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Effect of Environmental Factors from Birth to the Onset of Reproductive Function and Management in Indo-Brazilian Heifers

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Author(s): Juan P. Zárate-Martínez | Víctor D. Hernández-Hernández | Julio César Vinay-Vadillo | José Alfredo Villagómez-Cortés | Ángel Ríos-Utrera

Journal: International Journal of Animal and Veterinary Advances
ISSN 2041-2894

Volume: 5;
Issue: 2;
Start page: 61;
Date: 2013;
Original page

Keywords: Age at conception | age at first breeding | beef production | Gompertz equation | puberty | tropical regions | Zebu cattle

ABSTRACT
In order to evaluate factors that affect growth, age at first breeding (AFB) and age at conception (AC) 246 records of Indo-Brazilian heifers were used. An analysis of variance was performed with a model including the fixed effects of season of birth (SB), year of birth (YB), dam’s parity number (DPN) and breeding season (BS). Birth weight (BW), weaning weight (WW) and weight at first breeding (WFB) were included as covariates. The following interactions were also included, SBxYB, YBxDPN and BSxYB. The association of WFB with AFB and AC was analyzed by regression. The growth was described from birth to first calving with the Gompertz equation. AFB and AC were affected by SBxYB and BSxYB (p
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