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Ciência e Agrotecnologia

versão impressa ISSN 1413-7054

Resumo

SILVA, Natascha Almeida Marques da; AQUINO, Luiz Henrique de; SILVA, Fabyano Fonseca e  e  OLIVEIRA, Antonio Ilson Gomes de. Growth curves and non-genetic factors affecting growth rate of Nelore cattle. Ciênc. agrotec. [online]. 2004, vol.28, n.3, pp.647-654. ISSN 1413-7054.  https://doi.org/10.1590/S1413-70542004000300022.

Non-genetic effects were evaluated on growth rate of Nelore cattle from birth to 205 days (TX1), 205 to 365 days (TX2), and 365 to 550 days (TX3) of age. The data came from nine bimonthly weight-age records, from birth to two years of age, of 1.138 animals, 508 males and 630 females, collected between 1978 and 1993. Brody, Gompertz, Richards, Bertalanffy and Logistic nonlinear models were fitted for each animal, generating weight estimates at different ages. Gompertz model showed the best fitting and was chosen for growth rates computations. Effects (P<0,01) of sex on TX2 and TX3, year of birth on all growth rates, and season of birth on TX2 and TX3 (P<0,01), were observed. The optimization of management techniques in specialized herds is possible with the informations of the non-genetic factors that influence growth rates at distinct ages.

Palavras-chave : Growth curve; growth rate; Nelore cattle; non-genetic factors.

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