Just days after beef processor Tyson announced the company would no longer accept animals fed the beta-agonist feed additive Zilmax, the product's manufacturer, Merck Animal Health, Tuesday released a plan to review and re-certify farms using the supplement to ensure its safety.
The product causes cattle to put on more muscle and less fat late in the feeding period.
"Worldwide regulatory agencies have reviewed extensive data on Zilmax and have concluded that use of Zilmax, according to the label, is safe in cattle," a Merck statement said.
Though Merck said that studies from University experts indicate that behavior and movement of cattle fed Zilmax is normal, riginal reports from Tyson indicated that the product was causing mobility issues, thus resulting in a call to end its use. The company listed a Sept. 6, 2013, date to end purchases of Zilmax-fed cattle.
In response to the deadline, Merck introduced a five-step approach to audit and recertify handlers and users of the product. Specifically, Merck said it will:
1. Re-certify every feeder/nutritionist/veterinarian that feeds Zilmax to cattle immediately. Special attention will be given to feed mixing and determining which cattle are good candidates for the use of beta-agonists;
2. Reach out to packers and suppliers to initiate a scientific audit, which will focus on the feeding of Zilmax, and will follow those cattle from the feedyard to the packing plant to determine potential causes of lameness and other mobility issues during feeding, transportation, offloading and staging at the processing facility. Merck will do a thorough review of potential compounding factors—such as nutrition, transportation, receiving facilities, etc., with the participation of third-party experts in the next 30 days;