GENETIC RESPONSE OF SOME BODY MALES MEASUREMENTS AND REPRODUCTION FOR GIMMIZAH CHICKENS SELECTED FOR BODY CIRCUMFERENCE | ||
| Egyptian Poultry Science Journal | ||
| Article 5, Volume 41, Issue 3, September 2021, Pages 507-523 PDF (807.64 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/epsj.2021.195779 | ||
| Author | ||
| Nabile Galabe Boutrous | ||
| Anim. Prod. Res. Inst., Agric. Res. Cent, Egypt | ||
| Abstract | ||
| this experiment was conducted on Gimmizah (GM) chickens aiming to investigate the effect of selection for breast circumference at twelve weeks of age through six generations on some physical characters of males and hatchability besides estimating some genetical sire parameters among the selected generations. Two hundred and twenty hens besides twenty two males were randomly chosen from (GM) flock and considered as base population (G0) composing pen's families (10hens and one male / pen). Day-old chicks produced from G0 were wing-banded and selected for breast circumference (BC) at 12-wk of age within families. Chickens were selected as parents of the next generation and continued throughout five generations. A total number of 6750 hatching eggs representing the six experimental consecutive generations were used for hatching trials. Data were collected for some physical parameters of GM males at 1 day, 8, 12, 25 and 45 weeks of age for six generations. Hatched male body weights (BW1) were significantly higher for selected line among G0, G4 and G5 generations compared to those for control one. Selection for chicken BC significantly improved fertility percentage with advanced generations. Moreover, fertility percentage was significantly increased for selected chickens compared to those for control line at fifth generation. Heritability estimates seem to be high for all body weights at studied ages through the sixgeneration ranked between 0.50 among the most ages and generations with 0.97 for BW8 and BW12at G4.Also, BC represented high estimates of among the ages and generations ranged between 0.32 for BC12 at G5 and 0.69 for BC12 at G0.Genetic correlations between fertility and body weights among the studied generations were low differed between 0.10 up to 0.34, with value of 0.28 for BW1 at G5. It is concluded from this study that fertility trait should be taken into consideration during selection of breast circumference, besides other breast measurements such as breast length and width should be included in the coming genetic selection program. | ||
| Keywords | ||
| Chickens- Selection; Heritability- Fertility - Breast | ||
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