Resumen de Genetic divergence study among Duroc, Landrace and Large White swine breeds using techniques of multivariate analysis

A. Vieira Pires, R. da Fonseca, J. Araujo Cobuci, C. Vieira Araujo, A. Correa da Costa, Paulo Sávio Lopes, Robledo de Almeida Torres, Ricardo Frederico Euclydes

• Multivariate techniques were used to evaluate the genetic divergence among three swine breeds. Six performance traits were evaluated: piglet weight at birth (PON), at 21 days (P21), at 70 days (P70), average daily weight gain (GDP), age to obtain 100 kg (ID100) and backfat thickness (ETO). Breed performance was evaluated by multivariate analysis of variance and Fisher’s linear discriminant function, using tests of Roy’s greatest root and Roy’s union-intersection to multiple comparison. The study of genetic divergence was made by canonical variables analysis. The Large White breed was somewhat superior in relation to Landrace, and both were better than Duroc. Great genetic divergence was observed between Landrace and Large White breeds and Duroc breed, while the former two presented more similarity. These results justify utilization of the Landrace and Large White breeds to produce F1 females for crossing with Duroc males to obtain hybrid offspring expressing heterosis and in which there is complementation amog traits.