Fertilidade real e intervalo de partos de vacas Nelore po sob manejo extensivo e sem estação de monta na região centro oeste do Brasil
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Data
2008-03
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Resumo
This study was designed to evaluate the variation sources that interfere in the true fertility index
and the effect of herd environment in the calving interval of Nelore P.O. cows raised in extensive production systems in
Middle-West of Brazil, without breeding season. The analyzed data were parity order (OP), calving age (IP), calf birth
weight (PN), weaning weight (PD), calving year and month (AP, MP) and calf sex (SB) of 546 cows, calculating the
calving interval (IDP) and fixing the aleatory effect of mother (EAM). IDP and PD were used to calculate the index of
true fertility (FR). IDP (452,68±117,10 days) was influenced (P <0,05) by OP, IP, PN and EAM. FR average
(148,6±34,5kg) was influenced (P <0,05) by AP, MP, OP, S and IM.
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Palavras-chave
Ambiência, Eficiência reprodutiva, Parto, Peso à desmama, Calving, Environment, Reproductive efficiency, Weaning weight
Citação
VIU, Marco Antônio de Oliveira; BRASIL, Ipojucan de Goiás; LOPES, Dyomar Toledo; GAMBARINI, Maria Lúcia; FERRAZ, Henrique Trevizoli; OLIVEIRA FILHO, Benedito Dias de; MAGNABOSCO, Cláudio de Ulhôa; VIU, Alessandra Feijó Marcondes. Fertilidade real e intervalo de partos de vacas Nelore po sob manejo extensivo e sem estação de monta na região centro oeste do Brasil. Bioscience Journal, Umuarama, v. 24, n. 1, p. 104-111, jan./mar. 2008.