Effects of Shade and Feeding Zilpaterol Hydrochloride to Finishing Steers
Bradley M. Boyd, Steven D. Shackelford, Kristin E. Hales, Tami M. Brown-Brandl, Meredith L. Bremer, Matthew L. Spangler, Tommy L. Wheeler, David A. King, and Galen E. Erickson
University of Nebraska
Zilpaterol hydrochloride, or Zilmax, is a beta-agonist approved to be fed to finishing cattle the last 21 days of the feeding period. There is a 3 day withdrawal for this feed additive, so careful management is necessary for responsible use of this technology. Recently, some animal welfare concerns were associated with the feeding of Zilmax, so researchers wanted to determine if feeding Zilmax to finishing cattle impacted response to heat stress, mobility, and body temperature, performance, or carcass characteristics when fed in the open or in shaded pens.