Broody traits including the number of nesting days, broody days, repeats of broody cycles, and duration of broodiness were calculated for each genotype. Because these data (excluding repeats of broody cycles) did not conform to a normal distribution, they were transformed with x′ = ln (x + 1). Genotypic effects were analyzed by 3-way ANOVA using the GLM procedure of the SAS Institute (2001) with genotype (G) as a fixed effect, and sire (s) and dam (d) as random effects, according to the following model: