Genealogy and its influence in the genetic value of Nelore Breeders.

Abstract

The Total Genetic Merit index of The Genetic Improvement Program of the Nellore Breed rejoins in unique information the different predictions for the genetic value of five features. The calculation considers the Expected Differences in the Progeny for the weight maternal effect at 120 days of age; the direct genetic effect for the weight at 120; 365 and 450 days of age; and the scrotal perimeters at 365 and 450 days of age. The study aimed to evaluate the influence of the information from the ascendants (parents and grandparents) when estimates the genetic value of the breeders. A file with 29,769 observations was analyzed, from which twelve bulls were selected, and three files were created based on these bulls: the first file contains the information about the bulls and their descendants; the second one tells the information about the parents and the last one the information about the grandparents. The estimative of the genetic parameters was done under the Animal Model with single characteristics. The first positions in the rating remained unchanged in the different files, the alterations (maximum of two places) happened as of the sixth position. We concluded that we could select a breeder based on his estimated genetic value from his own information and from his descendants, trusting on the genetic value.