Seasonal Variation and Frequency Distribution of Ectoparasites in Crossbreed Cattle in Southeastern Brazil

  • Ferraz da Costa M
  • Guimarães M
  • Lima W
  • et al.
N/ACitations
Citations of this article
14Readers
Mendeley users who have this article in their library.

Abstract

The aims of this study were to evaluate the seasonal variation and frequency distribution of Rhipicephalus (Boophilus) microplus , Haematobia irritans , and Dermatobia hominis on crossbred heifers under field conditions in the northeast of Minas Gerais state, southeastern Brazil. From November 2007 to September 2009 (23 months), 40 heifers aged 16.6±2.4 months were divided into groups A ( 1/4 Holstein × 3/4 Gir) and B ( 1/2 Holstein × 1/2 Gir) and had the monthly infestation estimated along with the climatic conditions. The mean maximum and minimum temperatures were 28.5 and 19°C, respectively. The ectoparasites were present on animals in all months of the year. The levels of ticks on the animals were low ( 3.0±0.2 ticks/animal), with the highest density in midwinter. The temperature was the climatic factor that most influenced the tick levels. The population of H. irritans ( 13.9±0.3 flies/animal) and D. hominis ( 1.5±0.2 larvae/animal) on heifers was more influenced by rainfall and exhibited two population peaks during the year. 1/2 Holstein heifers harbored significantly more H. irritans and D. hominis than 1/4 Holstein heifers. The results are discussed considering the most appropriate periods to apply ectoparasiticides and the genetic make-up of the animals.

Cite

CITATION STYLE

APA

Ferraz da Costa, M. do S., Guimarães, M. P., Lima, W. dos S., Ferraz da Costa, A. J., Facury Filho, E. J., & Araujo, R. N. (2014). Seasonal Variation and Frequency Distribution of Ectoparasites in Crossbreed Cattle in Southeastern Brazil. Journal of Veterinary Medicine, 2014, 1–8. https://doi.org/10.1155/2014/759854

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free