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The results of this study constitute a part of a project aiming at developing across-breedsuitable for an extensive rearing system, utilising local biodiversity.Hybrids from mating a commercial broiler's male component (C) withGreen-legged Partridgenous (GP) or Sussex (Sx) hens were compared with Cobbbroilers. The study included 720 chickens of 3 genetic groups. Up to thethird week of age, all birds were fed with balanced mixtures recommended forbroiler chickens. From the fourth week, the mixture was weekly reduced by 10 %for the birds kept extensively (E). The deducted part was replaced withwheat bran, and from the seventh week with wheat. E groups had access to runs andreceived green fodder. Birds were slaughtered in 12th week of life. Carcassyield, giblets and proportion of carcass elements were estimated along withmeat traits. The body weight at the 6th, 9th, 12th week of rearing anddissection results indicated a good suitability of Cobb chickens for anextensive rearing system. Hybrids were characterised by a considerably smallerproportion of breast muscle and slightly bigger of thighs and drumsticks,compared with Cobb, which could result from their greater motor activity.Results obtained by C × Sx and C × GP chickens, such as finalbody weight, proportions of abdominal fat and carcass elements, andappropriate value of meat traits, point at the usefulness of these hybrids as ameat-type chicken under extensive housing conditions. Darker colour ofchicken meat, derived from C cocks and Sx or GP hens crossbred, canconstitute an indicator for their carcasses' identification on the market

Growth performance, carcass traits and physical properties of chicken meat as affected by genotype and production system