Abstract: A total of 471 eggs were collected from 205 female Japanese quails
at 20 weeks of age in 3 consecutive days. The mixed model least-squares and
maximum likelihood computer programme of Harvey (1990) was applied to estimate
heritability, genetic and phenotypic correlations of egg quality traits. The
heritabilities of egg weight, egg length, egg width, egg shape index, shell
thickness, albumen width, albumen height, Haugh unit, yolk width and yolk height
were 0.37±0.09, 0.15±0.03, 0.40±0.17, 0.46±0.03,
0.52±0.03, 0.23±0.02, 0.27±0.14, 0.30±0.08, 0.11±0.03
and 0.11±0.02, respectively. The genetic correlations among egg quality
traits ranged from -0.13 to 0.97. The phenotypic correlation between egg weight
and albumen width, albumen height, yolk width and yolk height were positive
and significant (P<0.001). The results indicate a Haugh unit that can support
embryo development and successful hatching. It also suggests that selection
would be effective in improving some egg quality traits. |