Estudo da capacidade de combinação de linhagens de matrizes de frango de corte, por meio da análise de fatores de características produtivas

Abstract

A análise de fatores é uma técnica de análise multivariada que trata das relações internas de um conjunto de variáveis, substituindo um conjunto inicial de variáveis correlacionadas por um conjunto menor de fatores (ou variáveis hipotéticas) que podem ser não-correlacionados (fatores ortogonais) ou correlacionados (fatores oblíquos), que explicam a maior parte da variância do conjunto original (FACHEL, 1976 Combining Ability of Parental Broiler Lines using Factor Analysis of Productions TraitsABSTRACT -This study was carried out to study the combining ability of parental broiler lines using factor analysis of production traits. The single crosses (partial diallel) among the male lines of group 1 (LL, TL, ZL, TT, LT, ZT, ZZ, LZ, and TL) and female lines of group 2 (PP, KP, VP, KK, PK, VK, VV, PV, and KV). A completely randomized blocks design, with three blocks, 81 single crosses and nine females per cross was used. The production traits, were fertility at 32 nd , 38 th ‚ 42 nd and 49 th weeks of age‚ hatchability at 32 nd , the initial body weights of the chicks‚ body weight and feed:gain ratio at 42 nd days of age, and carcass yield‚ breast yield and fat pad yield at 42 nd day of age of the broiler. Four factors, whose biological meanings were defined after rotation of the factor, were used. The lines that stood out in the factor analysis, for factor 2 (body weigh t factor at 42 nd day) were LT and LZ, in group 1, and VP, KP, KK, KV, PK and VV, in group 2.