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http://dx.doi.org/10.5536/KJPS.2016.43.4.253

The Effect of Hen Age on Egg Quality in Commercial Layer  

Lee, Min Hee (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
Cho, Eun Jung (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
Choi, Eun Sik (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
Bang, Min Hee (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
Sohn, Sea Hwan (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
Publication Information
Korean Journal of Poultry Science / v.43, no.4, 2016 , pp. 253-261 More about this Journal
Abstract
Egg quality is a very important factor for both consumers and producers. Factors affecting egg quality include strain and age of hens; egg storage temperature, time, and humidity; laying season; and feeding. This study aimed to determine the effect of hen age and egg storage time on egg quality. A total of 700 eggs obtained from Hyline Brown commercial layers were used for this experiment, and they were separated into two hen age groups (30 vs. 60 weeks) with eight treatments and four storage times (day 0, 10, 20, and 30). The egg weight; shell color, thickness, and density; albumen height; Haugh unit (HU); yolk color; and the yolk and albumen pH and viscosity were measured for the egg quality assessment. The results showed that the age of the hen and egg storage time significantly affected almost all parameters of the internal and external egg quality. The shell thickness, albumen height, HU, yolk color, pH of yolk and albumen, and yolk viscosity significantly decreased with increasing hen age. The egg shell color was significantly lighter in eggs from 60-week-old hens than in those from 30 weeks-old hens. The egg weight; shell weight, thickness, and density; albumen height, HU; and albumen viscosity significantly decreased, but the yolk color and pH of the yolk and albumen increased with increasing egg storage time. The interaction effects between the storage time and hen age were significant in shell thickness, albumen height, yolk color, and yolk and albumen pH and viscosity. The eggs obtained from 60-week-old hens showed significantly lower shell thickness, albumen height, and HU values, which are considered typical egg quality measurements, than values of eggs from 30-week-old hens. Therefore, increasing hen age and egg storage time caused the deterioration of egg quality. In conclusion, this study demonstrated that hen age is the major factor affecting the quality of fresh eggs, whereas the storage time is the determinant factor affecting the quality of stored eggs.
Keywords
egg quality; hen age; storage time; Haugh units; commercial layer;
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Times Cited By KSCI : 2  (Citation Analysis)
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