Resumo

RUALES-ESPANA, Fredy R  e  MANRIQUE PERDOMO, Carlos. Use of Principal Component Analysis for building up a production-type index for Romosinuano (Bos taurus) cattle. Rev Colom Cienc Pecua [online]. 2007, vol.20, n.2, pp.124-128. ISSN 0120-0690.

In this work the Principal Components Analysis (PCA) and its application in constructing a Selection Index (SI) for Romosinuano cattle is shown. The database of the Colombian Romosinuano Breeders Association was used, corresponding to 5825 records of body weight at 30 months and 31 bovinometrics traits of a progeny of 184 sires, born between 1981 and 1993 in 17 herds. The data base was edited for including only animals that fit all variables needed to get correlations, which resulted in a data base of 1562 records from progenies belonging to 121 sires. A PCA was applied to body weight and bovinometrics traits with the aim to select those that gave the maximum principal component variation and that were associated with genetic parameters, which results in 8 bovinometric traits associated to body weight. A SI was constructed with these traits, resulting in a greater genetic progress than that obtained for selection according to body weight alone, justifying the use of PCA to generate a SI based on morphometric traits associated to body weight.

Palavras-chave : bovines; genetic; progress; selection.

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