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Zeranol is a natural mycoestrogen derived from zearalenone, a mycotoxin produced by various Fusarium mold species. This non-steroidal anabolic agent is widely used in cattle production to enhance growth performance, body weight gain, and feed conversion efficiency. Zeranol implants are administered subcutaneously at the base of the ear, either alone or in combination with trenbolone acetate, to promote lean tissue development and improve overall productivity in beef cattle.

Due to concerns surrounding hormonal growth promoters, residue monitoring, and potential endocrine-disrupting effects in humans, the use of zeranol in food-producing animals is strictly regulated in many countries. As a result, testing for zeranol residues in meat and animal tissues is essential to ensure food safety, regulatory compliance, and consumer protection.