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Avaliou-se o desenvolvimento de bezerros de corte submetidos a duas idades de desmame: precoce, em média com 80 dias de idade; convencional, em média com 152 dias de idade. Foram utilizados 105 bezerros Braford, nascidos nos anos de 2004 e 2005. Após o desmame, os bezerros foram mantidos em pastagens cultivadas de milheto (Pennisetum americanum) no primeiro e segundo verão e, no inverno/primavera, de aveia e azevém (Avena strigosa Schreb + Lolium multiflorum Lam). Foram avaliados os pesos corporais, ganhos de pesos médios diários e condição corporal. Houve interação significativa entre idade de desmame e ano para o ganho médio diário, tanto no desmame precoce como no desmame convencional, na pastagem de aveia e na de azevém. No período entre as duas idades de desmame, o ganho médio diário no desmame precoce foi maior em 2004 que em 2005 (0,499 vs 0,468 kg, respectivamente) e no desmame precoce ocorreu maior ganho médio diário em 2005 (0,493 vs 0,631 kg, respectivamente). Na pastagem de aveia e azevém, o ganho médio diário dos animais do desmame precoce em 2004 (0,666 kg) foi menor que em 2005 (0,760 kg), no entanto, não houve diferença entre os anos no caso dos animais do desmame convencional (0,720 e 0,723 kg, respectivamente). Durante os segundos verões, não houve diferença no ganho médio diário dos animais entre os desmames precoce e convencional. O peso dos animais do desmame precoce (158,2 kg) foi superior ao daqueles do desmame convencional (147,7 kg) no início da pastagem de inverno, porém, não diferiu no final. Ao final do verão, quando os novilhos atingiram 15-16 meses de idade, o peso corporal foi similar entre os desmames precoce (340,1 kg e 4,14 pontos) e convencional (332,8 kg e 4,15 pontos). A condição corporal final em 2004 foi maior (4,34) que em 2005 (3,96 pontos). Bezerros desmamados aos 80 dias de idade e alimentados adequadamente têm desempenho semelhante aos desmamados aos 152 dias de idade, atingindo desenvolvimento e acabamento adequados de abate para mercados específicos aos 15-16 meses de idade. The performance of beef calves submitted to two weaning ages (early weaning, at an average age of 80 days; conventional weaning, at an average age of 152 days) was evaluated. One hundred and five Braford calves born in 2004 and 2005, after weaning, were kept on pastures cultivated with pearl millet (Pennisetum americanum) in the first and second summer and, in winter/spring, they were kept on pastures with oat and ryegrass (Avena strigosa Schreb + Lolium multiflorum Lam). Body weight (BW), average daily weight gain (ADWG) and body condition (BC) were evaluated. There was a significant interaction among age at weaning and year for daily weight gain for early weaning as well as for conventional weaning on oat and ryegrass pastures. In the period between the two weaning ages, the daily weight gain in early weaning was higher in 2004 than in 2005 (0.499 vs 0.468 kg, respectively) and for early weaning, higher daily weight gain occurred in 2005 (0.493 vs. 0.631 kg, respectively). On oat and ryegrass pasture, average daily weight gain for early weaned animals in 2004 (0.666 kg) was lower than in 2005 (0.760 kg), however, there was no difference among years for conventional weaned animals (0.720 and 0.723 kg, respectively). During second summer periods, average daily weight gain did not differ among early and conventional weaned animals. Weight of early weaned animals (158.2 kg) was higher than conventional weaned animals (147.7 kg) in the beginning of winter grazing; however, it did not differ at the end. In the end of the summer, when calves were 15-16 months of age, body weight was similar among early weaned (340.1 and 4.14 points) and conventional (332.8 kg and 4.15 points) weaned animals. Final body condition, in 2004, was higher (4.34) than in 2005 (3.96 points). Calves weaned at 80 days of age and adequately fed present similar development as those weaned at 152 days of age, achieving development and finishing conditions to be slaughtered for specific markets at 15-16 months of age

Desenvolvimento de bezerros de corte desmamados aos 80 ou 152 dias até os 15-16 meses de idade