Two groups of turkeys: slow-growing primitive turkeys (SS n = 80 and n = 80) and fast-growing Big-6 turkeys (<$<$ n = 80 and n = 80) were reared in a semi-intensive system: turkey hens until 14th week whereas turkey toms until 22nd week of life. Twelve males and twelve females with body weight corresponding to the mean body weight in a group were selected from each group for slaughter and slaughter performance analysis. A significantly (P < 0.01) higher body weight and weight of all anatomical parts examined were found in both hens and males of Big-6 turkeys. An exception was the weight of abdominal fat (P < 0.05) and weight of gizzard (NS) in males. In turn, Big--6 females were characterized by a significantly (P < 0.01) higher percentage of: breast muscles (by 8.7), leg muscles (by 2.4) and abdominal fat (by 0.9), and significantly (P < 0.01) lower percentage of: wings, heart, liver and gizzard (by respectively: 0.2, 0.1, 0.3 and 1.9) in the body weight. In the case of Big-6 males, analyses demonstrated a significantly (P < 0.01) higher percentage of breast muscles (by 16.5) and leg muscles (by 2.5, P < 0.05), and lower (P < 0.01) percentage of wing, heart, liver and gizzard (by respectively: 0.3, 0.2, 0.7 and 1.5) in the body weight, compared to the primitive turkeys.
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