SELECTION AND CORRELATED RESPONSE FOR EGG PRODUCTION TRAITS IN INSHAS AND SILVER MONTAZAH STRAINS OF CHICKENS | ||||
| Journal of Animal and Poultry Production | ||||
| Article 9, Volume 31, Issue 4, April 2006, Page 2009-2025 PDF (3.08 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2006.235472 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| K. SaIeh,1; H. H. Younis1; F. A. Abd El-Ghany2; Enayat A. Hassan2 | ||||
| 1Poultry Prod. Dept, Fac. of Agriculture, Kafr EL-sheikh, Tanta Univ. | ||||
| 2Anim. Prod. Res. Inst, Agric. Res. Center, Ministry of Agric., Dokki. Egypt | ||||
| Abstract | ||||
| Two local strains of chickens selected two generations for increasing egg number up to 40 wks of age (lnshas strain) and egg weight at 40 wks of age (Silver Montazah strain) were used to study the changes in egg number and egg weight after selection and estimating correlated responses and genetic parameters of some economic traits. The results of selection for egg number at 40 wks of age showed significant differences between selected and control lines as well as among generations. The realized and expected response were 15.2 and 5.33 eggs over two generations. The direct selection for egg weight at 40 wks of age showed also highly significant differences among generations as well as selected and control lines. Moreover, the realized and expected response were 3.70 and 3.19gm over two generations. Heritability estimates for egg number at 40 wks of lnshas strain based on sire, dam and sire plus dam components of variance were 0.2, 0.32 and 029, respectively, the corresponding estimates of egg weight at 40 wks of age in Silver Montazah strain were 0.52, 0.92 and 0.72, respectively. Negative genetic and phenotypic correlations were observed between egg number at 40 wks of age and age at sexual maturity, duration period of the first ten eggs, egg weight and feed conversion. However, positive correlations between egg weight at 40 wks of age and body weight at sexual maturity, age at sexual maturity, duration period of the first ten eggs and egg mass, while negative correlations with egg number and feed conversion were detected. Generally, according to the results of the present experiment, it could be noticed that selection for increasing egg number at 40 wks of age in lnshas strain increased egg number and egg mass as well as improved feed conversion and reduced age at sexual maturity and duration period of the first ten eggs. However, selection for high egg weight at 40 wks in Silver Montazah strain increased egg weight, egg mass, age at sexual maturity and duration period of the first ten eggs, and improved body weight and feed conversion. Finally, selection program is suggested to be put to improve the egg productive performance of lnshas strain (as a new local strain) and crossing it with Silver Montazah strain to produce a commercial hybrid used in rural production. | ||||
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