Caracterização demográfica e estrutura genética populacional de equinos da raça Campolina

Abstract

The aim of this study was to evaluate the demographic structure and genetics population of Campolina horse breed. Were obtained information from genealogical records from the database provided by Associação Brasileira dos Criadores do Cavalo Campolina on the 107,630 animals recorded between the years of 1951 and 2016, to males, females and gelded ones from sutdbooks definitive and closed and open. Parameters of population to generations interval, average age of parents at the birth of their offspring, maximum number of generations and genetic importance of studs and genetic evaluations in order to estimate the actual number of founders and ancestors, effective population size and inbreeding coefficient and average relatedness coefficient. Demographic parameters analyzes were obtained through the software ENDOG V4.9. For the population evaluated, it was observed that 26,672 dams and 4,321 sires used for breeding have left descendants, with an average of 4.01 offspring/dam and 25.44 offspring/sire. It has been estimated to actual number of founders and ancestors contributing to the formation of the Campolina horse breed equivalent to 60 and 54 individuals. Generations intervals was estimated to 8.96 years. The inbreeding coefficient calculated for the population Campolina was equal to 2.44% and average coefficient of relatedness was 2.15%. Attention should be given to the process of selection and choice of animals that will be mated to prevent economic losses and functional as a result of inbreeding depression.