Forty ducks aged 7 weeks of strains A44 and P66 and conservative flocks P33 and K2 were investigated, 5 males and 5 females from each. Carcass composition was determined and microstructure of pectoralis maior muscle analysed. Males and females of strain A44 and those from flock K2 were characterized by a significantly greater breast muscles per cent of carcass compared to strain P66 and flock P33, with a significantly lower per cent of thigh and of lower-thigh muscles in K2 males than in males P66 and P33. Carcasses of K2 females contained significantly less skin with subcutaneous fat (incl. neck skin) compared to A44,P66 and P33 females. Pectoralis maior muscle of males and females from both conservative floks was characterized by significantly greater per cent of red fibres and lower per cent of white fibres,as well as smaller diameter of both fibre types. Moreover, the mean white fibre diameter in K2 was significantly lower than in P33 birds.Satisfactory body weight found in birds of both sexes from conservative flock P33 , and considerable muscling, low fatness, greater per cent of red fibres and lower diameter of both fibre types in P33 and K2 birds indicate the feasibility of using them in production of valuable food and in breeding programmes aimed at improving the existing, and creating new, strain(s) of ducks.
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