Avaliação de efeitos de ambiente e da repetibilidade de características reprodutivas em bovinos da raça Nelore
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Data
1994
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Resumo
Four hundred and seven observations on age at first calving (AFC), 871 on calving interval (CI) and 587 on cow weight at calving (CW) in Nelore cattle, were analyzed by the least squares method to evaluate the effects of some environmental factors on reproductive traits. Year and season of birth affected (P<0.01) AFC. Heifers born from February to April were older at first calving than the ones born during the rest of the year. Year and month of the first calving of the interval and order of the interval showed significant (P<0.01) effects on CI. Toe cows calving from June to December showed smaller intervals than those calving from February to May and the higher the order of the interval, the smaller the calving interval. Year, month and calving number affected (P<0.01) CW. Toe weights increased from the beginning to the end of the year and as the calving number got higher. Sex of calf had no effect on CI and CW. Toe estimated least squares means were 1213 days (39.9 months), 410 days (13.5 months) and 405 kg for AFC, CI and CW, respectively. The estimated repeat abilities of CI and CW were 0.24 ± 0.04an 0.61 ± 0.04, respectively.
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Gado de corte, Fertilidade, Nelore, Repetibilidade, Beef cattle, Fertility, Repeatability
Citação
PÁDUA, João Teodoro; MUNARI, Danisio Prado; WATANABE, Yeda Fumie; LEAL, Cláudia Lima Verde; OLIVEIRA, José de Anchieta Leite; ALENCAR, Maurício Mello de. Avaliação de efeitos de ambiente e da repetibilidade de características reprodutivas em bovinos da raça Nelore. Revista Brasileira de Zootecnia, Viçosa, v. 23, n. 1, p. 126-132, 1994.