Distribution of Trenbolone Residues in Liver and Various Muscle Groups of Heifers that Received Multiple Implants at the Recommended Site of Application

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Twenty heifers which were each administered 3 or 4 implants containing trenbolone acetate were slaughtered at 30 days post-implantation. Liquid chromatographic analyses were conducted on muscle collected from the rump, loin, shoulder, and neck, and on the liver of each animal. Residues present in liver were primarily 17-trenbolone, and the residues found in the various muscle samples were primarily 17-trenbolone. The mean concentration of 17-trenbolone in liver was 4.3 2.3 ng/g; the mean concentration of 17-trenbolone in muscle tissues was <0.4 ng/g. There was a small but statistically significant effect of the number of implants used on the mean concentration of residues in loin muscles; animals with 3 trenbolone implants had higher mean residue concentrations than animals with 4 trenbolone implants. This suggests that, though the impact of implant numbers on the mean concentration of residues in muscle tissues is negligible relative to currently generally accepted maximum residue levels, mechanisms may exist for selective distribution and retention of residues within different muscle groups.

Document Type: Research Article

Affiliations: Canadian Food Inspection Agency, Center for Veterinary Drug Residues, Saskatoon Laboratory, 116 Veterinary Rd, Saskatoon, SK, Canada S7N 2R3.

Publication date: May 1, 2008

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  • The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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