Data on 559 White Leghorn pullets progenies of 58 sires and 149 dams produced in single hatch, were used for construction of selection indices in various combinations of age at sexual maturity (X1), egg production (X2), egg weight (X3), 12 week body weight (X4) and 36 week body weight (X5). The heritability estimates of above five traits computed from sire component of variance were 0.16±0.14, 0.29±0.15, 0.08±0.15, 0.34±0.17 and 0.34±0.18, respectively. A total of twenty six selection indices were developed. On the basis of rIH (0.74) and UH (180.49 units) values, the index I1, involving all the five traits was found to be most efficient. The reduction in UH values due to exclusion of different traits revealed that 36-week body weight (X5) was most important trait followed by 12-week body weight (X4), egg production (X2), age at sexual maturity (X1) and egg weight (X3) for use of selection index for genetic improvement in White Leghorns.
Genetic improvement, index selection, layer chicken
