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Arquivo Brasileiro de Medicina Veterinária e Zootecnia

Print version ISSN 0102-0935On-line version ISSN 1678-4162

Abstract

COSTA, M.D. et al. Genetic trends of linear traits of the Brasileira pony breed. Arq. Bras. Med. Vet. Zootec. [online]. 2001, vol.53, n.2, pp.1-11. ISSN 0102-0935.  http://dx.doi.org/10.1590/S0102-09352001000200020.

Data from 2073 Brasileira pony horses, born from 1974 to 1994, were used to predict breeding values and to study genetic trends of 10 linear traits. Derivative free restricted maximum likelihood methodology and MTDFREML algorithm were used for breeding value predictions. Genetic trend was accessed using weighted least squares estimates for regression coefficients of average breeding values on year of birth. Genetic trends were present (P<.01) in seven of the 10 traits. For each year there was a reduction of .070cm in withers and croup heights, .037cm in head length, .025cm in neck length, .023cm in croup length, .073cm in body length and .004cm in head width. Results indicated proportional body reduction of the Brasileira pony breed.

Keywords : Equine; miniature horse; body measurement; breeding value.

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