  Background and Objective: Several studies confirm that the age of hens has a
tremendous impact on external and internal egg quality characteristics. Egg
production could be at serious risk if egg quality characteristics and age of
hens are not seriously considered. This study was conducted to analyze the
phenotypic correlations between some internal and external egg quality
characteristics in old laying hens. Materials and Methods: A total of 288 eggs
of 85-week-old Hy-Line Brown laying hens were collected during 3 weeks and
their internal and external egg characteristics were evaluated. Results:
Phenotypic correlations between egg quality characteristics in old laying hens
indicate a negative impact on shell and albumen quality but not affected yolk
quality characteristics. Conclusion: This study helps to understand that
raising laying hens above 80 weeks would have a negative impact on egg quality
characteristics.
