Effect of strain and sex on productive performance and carcass traits in some broiler chickens

This study was aimed to investigate the effect of strain and sex on productive performance and carcass traits of commercial hybrids Ross 308 and Cobb at 35 days age. A total number of three hundred 1-day old chicks (150 chicks per each hybrid) were purchased and reared under similar environmental, hygienic and managerial conditions until slaughter. All chicks were weighed individually at 35 days of age. The growth performance traits included; body weight, body weight gain, feed consumption and feed conversion ratio, and the carcass characteristics of both hybrids were measured. The results indicated that the Ross hybrid had the highest body weight and body weight gain at 35 days of age compared to Cobb. Sex significantly influenced body weight gain (P<0.05) with higher means in males than females. There were significant genotype × sex interaction effects on body weight gain. The genotype of the hybrid (Ross 308 and Cobb 500) and sex had significant effect on the body weight at 35 days the old The hybrid Ross 308 was superior on Cobb 500 in dressing percentage and weight carcass. The male is the superior of the in the body weight, carcass weight and dressing percentage ratio than female. The results also showed live weight of Ross and Cobb (1983.75 and 1878.13 g), carcass weight (1470 and 1410.13 g) and dressing percentage (74.69% and 74.89%) respectively.