Not Yet Classified — Worldwide/Unknown
The largest population of cattle reviewed by the researchers was a grouping of 722 704 animals in 2011-12 from 9 different US feedlots. Of 637 339 that were fed Zilmax, 0.53 percent died prior to slaughter, according to the report. That is well above a 0.3 percent death rate among the 85 365 cattle that were fed neither Zilmax nor a rival beta-agonist, Optaflexx.
A separate study of 149 636 cattle from one feedlot in those same years showed that 83 865 animals fed Zilmax had a 0.48 percent
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