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Background and Objective: Several studies confirm that the age of hens has atremendous impact on external and internal egg quality characteristics. Eggproduction could be at serious risk if egg quality characteristics and age ofhens are not seriously considered. This study was conducted to analyze thephenotypic correlations between some internal and external egg qualitycharacteristics in old laying hens. Materials and Methods: A total of 288 eggsof 85-week-old Hy-Line Brown laying hens were collected during 3 weeks andtheir internal and external egg characteristics were evaluated. Results:Phenotypic correlations between egg quality characteristics in old laying hensindicate a negative impact on shell and albumen quality but not affected yolkquality characteristics. Conclusion: This study helps to understand thatraising laying hens above 80 weeks would have a negative impact on egg qualitycharacteristics.

Phenotypic correlation between external and internal egg quality characteristics in 85-week-old laying hens