ESTRUTURA POPULACIONAL E ASSINATURAS DE SELEÇÃO AO LONGO DE GERAÇÕES NO COMPOSTO MONTANA TROPICAL®

Abstract

The Montana Tropical® Composite population was developed based on crossing of four different biological types or racial groups: 1) N = Zebu breeds (Bos taurus indicus), 2) A = adapted taurine breeds (Bos taurus taurus), 3) B = British breeds (Bos taurus taurus), and 4) C = races from continental Europe (Bos taurus taurus). Pedigree and genotypes (51,962 SNP) from 3,215 animals from the Montana Tropical® Composite were used to predict the composition of biological groups in the pedigree with genomic data and how this composition relates to each generation within the composite population; (2) characterize a distribution of runs of homozygosity (ROH) in relation to new information within the run; (3) estimate and compare the inbreeding coefficient (F) based on the markers (FROH) and pedigree (FPED); (4) identify genomic regions of the islands of the ROH, and (5) identify quantitative trait loci located in the genomic regions under selection. The population structure of the Montana Tropical Composite is lowly related to the racial composition based on the NABC system. The levels and endogamy within the levels, an evolution over the generations is being important to this same aspect when it comes to a breed that explores the crosses of different biological types. Selection signatures identified overlap with QTLs related to meat quality indicating that the production objective to produce a composite breed animal past the meat of outstanding meat for meat quality is being achieved.