2012
DOI: 10.1590/s1984-29612012000400008
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Abstract: The seasonal factors that influence Oestrus ovis infestation in sheep were determined in Botucatu, State of São Paulo, Southwestern Brazil, from April 2008 to March 2011. Two tracer lambs were monthly exposed to natural infestation by O. ovis larvae for 28 consecutive days, by grazing with a sheep flock. Tracer animals were then euthanized and the larvae of O. ovis recovered from nasal and sinus cavities. Of the 72 tracer lambs, 50% were infested with O. ovis larvae and the mean intensity of infestation per he… Show more

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Cited by 19 publications
(26 citation statements)
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“…Higher prevalence was also observed in other Brazilian studies: 85.4% in the south region of the country in sheep exposed to natural infestation for one year (RIBEIRO et al, 1990) and 50% prevalence in tracer sheep in Botucatu, State of São Paulo, Brazil (SILVA et al, 2012).…”
Section: Discussionsupporting
confidence: 68%
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“…Higher prevalence was also observed in other Brazilian studies: 85.4% in the south region of the country in sheep exposed to natural infestation for one year (RIBEIRO et al, 1990) and 50% prevalence in tracer sheep in Botucatu, State of São Paulo, Brazil (SILVA et al, 2012).…”
Section: Discussionsupporting
confidence: 68%
“…The low prevalence of oestrosis in these animals may have been influenced by previous treatment with drugs, such as macrocyclic lactones, which are usually used for the prophylaxis of infections by gastrointestinal nematodes and act against O. ovis larvae instars (DORCHIES et al, 1996(DORCHIES et al, , 1997LUCIENTES et al, 1998). The influence of anthelmintic treatment in O. ovis epidemiology was also observed in Botucatu, where reduction in the infestation of tracer sheep coincided with the treatment of flocks with macrocyclic lactones (SILVA et al, 2012).…”
Section: Discussionmentioning
confidence: 99%
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“…Ramos et al (2006) reported no findings under 9.8°C, suggesting that the most influential factor was the temperature. Likewise, other authors agree that the optimum temperatures occur in summer and spring (Silva et al 2012). According to local meteorological records, the registered environmental conditions were optimal for the development of new infections by O. ovis in southern Chile.…”
Section: Discussionmentioning
confidence: 73%
“…Portanto, as condições climáticas dos municípios avaliados foram ideais para o desenvolvimento do ciclo da mosca, principalmente em São Gonçalo dos Campos onde ocorreram casos em praticamente todos os meses do ano, corroborando com o que já está descrito na literatura com temperatura entre 20 a 30°C e umidade relativa do ar em torno de 70%. Nestas condições Silva et al (2012), constataram uma alta taxa de recuperação de larvas, enquanto nenhuma larva foi recuperada quando a média da temperatura mínima foi abaixo de 14 ºC.…”
Section: Discussionunclassified