L. Calegare, M. M. Alencar, I. U. Packer, C. L. Ferrell and D. P. D. Lanna Cow/calf preweaning efficiency of Nellore and Bos taurus × Bos indicus crosses doi: 10.2527/jas.2007-0759 originally published online October 24, 2008 2009, 87:740-747. J ANIM SCI http://jas.fass.org/content/87/2/740 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 July 27, 2011 jas.fass.org Downloaded from