Abstract
This study was carried out at Poultry Experimental Farm of Faculty of Agriculture, Minufiya University, Shebin El-Kom, Egypt. Norfa strain was used, and data were collected from one pedigreed generation. 294 cocks and 882 hens were used to produce 1105 progeny. Each cock artificially inseminated three hens. Mating of relatives was avoided. Only birds with complete records were included in the index. Age at sexual maturity (SM), Body weight at 38 wk, Egg weight (EWM) and Egg number (EN42wk) were used to construct the original, 3 completely restricted and 6 partial restricted indices. Also, different three selection intensities were used for each selection index. The heritability values of SM, BWM, EWM and EN42wk were 0.31, 0.78, 0.30 and 0.80, respectively. The economic values of these traits were zero, 2.81, 7.17 and 2.75, respectively. Single completely restriction of SM or BWM caused decreasing in the accuracy of the index. The completely restriction of BWM caused higher decreasing in the Accuracy of the Index comparing with that caused by completely restriction of SM. Moreover, the mutual completely restriction of SM+BWM caused the highest decreasing in the accuracy of the index. Applying different Selection intensities for each selection index caused different genetic changes for all traits. The results indicate that decreasing selection intensity for any selection index caused decreasing in genetic change for each of studied traits.