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

Ferraz da Costa Mdo S, Guimarães MP, Lima Wdos S, Ferraz da Costa AJ, Facury Filho EJ, Araujo RN - J Vet Med (2014)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Bloco i4, Sala 177, Avenida Antonio Carlos 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil.

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.

No MeSH data available.


Related in: MedlinePlus

Frequency distribution of Rhipicephalus microplus (a) and larvae of Dermatobia hominis (b) and Haematobia irritans (c) on heifers from Holstein × Gir crossbreeds from November 2007 to September 2009 in the northeast of Minas Gerais State, Brazil.
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Related In: Results  -  Collection


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fig3: Frequency distribution of Rhipicephalus microplus (a) and larvae of Dermatobia hominis (b) and Haematobia irritans (c) on heifers from Holstein × Gir crossbreeds from November 2007 to September 2009 in the northeast of Minas Gerais State, Brazil.

Mentions: Analysis of the distribution of parasites on experimental animals during all months of the year revealed that the percentage of animals with more than 10 ticks ranged from 0 to 25%, with the sole exception of August 2008, when 52.5% of the animals harbored more than 10 ticks (Figure 3(a)). During 15 months of the experiment, more than 50% of the animals were free of ticks.


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

Ferraz da Costa Mdo S, Guimarães MP, Lima Wdos S, Ferraz da Costa AJ, Facury Filho EJ, Araujo RN - J Vet Med (2014)

Frequency distribution of Rhipicephalus microplus (a) and larvae of Dermatobia hominis (b) and Haematobia irritans (c) on heifers from Holstein × Gir crossbreeds from November 2007 to September 2009 in the northeast of Minas Gerais State, Brazil.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4590873&req=5

fig3: Frequency distribution of Rhipicephalus microplus (a) and larvae of Dermatobia hominis (b) and Haematobia irritans (c) on heifers from Holstein × Gir crossbreeds from November 2007 to September 2009 in the northeast of Minas Gerais State, Brazil.
Mentions: Analysis of the distribution of parasites on experimental animals during all months of the year revealed that the percentage of animals with more than 10 ticks ranged from 0 to 25%, with the sole exception of August 2008, when 52.5% of the animals harbored more than 10 ticks (Figure 3(a)). During 15 months of the experiment, more than 50% of the animals were free of ticks.

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Bloco i4, Sala 177, Avenida Antonio Carlos 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil.

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.

No MeSH data available.


Related in: MedlinePlus