Divergência genética de aves de postura utilizando análises uni e multivariada

Genetic divergence of laying hens using uni and multivariate analyses Genetic divergence among five lines of laying hens was evaluated by univariate (ANOVA) and multivariate analysis of variance (MANOVA), using the likelihood ratio criterion (Wilks test) and Roy test; multiple comparisons Hotelling’s T 2 test, Roy and Bose’s test and the Bonferroni’s simultaneous confidence interval. The study included the following traits: body weight at 40, 48, and 56 weeks of age; egg weight at 40, 44, 52, and 60 weeks of age; and laying ratio from 40 to 60 weeks of age. The ANOVA analysis showed differences among lines for some traits. However, MANOVA showed no genetic divergence among the lines of laying hens based on the Wilks and Roy test. Lack of genetic divergence among laying hens was confirmed by multiple comparison tests, which are more rigorous for the rejection of the null hypothesis because it considers a multiple significance level, whereas in the univariate analysis the significance level is single.