Abstract
Three inbred lines K1, K2 and K3 were developed from crossbreds by one-sire sib matings. The mean inbreeding coefficients of the lines ranged from 0.33 to 0.42 for the last generation. Regression coefficients of hatchability on inbreeding coefficient ranged from -0.27 to -0.87 for the individual lines, and -0.53 for the pooled estimate.
The estimated lower and upper limits of lethal equivalents per zygote were 0.84 to 2.92 and 1.22 to 2.92, respectively. The estimated values of B/A ratio were high in two of the three lines, and the pooled estimate was also as high as 14.28.
