Abstract
The influence of the sex-linked recessive dwarf gene (dw) was evaluated through 8 and 9 backcross generations in the Athens Randombred and Athens-Canadian Randombred populations, respectively, to assess the influence of this gene in control population backgrounds. Reproduction of both populations was by mating heterozygous (Dw/dw) males to normal females, followed by mating normal males to dwarf females in alternate generations. Backcrosses, therefore, produced full sib normal and dwarf females for evaluation in alternate generations.The relative depressive effect of the dw gene on body weight was less at 8 weeks of age than at latter ages. The depressive effect of dw on shank length at 16 weeks of age was similar to the depressive effect of this gene on 8-week body weight. Dwarfism did not appear to delay sexual maturity in the control population backgrounds used in this study, and no significant differences were noted in egg production (between normal and dwarf sibs). Dwarf pullets laid fewer defective eggs than their normal sibs.
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