Abstract
This study was conducted to evaluate the effect of selection on heritability, phenotypic and genetic correlation estimates for productive performance in Giza M-2 line as local broiler male line at the 3th (G3), 4th (G4), and 5th (G5) generations of selection for increasing live body weight (LBW) at 6 week of age (LBW6). The performance of Giza M-2 and RBC lines; LBW6, LBW at sexual maturity (BWSM), egg number (EN), and egg weight (EW) were evaluated in all generations. The Random Bred Control (RBC) was used as a control group. Giza M-2 line had significantly higher BMSW, EN, and EW compared with RBC line for all generations. Also, Giza M-2 line had higher heritability values for LBW6, BWSM, EN, and EW compared with RBC line in all generation. Also, there are negative phenotypic and genetic correlation between EN with LBW6, BWSM, and EW in the last three generation for both lines. The genetic correlations, between all traits, in Giza M-2 line were higher than its values in RBC line. Also, the genetic correlations between LBW6 and EN and EW were higher than the genetic correlations between BWSM and EN and EW in Giza M-2 line. In conclusion, selection program carried out with Giza M-2 line had positive genetic improvement in its productivity which reflected on genetic parameters of economic traits. In Giza M-2 line, future generations, to achieve proper meat production, we will focus on genetic selection of traits relevant to modern broiler breeding.