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The beef found in the Taoyuan store was part of batches totaling 361.25 kg imported by Mayfull from the United States in January, all of which was sold to Wowprime, according to Chiu Hsiu-yi, head of the Food and Drug Division under Taipei’s Department of Health.
Wowprime said the questionable beef was sold only at Yuanshao outlets.
The group also said that only 33 kg of the questionable beef had been sold since Sept. 2.
Taiwan only allows the leanness-enhancing drug ractopamine in U.S. beef with a cap of residue levels at 10 parts per billion (ppb).
Zilpaterol is more toxic than ractopamine and may not be easily metabolized by animals, according to the health department, but it has been approved by the United States Food and Drug Administration as a supplement for cattle.
|CAS number||117827-79-9 Y|
|Mol. mass||261.148 g/mol|
Zilpaterol (zilpaterol hydrochloride) is a beta-adrenergic agonist. Under its trade name, Zilmax, it is used to increase the size of cattle and the efficiency of feeding them. Zilmax is produced by Intervet, a subsidiary of Merck & Co., and marketed as a “beef improvement technology”. Zilpaterol is typically fed in the last three to six weeks of cattle’s lives, with a brief period (three days in the US) before death for withdrawal, which allows the drug to mostly leave the animal’s tissues.