Selection and correlated response for egg production traits in inshas and silver montazah strains of chickens [electronic resouce].

By: Contributor(s): Language: English Summary language: Arabic Description: p.749-770Other title:
  • الانتخاب والاستجابة المرتبطة لصفات إنتاج البيض في سلالتي دجاج انشاص والمنتزه الفضي [Added title page title]
Uniform titles:
  • Egyptian poultry science journal, 2006 v. 26 (II) [electronic resouce].
Subject(s): Online resources: In: Egyptian Poultry Science Journal 2006.v.26(II)Summary: Two local strains of chickens selected two generations for increasing egg number up to 40 wks of age (Inshas 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 to estimate 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 age in Inshas strain based on sire, dam and sire plus dam components of variance were 0.20, 0.32 and 0.29, 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 Inshas 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 Inshas strain (as a new local strain) and crossed it with Silver Montazah strain to produce a commercial hybrid used in rural production.
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Two local strains of chickens selected two generations for increasing egg number up to 40 wks of age (Inshas 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 to estimate 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 age in Inshas strain based on sire, dam and sire plus dam components of variance were 0.20, 0.32 and 0.29, 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 Inshas 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 Inshas strain (as a new local strain) and crossed it with Silver Montazah strain to produce a commercial hybrid used in rural production.

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