Abstract
Body weight collected in 335 cows belonging to four genetic groups, representing different biological types: Nelore, 1/2 Canchim:1/2Nelore , 1/2 Angus:1/2Nelore 1/2Simental:1/2Nelore , born in the years 1988 to 2200 , in two birth season, spring and autumn. These cows remained in the herd until now, were produced in the research project of the EMBRAPA Center at São Carlos, SP. " Bre…