied to estimate heritability and genetic correlations. Genetic analyses were performed using MTGSAM (Multiple Trait Gibbs Sampling) software. Heritability estimates for all the traits were low to moderate. Point estimates (means of marginal posterior densities) of heritabilities for C_w, B_w, L_w, AF_w and C_P, B_P, L_P, AF_P were 0.42, 0.36, 0.34, 0.40 and 0.11, 0.18, 0.12, 0.29, respectively. Genetic correlations between the carcass parts (C_w, B_w, L_w, AF_w) were high and positive, ranging from 0.65 to 0.87. Direct selection for total carcass weight would increase its component traits. There were moderate to high negative genetic relationships between AF_P and L_P (-0.27), AF_P and B_P (-0.34), and AF_P and C_P (-0.89). Therefore, a decreasing AF_P in quail could be reached by direct selection for higher C_P.

Palavras-chave : Coturnix coturnix Japonica; genetic correlation; Gibbs sampling; heritability; slaughter.

        · texto em Inglês     · Inglês ( pdf )