The analysis of genetic and phenotypic properties of egg quality traits in Isfahan native fowl
Message:
Abstract:
Background
The study on genetic and phenotypic properties of egg quality traits is of high importance in native fowl breeding.
Objectives
The objective of present study was to estimate the heritability, genetic and phenotypic correlations of external and internal egg quality traits.
Methods
1024 eggs of 15th generation produced in Isfahan Breeding Center were collected and their internal and external quality traits were measured. Genetic and phenotypic parameters were estimated by 6 animal models using restricted maximum likelihood method.
Results
Heritability estimates for external egg quality traits ranged from 0.14 to 0.38 and it ranged from 0.11 to 0.25 for internal egg quality traits. For external egg quality traits, the highest positive genetic correlation was obtained between specific gravity and eggshell thickness (0.93), and the highest negative genetic correlation was observed between length and shape index (-0.81). For internal egg quality, the highest positive genetic correlation was observed between albumen height and Haugh unit (0.99) and the highest negative genetic correlation was observed between yolk diameter and yolk index (-0.54). The highest genetic correlation between external and internal egg quality traits was obtained between egg weight and albumen weight (0.92).
Conclusions
Results showed that improvement of external egg quality traits is possible through selection for egg specific gravity because this trait is a high heritable trait, and it also has favorable genetic correlations with other external egg quality traits and is easy to measure. For the same reasons, selection for higher yolk height will improve internal egg quality traits in Isfahan native fowl. Because of negative genetic correlation between egg specific gravity and yolk height, a selection index including both of these traits will improve internal and external egg quality traits in Isfahan native fowl.
Language:
Persian
Published:
Journal of Animal Science Research, Volume:26 Issue: 3, 2016
Pages:
165 to 177
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