title: Assessment of autozygosity in Nellore cows (Bos indicus) through high-density SNP genotypes.
abstract: The use of relatively low numbers of sires in cattle breeding programs, particularly on those for carcass and weight traits in Nellore beef cattle (Bos indicus) in Brazil, has always raised concerns about inbreeding, which affects conservation of genetic resources and sustainability of this breed. Here, we investigated the distribution of autozygosity levels based on runs of homozygosity (ROH) in a sample of 1,278 Nellore cows, genotyped for over 777,000 SNPs. We found ROH segments larger than 10 Mb in over 70% of the samples, representing signatures most likely related to the recent massive use of few sires. However, the average genome coverage by ROH (>1 Mb) was lower than previously reported for other cattle breeds (4.58%). In spite of 99.98% of the SNPs being included within a ROH in at least one individual, only 19.37% of the markers were encompassed by common ROH, suggesting that the ongoing selection for weight, carcass and reproductive traits in this population is too recent to have produced selection signatures in the form of ROH. Three short-range highly prevalent ROH autosomal hotspots (occurring in over 50% of the samples) were observed, indicating candidate regions most likely under selection since before the foundation of Brazilian Nellore cattle. The putative signatures of selection on chromosomes 4, 7, and 12 may be involved in resistance to infectious diseases and fertility, and should be subject of future investigation.
authors: Departamento de Medicina Veterinária Preventiva e Reprodução Animal, Faculdade de Ciências Agrárias e Veterinárias, UNESP - Univ Estadual Paulista Jaboticabal, São Paulo, Brazil.
authors: Ludmilla B
authors: LB
authors: Zavarez
authors: Departamento de Medicina Veterinária Preventiva e Reprodução Animal, Faculdade de Ciências Agrárias e Veterinárias, UNESP - Univ Estadual Paulista Jaboticabal, São Paulo, Brazil.
authors: Yuri T
authors: YT
authors: Utsunomiya
authors: Departamento de Medicina Veterinária Preventiva e Reprodução Animal, Faculdade de Ciências Agrárias e Veterinárias, UNESP - Univ Estadual Paulista Jaboticabal, São Paulo, Brazil.
authors: Adriana S
authors: AS
authors: Carmo
authors: GenSys Consultores Associados Porto Alegre, Rio Grande do Sul, Brazil ; Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias, UNESP - Univ Estadual Paulista Jaboticabal, São Paulo, Brazil.
authors: Haroldo H R
authors: HH
authors: Neves
authors: Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias, UNESP - Univ Estadual Paulista Jaboticabal, São Paulo, Brazil.
authors: Roberto
authors: R
authors: Carvalheiro
authors: Department of Animal Science, Faculty of Agriculture, University of Zagreb Zagreb, Croatia.
authors: Maja
authors: M
authors: Ferenčaković
authors: Division of Livestock Sciences, Department of Sustainable Agricultural Systems, BOKU - University of Natural Resources and Life Sciences Vienna, Austria.
authors: Ana M
authors: AM
authors: Pérez O'Brien
authors: Department of Animal Science, Faculty of Agriculture, University of Zagreb Zagreb, Croatia.
authors: Ino
authors: I
authors: Curik
authors: Animal Genomics and Improvement Laboratory, United States Department of Agriculture, Agricultural Research Service Beltsville, MD, USA.
authors: John B
authors: JB
authors: Cole
authors: Animal Genomics and Improvement Laboratory, United States Department of Agriculture, Agricultural Research Service Beltsville, MD, USA.
authors: Curtis P
authors: CP
authors: Van Tassell
authors: Bioinformatics and Animal Genomics Laboratory, Embrapa Dairy Cattle Juiz de Fora, Minas Gerais, Brazil.
authors: Marcos V G B
authors: MV
authors: da Silva
authors: Animal Genomics and Improvement Laboratory, United States Department of Agriculture, Agricultural Research Service Beltsville, MD, USA.
authors: Tad S
authors: TS
authors: Sonstegard
authors: Division of Livestock Sciences, Department of Sustainable Agricultural Systems, BOKU - University of Natural Resources and Life Sciences Vienna, Austria.
authors: Johann
authors: J
authors: Sölkner
authors: Departamento de Medicina Veterinária Preventiva e Reprodução Animal, Faculdade de Ciências Agrárias e Veterinárias, UNESP - Univ Estadual Paulista Jaboticabal, São Paulo, Brazil ; Laboratório de Bioquímica e Biologia Molecular Animal, Departamento de Apoio, Produção e Saúde Animal, Faculdade de Medicina Veterinária de Araçatuba, UNESP - Univ Estadual Paulista Araçatuba, São Paulo, Brazil.
authors: José F
authors: JF
authors: Garcia
keywords: Bos indicus; cattle; disease resistance; fertility; runs of homozygosity; selection