Contributions of the hair sheep breed Santa Ines as a maintenance host for Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) in Brazil

Particle and Fibre Toxicology

Wilson Werner Koller¹  Jaqueline Matias²  Jacqueline Cavalcante Barros¹  André de Abreu Rangel Aguirre²  Fernando Alvarenga Reis³  Renato Andreotti¹  Marcos Valério Garcia¹ 

[1] Molecular Biology Laboratory, Embrapa Beef Cattle, Campo Grande, MS, Brazil;Graduate Program of Infectious and Parasitic Diseases, School of Medicine, Universidade Federal de Mato Grosso do Sul (UFMS), Campo Grande, MS, Brazil;Embrapa Goats and Sheeps, Sobral, CE, Brazil

关键词: Brazil;    Biological cycle;    Pastures;    Santa Ines hair sheep;    Rhipicephalus microplus;   

Others  :  1149298
DOI  :  10.1186/s13071-014-0515-5

 received in 2014-06-19, accepted in 2014-11-01,  发布年份 2014

【 摘 要 】

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.

Conclusion

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.

【 授权许可】

   
2014 Garcia et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

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