Genome Association Study for Visual Scores in Nellore Cattle Measured at Weaning

BMC Genomics

卷:20

Fernando Baldi¹  Luis Orlando Duitama Carreño¹  Rafael Espigolan¹  Luciana Takada¹  Ligia Cavani¹  Tiago Bresolin¹  Lucia Galvão de Albuquerque¹  Roberto Carvalheiro¹  Matilde da Conceição Pessoa¹  Ricardo da Fonseca² 

[1] Animal Science Department, School of Agricultural and Veterinary Sciences, São Paulo State University (Unesp);

[2] Animal Science Department, São Paulo State University (Unesp);

关键词: BayesC;    Bayesian LASSO;    Growth genes;   

DOI  :  10.1186/s12864-019-5520-9

来源: DOAJ

【 摘 要 】

Abstract Background Genome-wide association studies (GWAS) are utilized in cattle to identify regions or genetic variants associated with phenotypes of interest, and thus, to identify design strategies that allow for the increase of the frequency of favorable alleles. Visual scores are important traits of cattle production in Brazil because they are utilized as selection criteria, helping to choose more harmonious animals. Despite its importance, there are still no studies on the genome association for these traits. This study aimed to identify genome regions associated with the traits of conformation, precocity and muscling, based on a visual score measured at weaning. Results Bayesian approaches with BayesC and Bayesian LASSO were utilized with 2873 phenotypes of Nellore cattle for a GWAS. The animals were genotyped with Illumina BovineHD BeadChip, and a total of 309,865 SNPs were utilized after quality control. In the analyses, phenotype and deregressed breeding values were utilized as dependent variables; a threshold model was utilized for the former and a linear model for the latter. The association criterion was the percentage of genetic variance explained by SNPs found in 1 Mb-long windows. The Bayesian approach BayesC was better adjusted to the data because it could explain a larger phenotypic variance for both dependent variables. Conclusions There were no large effects for the visual scores, indicating that they have a polygenic nature; however, regions in chromosomes 1, 3, 5, 7, 14, 15, 16, 19, 20 and 23 were identified and explained a large part of the genetic variance.

【 授权许可】

Unknown