Correct use of anabolic agents in ruminants

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Abstract
When used in the correct combination for the class of stock, implanted anabolic agents [trenbolone acetate, hexestrol, zeranol and estradiol] produce a considerable improvement in liveweight gain and feed conversion efficiency. Observation of the recommended withdrawal period and correct site of implantation [base of the ear] is essential to avoid unacceptable residue levels in meat. Implantation of anabolic agents into breeding stock causes permanent changes in reproductive organs and is always contraindicated.