Abstract
The aim of this research is to evaluate the effect of the use of hydrochloride of zilpaterol and ractopamine on carcass characteristics and meat quality of beef cattle. Forty-eight Nellore non-castrated males of Nellore will be breed for 90 days with a diet containing 85% of concentrate and 15% of roughage. After this period will be divided in three groups (n=16) and are feed with three d…