Bio
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.
Educational Journey
Ph.D.
Experience
Animal Production Research Institute
0 - 0Editors Role
Reviewer
GJSFR
2012 -Research
Genetic Analyses of Generation Means for a Cross Between Two Local Breeds of Chickens: 4- A Model for Hatchability Prediction as a Function of Some Egg Quality Trait
This study was undertaken to predict hatchability as a function of some physical characteristics of eggs in the third generation (F3) and backcrosses (BC1 and BC2) derived from crossing between two local developed strains of chickens (Gimmizah and Bandarah). The physical parameters used in this study were egg weight, egg shell thickness, egg shape index and yolk/albumin ratio as well as obtained hatchability. The relationships of these parameters in hatchability process were modeled by multiple linear regressions. The performances of the three genetic groups (F3, BC1 and BC2) were used to apply the modeling process. The following model output: Y = 241.6 + 1.126 x1 + 213.5 x2 + 79.54 x3 + 28.03 x4, where Y presents the predicted hatchability, 241.6 presents ï€ the intercept parameter (α) and the 1.126, 213.5, 79.54 and 28.03 are the slope parameters (βi) of egg weight (x1), shell thickness (x2), egg shape index % (x3) and yolk/albumin ratio (x4), respectively. Furthermore, the mention approach above confirms the existence of a highly significant relationship between the main regression parameters and predicted hatchability. Contrarily, determination coefficients adjusted (R²) were found to be 0.08, 0.11 and 0.13 in F3, BC1 and BC2, respectively. These R2 were closer to 0 indicates a regression line did not fit the data.
Genetic Analyses of Generation Means For A Cross Between Two Local Breeds Of Chickens: DjDj- Comparisons Between F3 and Backcrosses For Egg Production Traits
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.
Combining Ability Estimates for Egg Production Traits from Line X Tester Analysis
The present investigation was undertaken to study the combining ability for egg production traits using the line x tester mating design. Four local male lines (Baheij, Bj; Matrouh, Mt; Silver Montazah, SM and Golden Montazah, GM) and two commercial female testers (Lohman Brown, LB and Lohman Selected Leghorn, LSL) were used in this study. Combining ability estimates are important genetic attributes to chicken breeders in predicting improvement via hybridization and selection programs. The magnitude of specific combining ability (SCA) variance was evident from mean squares, indicating that egg production traits had been controlled by non-additive genes. However, among the four male lines, Silver Montazah (SM) showed maximum general combining ability (GCA) effects for number of eggs at 90 d., of laying (EN1), number of eggs at 180 d., of laying (EN2), number of eggs at 240 d., of laying (EN3), number of eggs till 52 wks., of laying (EN4), average egg weight at 52 wks., of laying (EW4) and egg mass throughout 52 wks., of laying (EM) studied traits. The second high GCA scoring parent for EN1, EN2, EN3, EN4, EW4 and EM was GM parental line.
