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This experiment was conducted to evaluate the effect of strain and sex on productive performance, slaughter traits of chickens and the effect of strain on some productive as well as some reproductive traits of local improved dual purpose. A total of 1951 one day old chicks of three Canadian strains (Shaver A,B and C) and two Egyptian chicken strain (El-Salam and Mandarah). Productive performance measured from one day to 65 weeks of age and slaughter traits were recorded for cocks at 12 weeks of age. Results revealed that strain effect was clear for Shaver C strain for body weight, weight gain, feed consumption. In addition Shaver C had better feed conversion, dressing, fleshing, liver, glycogen, tenderness percentages but recorded the highest percentages for abdominal and total fat content as well as lowest testicular weight of cocks . Shaver B showed higher percentages for blood loss, feather, bones and spleen percentages, but Shaver A showed the highest percentages for PH content, ashes and water holding capacity. Sex effect showed superiority of males over females for body weight allover study periods, weight gain and feed consumption, while viability in growing period were recorded for Egyptian chickens. Strain effect was evident for shaver C strain for body weight, feed consumption and egg weight ( at sexual maturity, at first 90 days of egg production, 42 and 65 weeks of age). While strain effect for fertility, hatchability and scientific hatchability, age at sexual maturity, Egg number at first 90 days of egg production, egg number at 42 and 65 weeks of age, egg quality were recorded for Egyptian chickens. Moreover, negative correlation estimates were observed between age at sexual maturity and egg number at different periods as well as positive correlation between body weight at all period ages, and most of productive traits that of high great benefits to select for economic traits in chickens at earlier age.  From the above results we can conclude that Canadian Shaver C strain recorded the best results for most productive traits, while Egyptian strains (EL-Salam and Mandarah) recorded the best results for reproductive traits as well as egg numbers at first 90 days of egg production, 42, and 65 weeks of age. egg mass at first 90 days of egg production, fertility and hatchability percentages , viability, egg quality. And local developed Egyptian environs mental conditions from other foreign breeds.

STRAIN AND SEX EFFECTS ON PRODUCTIVE AND SLAUGHTER PERFORMANCE OF DEVELOPED LOCAL EGYPTIAN AND CANADIAN CHICKEN’S STRAINS.