Abstract

BRUMATTI, R.C.; FERRAZ, J.B.S.; ELER, J.P.  and  FORMIGONNI, I.B.. Development of selection index in beef cattle under the focus of a bio-economic model. Arch. zootec. [online]. 2011, vol.60, n.230, pp.205-213. ISSN 1885-4494.  https://dx.doi.org/10.4321/S0004-05922011000200005.

Aiming to increase the economical studies applied to animal genetic improvement, the present work had as goal to develop a bio-economical model to determine the economical weights utilized on indexes of selection in genetic improvement programs in beef cattle. A standard scenario was developed where, in absolute terms, the traits with major economical relevance were respectively, carcass yield, traits related to herd fertility, followed by those related to weight and weight gain, and last, referred to mortality. The genetic-economical values obtained were 0.897 for stayability, 0.201 for heifer pregnancy at 14 months (PP14), 0.190 for pos-weaning weight/kg/day, 0.061 for weaning weight and 0.080 for steer weight at 18 mo. Therefore, it was verified that the reproductive traits, stayability and PP14, were 4.28 and 13.46 times economically more important than the growth traits, pos-weaning weight, weaning weight and steer weight at 18 months.

Keywords : Breeding goals; Selection objective; Economic values.

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