Analysis of the risk factors related to the immune humoral anti-Anaplasma marginale in dairy cattle

Autores

  • Jenevaldo Barbosa da Silva UFRRJ
  • Adivaldo Henrique da Fonseca Universidade Federal Rural do Rio de Janeiro

DOI:

https://doi.org/10.5433/1679-0359.2013v34n2p777

Palavras-chave:

Anaplasma marginale, Immunodiagnostic, Postpartum, Prevalence.

Resumo

Anaplasma marginale is the most prevalent pathogen of cattle transmitted by ticks in the world. This study aimed to evaluate the risk factors for anaplasmosis in dairy cattle. Fifty dairy cattle from the herd of Empresa de Pesquisa Agropecuaria do Estado do Rio de Janeiro were selected by proportional stratified sampling. The risk factors evaluated were: physiological state, race pattern, number of lactations, milk production, infestation by Rhipicephalus microplus and animal density. Antibody activity against A. marginale was determined using the indirect enzyme-linked immunosorbent assay. The percentual values of seroprevalence for A. marginale were submitted to ?2 test, and the level of minimum significance, to keep a factor in the model of logistic regression, was fixated in 5%. It was observed that pregnancy and lactation influenced significantly (p<0.05) in the seropositivity of the animals. Bos indicus animals had 5.21 times more chances of being seropositive than B. taurus animals. Primiparous female had 88% more chances of being seropositive than pluriparous female. Animals with high milk production were 63% more positive than low production animals. When infested by ticks the animals had 39% more chance of being seropositive to A. marginale. Bos indicus animals presented 5.21 times more chance of being seropositive than B. taurus animals. Primiparous females presented 88% more chance of being seropositive than the pluriparous ones. High milk production animals were 63% more positive than the low production ones. When infested by ticks the animals had 39% more chance of being seropositive to A. marginale. High density grazing provided for the animals 3.2 times more chances of being seropositive than low density ones. The herd was classified as erratic to A. marginale, even being placed in a steady enzootic area.

 

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Biografia do Autor

Jenevaldo Barbosa da Silva, UFRRJ

Médico Veterinário formado pela UFRRJ. Pos graduando em Ciências Veterinarias pela UFRRJ. Atua nas áreas de Helmintologia e Doenças Transmitidas por Carrapatos.

Adivaldo Henrique da Fonseca, Universidade Federal Rural do Rio de Janeiro

Prof. da Universidade Federal Rural do Rio de Janeiro, UFRRJ, Seropédica, RJ.

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Publicado

2013-05-14

Como Citar

Silva, J. B. da, & Fonseca, A. H. da. (2013). Analysis of the risk factors related to the immune humoral anti-Anaplasma marginale in dairy cattle. Semina: Ciências Agrárias, 34(2), 777–784. https://doi.org/10.5433/1679-0359.2013v34n2p777

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