title: Contributions of the hair sheep breed Santa Ines as a maintenance host for Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) in Brazil.
abstract: BACKGROUND
  Hair sheep breeds are a new, cost-effective option for the diversification of livestock in the Midwest region of Brazil. They are grazed extensively with cattle as well as in isolation in small areas. Hair sheep breeds are vulnerable to infestation by parasites such as the cattle tick, Rhipicephalus microplus, which causes various types of damage and can transmit diseases.
  
  
  METHODS
  In this study, Santa Inês hair sheep were naturally infested in an area contaminated by infested cattle and then monitored to determine the ability of these animals to maintain the local tick population in the absence of cattle. After engorged tick females of each generation fell off, the animals were placed in another pasture and were returned only after larvae reappeared in the original pasture.
  
  
  RESULTS
  Tick counts were performed every ten days for three generations of sheep, and average infestations per animal of 34, 12 and 4 ticks were observed for each successive generation. These numbers suggest the acquisition of resistance; however, additional studies are needed to ensure resistance is achieved. The average length of the parasitic phase for each generation of ticks was 25 days.
  
  
  CONCLUSIONS
  We concluded that this hair sheep breed, even if kept separate from cattle, is able to maintain tick populations for at least three generations, although a gradual decrease in the population levels of R. microplus over three generations was observed. We also detected two positive cases of Anaplasma spp. Therefore, it appears that the Santa Inês hair sheep breed contributes to the circulation of this bacterium among other ruminants.
authors.affiliation: Molecular Biology Laboratory, Embrapa Beef Cattle, Campo Grande, MS, Brazil. marcosvagar@gmail.com.
authors.forename: Marcos Valério
authors.initials: MV
authors.lastname: Garcia
authors.affiliation: Molecular Biology Laboratory, Embrapa Beef Cattle, Campo Grande, MS, Brazil. renato.andreotti@embrapa.br.
authors.forename: Renato
authors.initials: R
authors.lastname: Andreotti
authors.affiliation: Embrapa Goats and Sheeps, Sobral, CE, Brazil. fernando.reis@embrapa.br.
authors.forename: Fernando Alvarenga
authors.initials: FA
authors.lastname: Reis
authors.affiliation: Graduate Program of Infectious and Parasitic Diseases, School of Medicine, Universidade Federal de Mato Grosso do Sul (UFMS), Campo Grande, MS, Brazil. andreaguirrevet@hotmail.com.
authors.forename: André de Abreu Rangel
authors.initials: Ade A
authors.lastname: Aguirre
authors.affiliation: Molecular Biology Laboratory, Embrapa Beef Cattle, Campo Grande, MS, Brazil. jacqueline.barros@embrapa.br.
authors.forename: Jacqueline Cavalcante
authors.initials: JC
authors.lastname: Barros
authors.affiliation: Graduate Program of Infectious and Parasitic Diseases, School of Medicine, Universidade Federal de Mato Grosso do Sul (UFMS), Campo Grande, MS, Brazil. jaqmatias@hotmail.com.
authors.forename: Jaqueline
authors.initials: J
authors.lastname: Matias
authors.affiliation: Molecular Biology Laboratory, Embrapa Beef Cattle, Campo Grande, MS, Brazil. wilson.koller@embrapa.br.
authors.forename: Wilson Werner
authors.initials: WW
authors.lastname: Koller
mesh_terms: D000818:Animals; D048494:Rhipicephalus / Q000502:physiology*; D012756:Sheep; D012757:Sheep Diseases / Q000453:epidemiology / Q000469:parasitology*; D013984:Tick Infestations / Q000453:epidemiology / Q000662:veterinary*; D013997:Time Factors