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Examinations were conducted in two flocks of broiler parents’ hybrids Ross  308 and Cobb 500. At the beginning of the production cycle (24th weeks of  age) was determined that the average hens body weight of hybrid Ross 308 was  2680.40 g, and to hybrid Cobb 500 was 2697.80 g. At 42nd weeks of age (middle  of the production cycle) hens body weight was 3565.10 g (Ross 308) and  3599.05 g (Cobb 500), while at the end of the production cycle (61st weeks of  age) hens body weight of hybrid Ross 308 was 3841.50 g, and to the Cobb 500  was 3850.00 g. Determined differences of hens body weight (17.40 g, 33.95 g  and 8.50 g) in specific periods of the production cycle, and the difference  in hens body weight for the entire cycle (23.26 g) weren’t statistically  significant (P>0.05). Specific consideration of the impact of hens’ body  weight on reproductive performances of broiler parents was determined by  calculating the coefficients of phenotypic correlation among the tested  indicators. Thus, between hens body weight and most reproductive indicators  of broiler parents were determined statistically very significant (P<0.001)  coefficients of phenotypic correlation, while between hens body weight and  the percentages of chickens feasibility from fertilized eggs were determined  significant (P<0.001; P<0.01; P<0.05) correlation coefficients for a slightly  shorter period than anticipated production cycle. [Projekat Ministarstva  nauke Republike Srbije, br. TR-31033]

Phenotypic correlation of hens body weight and reproductive traits of broiler parents