Egg number was slightly higher for naked neck birds in the heated group, although not significantly. The effect of genotype at Na locus was consistent at both temperature regimens for food consumption, mean weight of the egg and its components, and albumen height; on the other hand, there was a significant or highly significant genotype X environment interaction for adult body weight, residual food consumption (corrected for body weight and egg mass), mean egg and yolk weight and yolk /albumen ratio.
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