Risk factors related to resistance to Rhipicephalus (Boophilus) microplus and weight gain of heifers

dc.contributor.authorDa Silva, Jenevaldo Barbosa [UNESP]
dc.contributor.authorBarbosa, José Diomedes
dc.contributor.authorFonseca, Adivaldo Henrique
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal do Pará (UFPA)
dc.contributor.institutionDept. de Epidemiologia e Saúde Pública, Universidade Federal Rural de Rio de Janeiro, UFRRJ
dc.date.accessioned2018-12-11T16:58:39Z
dc.date.available2018-12-11T16:58:39Z
dc.date.issued2015-01-01
dc.description.abstractThe aim of the present study was to evaluate the influence of age and genetics in dairy heifers on resistance to the cattle tick Rhipicephalus (Boophilus) microplus and correlate these parameters with weight gain. Twenty-two heifers were evaluated from birth up to two years of age. Resistance to the cattle tick was evaluated by counting the number of engorged female ticks and subjective qualification of the larvae and nymph infestation. The animals were weighted in the first 24 hours after birth and at six, 12, 18 and 24 months of age. The average tick count and weight gain were compared by Tukey's test at 5% significance. Subsequently, linear regression was performed to verify the strength of the association between the risk factors age and genetics and infestation by R. (B.) microplus. Age and genetics were both significant risk factors for R. (B.) microplus infestation in heifers. Between the third and sixth months of age, the animals showed a window of susceptibility to R. (B.) microplus. Regardless of age, Bos taurus heifers had higher infestations than Bos indicus, crossbred F1 (1/2 B. taurus x 1/2 B. indicus) and crossbred Gir-Holstein (Girolando) (5/8 B. taurus x 3/8 B. indicus) heifers. B. taurus heifers were heavier than B. indicus heifers at birth and had significantly greater weight gain (p < 0.01).en
dc.description.affiliationDept. de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, FCAV/UNESP
dc.description.affiliationDepto de Ciência Animal, Universidade Federal Do Pará, UFPA
dc.description.affiliationDept. de Epidemiologia e Saúde Pública, Universidade Federal Rural de Rio de Janeiro, UFRRJ
dc.description.affiliationUnespDept. de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista, FCAV/UNESP
dc.format.extent2671-2677
dc.identifierhttp://dx.doi.org/10.5433/1679-0359.2015v36n4p2671
dc.identifier.citationSemina:Ciencias Agrarias, v. 36, n. 4, p. 2671-2677, 2015.
dc.identifier.doi10.5433/1679-0359.2015v36n4p2671
dc.identifier.issn1679-0359
dc.identifier.issn1676-546X
dc.identifier.scopus2-s2.0-84942312189
dc.identifier.urihttp://hdl.handle.net/11449/172099
dc.language.isoeng
dc.relation.ispartofSemina:Ciencias Agrarias
dc.relation.ispartofsjr0,320
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectBos indicus
dc.subjectBos taurus
dc.subjectResistance
dc.subjectRhipicephalus microplus
dc.subjectWeight gain
dc.titleRisk factors related to resistance to Rhipicephalus (Boophilus) microplus and weight gain of heifersen
dc.typeArtigo

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