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Genetic parameters and investigation of genotype x environment interactions in Nellore x Hereford crossbred for resistance to cattle ticks in different regions of Brazil

dc.contributor.authorAyres, D. R. [UNESP]
dc.contributor.authorPereira, R. J. [UNESP]
dc.contributor.authorBoligon, A. A. [UNESP]
dc.contributor.authorBaldi, F. [UNESP]
dc.contributor.authorRoso, V. M.
dc.contributor.authorAlbuquerque, L. G. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Fed MatoGrosso
dc.contributor.institutionGenSys Consultores Associados SS Ltda
dc.date.accessioned2015-10-21T20:37:28Z
dc.date.available2015-10-21T20:37:28Z
dc.date.issued2015-02-01
dc.description.abstractData from 6,156 Nellore x Hereford crossbred cattle, distributed in 18 herds located in the Brazilian states of Mato Grosso do Sul (MS), So Paulo (SP), Parana (PR) and Rio Grande do Sul (RS), were analysed in order to investigate genetic variation for resistance to the cattle tick through the estimation of variance components and genetic parameters for counting ticks (Rhipicephalus (Boophilus) microplus) in natural infestation, and also a possible genotype x environment interaction. The tick count data (CC) were transformed to log(10)(CC + 1) and grouped into two regions, defined by cluster analysis and analysed using the method of restricted maximum likelihood. The statistical model included the additive genetic effect as random and fixed effects of the contemporary group (CG) and genetic group (GG) as classificatory and the age of the animal at the time of counting (linear effect) and individual heterozygosity (linear effect, ranging from 0 to 1) as covariates. In the studied regions, the effect of heterosis found was inversely proportional; in other words, the count of ticks decreased with the increase of heterozygosity. The observed heritability estimation for resistance to tick infestation were 0.12 +/- 0.04 and 0.11 +/- 0.04 for groups A (RS and south PR) and B (MS, SP and north PR), respectively. The results of this study suggest that selection for animals resistant to ticks would be possible using the tick count to estimate the genetic value of animals, but with a slow genetic progress. The genetic correlation for tick count between the two groups (A and B) was 0.84 +/- 0.27 and genotype x environment interaction for this trait was not observed in the studied population.en
dc.description.affiliationUniv Estadual Paulista, Dept Zootecnia, Fac Cincias Agr &Vet, BR-14884900 Jaboticabal, SP, Brazil
dc.description.affiliationUniv Fed MatoGrosso, Grp Melhoramento Anim Mato Grosso GMAT, Inst Ciencias Agr &Tecnol, BR-78735001 Campus Rondonopolis, MT, Brazil
dc.description.affiliationGenSys Consultores Associados SS Ltda, Porto Alegre, RS, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Zootecnia, Fac Cincias Agr &Vet, BR-14884900 Jaboticabal, SP, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent107-113
dc.identifierhttp://link.springer.com/article/10.1007%2Fs13353-014-0238-5
dc.identifier.citationJournal Of Applied Genetics. Heidelberg: Springer Heidelberg, v. 56, n. 1, p. 107-113, 2015.
dc.identifier.doi10.1007/s13353-014-0238-5
dc.identifier.issn1234-1983
dc.identifier.urihttp://hdl.handle.net/11449/129219
dc.identifier.wosWOS:000348119600012
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofJournal Of Applied Genetics
dc.relation.ispartofjcr1.756
dc.relation.ispartofsjr0,704
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectBeef cattleen
dc.subjectEctoparasitesen
dc.subjectREMLen
dc.titleGenetic parameters and investigation of genotype x environment interactions in Nellore x Hereford crossbred for resistance to cattle ticks in different regions of Brazilen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer
unesp.author.orcid0000-0002-2030-7590[6]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt
unesp.departmentZootecnia - FCAVpt

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