The effect of age on the yolk:albumen (Y:A) ratio was studied for eggs obtained from Hy-Line W36 and Arbor Acres hens. Albumen weight was more closely associated with egg weight (EW) than yolk weight for both commercial layers and broiler breeder hens. A small positive relationship between EW and Y:A ratio was found. A significant increase in Y:A ratio was evident in older flocks from both breeds.
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Hussein et al. (1993) studied this question.
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