02742naa a2200373 a 450000100080000000500110000800800410001902400340006010000180009424501910011226000090030352016480031265000140196065000110197465000140198565000130199965000280201265000100204065000100205065000140206065000100207465000230208465300210210765300170212865300220214565300260216770000180219370000160221170000250222770000180225270000150227070000180228577300650230320042212015-01-05       2014    bl uuuu     u00u1 u    #d7 a0.1186/s13071-014-0515-52DOI1 aGARCIA, M. V.  aContributions of the woolless sheep as a host for the maintenance of Rhipicephalus (Boophilus) microplus (AcaribIxodidae) populations in a pasture area in Brazil.h[electronic resource]  c2014  aAbstract: BackgroundHair 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.MethodsIn 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.ResultsTick 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.ConclusionWe 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.  aAnaplasma  aBrazil  aParasites  apastures  aRhipicephalus microplus  aSheep  aticks  aCarrapato  aOvino  aParasito de animal  aBiological cycle  aMetastigmata  aRaça Santa Inês  aSanta Ines hair sheep1 aANDREOTTI, R.1 aREIS, F. A.1 aAGUIRRE, A. de A. R.1 aBARROS, J. C.1 aMATIAS, J.1 aKOLLER, W. W.  tParasites & Vectors, Londongv. 18, n. 1, p. 1-4, Nov. 2014.