Genetic Analyses of Generation Means For A Cross Between Two Local Breeds Of Chickens:  DjDj- Comparisons Between F3 and Backcrosses For Egg Production Traits

Dr. Dr. R.Sh. Abou El-Ghar

Authors

Dr. Dr. R.Sh. Abou El-Ghar

bandarah gimmizah maturity yielded

Abstract

Comparisons between F3 and Backcross combinations derived from Gimmizah x Bandarah cross were used to estimate additive and dominance effects and the average level of dominance, which control the inheritance of egg production traits. Genetic variance components were estimated using Designs ІІ and Ш. Both analysis determined that large positive additive genetic variations were found for age at sexual maturity 20.4, egg number at the first 90 d. of production 149.8 and egg number at 52 weeks of age 848.7 in backcross generations compared with the same traits in F3 generation (-52.0, 14.8 and 9.9), respectively. On the other hand small positive additive genetic variances were found for body weight at maturity (0.0144) and egg weight at maturity (0.281) in backcross generations, the corresponding values in F3 generation were -0.018 and -9.87, respectively. These results indicate that the parents Gimmizah and Bandarah contain a high proportion of additive genes for these traits, which accumulated in backcrosses. Furthermore, the F3 generation yielded higher positive dominance variance components for age at sexual maturity 287.7 and egg weight at maturity 48.6 than the corresponding variances in backcrosses 8.3 and 8.1, respectively.

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Genetic Analyses of Generation Means For A Cross Between Two Local Breeds Of Chickens: DjDj- Comparisons Between F3 and Backcrosses For Egg Production Traits. (2013). Global Journal of Science Frontier Research, 13(11), 39-43. https://journalofscience.org/index.php/GJSFR/article/view/

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Author Biography

Dr. Dr. R.Sh. Abou El-Ghar

Dr. Reda Abou El-Ghar is a dedicated researcher in the field of poultry production and animal science, affiliated with the Animal Production Research Institute (ARC) under the Ministry of Agriculture in Egypt. Based in Alexandria, Egypt, Dr. Abou El-Ghar has contributed significantly to the genetic improvement of local chicken breeds, with a particular focus on egg production traits and hatchability. His notable works include studies on combining ability estimates for egg production traits, genetic analyses of generation means for crosses between local chicken breeds, and predictive models for hatchability based on egg quality traits. With a Ph.D. in Poultry Production, Dr. Abou El-Ghar has authored multiple research papers and serves as a reviewer for scientific journals, reflecting his commitment to advancing agricultural science and animal genetics.

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