Abstract: The effect of the laying hens age on some egg quality traits and their correlation and coefficient of determination were investigated. Three hundred (300), 22 - 38 weeks old ISA-Brown laying hens reared in battery cages under confined system were used in the study. Sixty eggs were randomly collected nine (9) times at different ages; 30 eggs in morning hours and similar number in late afternoon. Egg shape index, egg weight, yolk weight, albumen weight, yolk to albumen ratio, shell weight and shell thickness were examined. Correlation and coefficient of determination were calculated using linear equation. The effect of laying hens age on all egg quality traits showed a significant (p treatment influence. Moreover, correlation and coefficient of determination between age and egg quality traits showed a significant (p 0.01) treatment effect. Laying hens age determines egg quality traits as indicated by a positive correlation and hence it is highly recommended in selection programs for genetic improvement.
Key words: Poultry, Laying hen's Age, Egg Quality traits, Correlation, Determination Coefficient
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