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Avaliou-se o efeito da idade de desmame no desempenho e nas características de carcaça de bezerros filhos de vacas cruzas zebuínas x taurinas, primíparas aos 3 anos de idade. As vacas foram mantidas durante dois invernos/primaveras, do desmame à primeira estação de monta, em pastejo rotativo em dois grupos (ponta e rapador), em pastagens de azevém anual (Lolium multiflorum Lam) e trevo vesiculoso (Trifolium vesiculosum cv. Yuchi) e, posteriormente, durante o verão e o outono, em campo nativo. Os bezerros foram distribuídos aleatoriamente, segundo o grupo racial e o grupo de pastejo das vacas, em duas idades de desmame: desmame precoce (DP) = sete bezerros desmamados aos 70 dias de idade com 83,2 kg de PV médio; e idade convencional (DC) = dez bezerros desmamados com 180 dias de idade e 152,0 kg de PV médio. O delineamento experimental foi o completamente casualizado. Os novilhos foram abatidos aos 2 anos de idade. O grupo de manejo das vacas (ponta ou rapador) não teve efeito sobre o desempenho e as características de carcaça dos novilhos. Os animais do desmame convencional foram mais pesados até 1 ano de idade (DP = 183,0 kg vs DC = 202,1 kg), mas não diferiram dos demais quando abatidos aos 2 anos de idade (DP = 411,2 kg vs DC = 408,5 kg). As carcaças não diferiram quanto ao acabamento, à conformação, à classificação "Cota Hilton" e ao rendimento. Portanto, o desmame precoce não influenciou o desenvolvimento e as características de carcaça ao abate aos 2 anos de idade. The objective of this trial was to evaluate the effect of weaning age on growth and carcass characteristics of calves from primiparous Bos indicus x Bos taurus crossbred cows. Heifers were divided in two groups according to the order of access to pasture and rotationally grazed pastures of ryegrass (Lolium multiflorum Lam) and arrowleaf clover (Trifolium vesiculosum cv. Yuchi) from weaning until their first mating season (two winter/spring seasons); animals were then transferred to native pasture in the following summer-autumn season. Calves were randomly assigned, according to breed and heifers grazing group order, to one of two weaning ages: early weaning (EW) - 07 calves weaned at 70 days of age with an average body weight of 83.2 kg or conventional weaning (CW) -10 calves weaned at 180 days of age and with an average body weight of 152.0 kg in a completely randomized design. Steers were slaughtered with two years of age. Heifers grazing group did not affect calves performance. Calves in the CW treatment were heavier (202.1 kg) at one year old than those on EW (183.0 kg), but no significant difference was observed when animals were slaughtered at two years of age (CW=408.5 kg vs. EW=411.2 kg). Carcass traits such as fat thickness, conformation, "Hilton Quote" classification, and hot yield did not differ comparing EW with CW steers. Therefore, early weaning did not affect performance and carcass characteristics of steers slaughtered at two years of age

Efeito da idade de desmame no desenvolvimento e nas características de carcaça de novilhos de corte