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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Growth and carcass composition of female turkeys implanted with anabolic agents and fed high-protein and low-protein diets.

This laboratory investigated the anabolic effect of the synthetic steroid trienbolone acetate (TA) and found it effective in male and female meat turkeys without any apparent gross abnormalities (Poultry Sci., 61: 1386, 1982). The present study was undertaken to characterize the response of female turkeys, fed equicaloric diets varying in dietary protein density to anabolic agents implanted at 13 wks. TA and zeranol ( Z) were tested singly and in combination ( TAZ). Body weight gain and feed conversion at 16 wks of age were improved (P less than 0.01) with TA and TAZ. The response to TA was enhanced as dietary protein density increased. Carcass fat, protein, ash, energy, potassium, and calcium were not altered by implant treatment. A trend existed toward increased carcass fat with zeranol implantation. Carcass moisture (P less than 0.01) and sodium (P less than 0.05) were increased in the TA treatment. Blood plasma electrolytes were not affected by implant treatments but plasma calcium was decreased (P less than 0.05) by TAZ. No synergism was noted between TA and Z with respect to growth, feed conversion, carcass composition, plasma electrolytes with the exception of plasma calcium. No interaction was observed between dietary protein density and implant treatment. Performance variables increased and carcass fat decreased with increasing dietary protein density. These results confirm our earlier finding with respect to TA and provide additional evidence that dietary protein density influences the response of meat turkeys to TA. The data show that zeranol lacks an anabolic effect in turkeys.[1]


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