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The effect of sex-linked dwarf gene was investigated through comparison of  dwarf hens with their full-sib normal sisters obtained by mating heterozygous  males (DW/dw) to normal females (DW/_) from line F (used as maternal form for  production of slow-growing colored chickens) with respect to the following  traits: body weight, shank and keel length at 40 weeks of age, age of sexual  maturity (at 50 % production), egg production, egg weight, feed intake, feed  utilization, livability, fertility, hatchability and egg quality  characteristics. The results demonstrated that the dw gene caused  statistically significant reduction of body weight by 29.15 %, shank length  by 20.17 %, keel length by 7 % and egg weight by 5.72 % (p<0.001). The hens  with normal genotype attained sexual maturity 7 days earlier (p<0.001), but  nevertheless, rate of lay was similar to that of mini forms. There were no  considerable differences between both genetic groups with respect to  livability percentage over the production cycle. Dwarf hens consumed by 23.38  % less feed (p<0.01) than normal sized hens and converted nutrients more  efficiently by 12.69 % (p<0.05). The presence of dw gene in hen genotype  increased the eggshell percentage, reduced egg yolk and albumen weights and  had no effect on their quality. The positive effect of the sex-linked dwarf  gene on economically important traits - feed intake and feed conversion,  hatchability of eggs set, is a prerequisite for the development of more  efficient broiler breeder hens for production of slow-growing chickens.

Effect of sex-linked dwarf gene on exterior appearance, productive performance and egg characteristics in a colored broiler dam line