Vald?z-Garc?a, Yissel S., J. I. Aguilera-Soto, A. Barreras, A. Estrada-Angulo, A. G?mez-Vazquez, A. Plascencia, Julio J. Reyes, Justiniano Stuart, and Noem? G. Torrentera. 2011. “Growth Performance and Carcass Characteristics in Finishing Feedlot Heifers Fed Different Levels of Chromium-Enriched Live Yeast or Fed Zilpaterol Hydrochloride”. Cuban Journal of Agricultural Science 45 (4). https://www.cjascience.com/index.php/CJAS/article/view/94.