Egg Production Traits as Correlated Responses to the Selection for Immune Responses in Chickens.
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概要
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Egg production traits such as egg production, egg weight, egg shell thickness, albumen height and Haugh unit were compared between high responder (HR) and low responder (LR) lines of chickens which were selected for immune responses to rabbit serum albumin over five generations. These traits were also compared between B9/B9 and B11/B11 genotypes of the major histocompatibility B complex in HR line, since B9 and B11 alleles were segregated in the line, but B11 allele was fixed in LR line. From observations on egg production over 173 days, B11/B11 chickens produced significantly more eggs than B9/B9 chickens, whereas difference between the lines within B11/B11 genotype was small and not significant. Egg weight of LR line was a little heavier than that of HR line. Albumen height of HR line was a little higher than that of LR line. Egg shell thickness of LR line was larger than that of HR line. Haugh unit of LR line was larger than those of HR line. Associations of all the traits except egg production with B genotypes were not observed.
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