Resumo

ROMERA, BM et al. Variancia intrapoblacional para caracteres de la madurez sexual en gallinas del cruzamiento Campero Casilda. FAVE, Secc. Cienc. vet. [online]. 2019, vol.18, n.1, pp.30-35. ISSN 2362-5589.

Principal components is a multivariate statistical technique of synthesis of information or reduction of the number of variables, with the potential to expose non-obvious relationships between characters, thus contributing to a more efficient interpretation of the information contained in a set of data. Its application to six traits associated to sexual maturity (age and body weight at first egg, weight of the first and the first ten eggs, number of days required to lay the first ten eggs and coefficient of variation of their weights) allowed to characterize the structure of intra-population variability in hens of the experimental three-way cross Campero Casilda. The first two components -PC1 and PC2- explained 56% of the total phenotypic variance. The joint consideration of both components allowed identifying a group of birds characterized for being older and heavier at sexual maturity, with a more regular onset of the productive phase, with uniform and heavier eggs, a conjunction of desirable characters for the beginning of the cycle. The importance of this identification lies in the recognized usefulness of principal components analysis as a strategy to generate biological selective indexes.

Palavras-chave : Backyard poultry; Egg weight; Laying regularity; Egg weight uniformity.

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