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Distribution of Trenbolone Residues in Liver and Muscles of Heifers A paper in the May/June issue of the Journal of AOAC INTERNATIONAL describes a study of the distribution of trenbolone acetate, a steroid, in the carcasses of slaughtered cattle. Trenbolone is implanted at the base of the ear of cattle being shipped to slaughter as a way to increase appetite and muscle growth. The cattle in the study were implanted with 3–4 times the recommended dose . The slaughtered cattle showed considerable biological variability in the metabolism and distribution of the steroid in the liver and muscles. Cattle with three implants sometimes showed concentrations higher than those with four implants. Researchers suggest that this variability is the source of results outside of the expected range in earlier studies--not misimplantation--as previously thought. Because results are based on a single study of feedlot heifers, researchers recommend additional study The paper, written by Canadian Food Inspection Agency researchers James D. MacNeil, JoAnn Reid, and Rick Fedeniuk, is included in the May/June issue of the Journal of AOAC INTERNATIONAL. Click here for additional information on subscribing to the Journal or to purchase the article.
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