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Effects of castration and testosterone implants on carcass yield, carcass conformation, body composition, and chemical composition of edible meats in male turkeys were determined. A2•~2 factorial arrangement of treatments with testosterone implant and castration was incorporated in experimental design. Male turkeys were castrated at 9.5 weeks of age and implanted with testosterone pellets at 20mg/kg body weight at 11 weeks of age. Six turkeys from each treatment were killed at 21 weeks of age to determine the carcass quality and the chemical composition. The yield of eviscerated carcasses was increased (P•...0.05) by testosterone treatment (T), but not affected by castration (C). Abdominal fat was reduced (P•...0.05) by T, but not affected by C. The amount of skin was incresed (P•...0.05) by T and decreased (P•...0.05) by C. The wing yield was reduced (P•...0.05) by T and increased (P•...0.05) by C. The part and lean yields were not affected by either T or C with the following exceptions. The lean yield of breast was increased (P•...0.05) by T and the part and lean yields of drumsticks were reduced (P•...0.05) by C. Body composition was affected (P•...0.05) by T, but not by C. The moisture content was increased (P•...0.05) by T. The chemical composition of breast, thigh, and drumstick was not affected by either T or C with an exception that the moisture content of breast meat was increased (P•...0.05) by T. (Jpn. Poult. Sci., 33: 153-161, 1996)

Testosterone on Turkey Growth: 2. Effects of Castration and Testosterone Implant on Carcass Yield, Carcass Conformation and Chemical Composition.