Estrutura populacional e influência da endogamia em características produtivas e reprodutivas de búfalos Murrah

Abstract

The objective of this study was to evaluate the population structure through pedigree information and include inbreeding in the prediction model to estimate its effect on the evaluation of genetic parameters and their influence on productive and reproductive characteristics of Murrah buffaloes. The average inbreeding (F) and average relatedness coefficient (AR) were 3.22% and 5.99%, respectively. The average generation interval was 6.39 years, while the effective population size over the entire generation was 88.9 in the first and 127.5 in the last generation. The effective number of founders and ancestors was 28 and 22. The heritability estimates for P305, PP, PG, PM and IPP were 0.24, 0.26, 0.18, 0.25, and 0.24, respectively. Suggesting the possibility of genetic gain for these characteristics. For the IEP and SCS, the heritability estimates were 0.04 and 0.09, respectively, thus indicating a greater influence of environmental effects on these characteristics. A correlation was observed between milk production (P305) and production of mozzarella (MP), protein (PP) and fat (GP). The regression analysis for P305 suggests that inbreeding exerts a negative and significant influence on this trait. In this context, inbreeding should be taken into consideration during mating and breeding selection to minimize and avoid negative effects on productive characteristics to maintain genetic variability to maximize the genetic progress in Murrah buffaloes.