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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

Mean total number (mean ± SE) and seasonal variation 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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fig2: Mean total number (mean ± SE) and seasonal variation 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: The mean number of ticks of the flock throughout the period was 3.0 ± 0.2 per animal, and the monthly means ranged from zero to 16.2 (Figure 2(a)). The highest mean number of ticks per animal occurred in August and September 2008 (16.2 ± 3.0 and 8.6 ± 1.5 ticks/animal, resp.), months when the mean temperatures were between 14 and 28°C. The counts of R. microplus exhibited a significant negative correlation (P < 0.05) with the mean minimum temperature (rs = −0.3734; P < 0.05) (Table 1).


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)

Mean total number (mean ± SE) and seasonal variation 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

fig2: Mean total number (mean ± SE) and seasonal variation 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: The mean number of ticks of the flock throughout the period was 3.0 ± 0.2 per animal, and the monthly means ranged from zero to 16.2 (Figure 2(a)). The highest mean number of ticks per animal occurred in August and September 2008 (16.2 ± 3.0 and 8.6 ± 1.5 ticks/animal, resp.), months when the mean temperatures were between 14 and 28°C. The counts of R. microplus exhibited a significant negative correlation (P < 0.05) with the mean minimum temperature (rs = −0.3734; P < 0.05) (Table 1).

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