Efeito da época do parto, idade materna e sexo sobre o desempenho pré-desmama de bezerros Nelore (Bos taurus indicus), criados extensivamente no centro-oeste do Brasil
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Data
2006
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Resumo
Birth weight (PN), weaning weight (PD) and daily weight gain (GMD) of 2.973 Nelore calves born
from 1992 until 2003 in an extensive cattle production
system in Southwest of Goiás – Brazil, characterized
by tropical climate and rainy and dry well defined
seasons, aiming to verify the influence of environment,
represented by time of birth, cow age and sex on the
pre weaning performance in commercial production
systems without defined breeding season. Variance
analysis was used, through the GLM procedure applying
the Random option and using maternal effect as an
aleatory parameter. The mathematical model contained
birth year, calving season, calf sex, calf age nested in
sex, cow age (in classes), besides the lineal and
quadratic effect of calving age as co-variable. BW, WW
and DWG averages were, respectively, 29, 49±3, 45;
183, 62±21, 62; and 0,568±0,088 kg. In conclusion, for
the studied region environment effects, as time of
parturition, maternal age and sex influence directly the
pre weaning performance of Nelore calves.
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Efeito ambiental, Efeito materno, Gado de corte, Ponderal, Beef cattle, Environmental effect, Maternal effects
Citação
VIU, M. A. O.; LOPES, D. T.; GAMBARINI, M. L.; OLIVEIRA FILHO, B. D.; FERRAZ, H. T.; MAGNABOSCO, C. U. Efeito da época do parto, idade materna e sexo sobre o desempenho pré-desmama de bezerros Nelore (Bos taurus indicus), criados extensivamente no centro-oeste do Brasil. Archives of Veterinary Science, Curitiba, v. 11, n. 3, p. 75-79, 2006.