Hales, T. L. Covey, M. F. Miller, W. T. Nichols and M. L. Galyean J. T. Vasconcelos, R. J. Rathmann, R. R. Reuter, J. Leibovich, J. P. McMeniman, K. E. on feedlot cattle performance and carcass traits Effects of duration of zilpaterol hydrochloride feeding and days on the finishing diet published online May 9, 2008 J ANIM SCI http://jas.fass.org/content/early/2008/05/09/jas.2008-1032.citation the World Wide Web at: The online version of this article, along with updated information and services, is located on www.asas.org by guest on May 21, 2011 jas.fass.org Downloaded from