Epidemiology of Oestrus ovis infection of sheep in northeast Spain (mid-Ebro Valley)

Lamelas, María Teresa; Lucientes, Javier; Peribáñez, Miguel A.; Castillo, Juan Antonio; Calvete, C.; Ferrer, Luís Miguel

doi:10.1007/s11250-009-9503-8

Cited by 24 publications

(22 citation statements)

References 15 publications

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“…The mean intensity of infestation reported in this study (16.8) was similar to that previously reported in Sardinia, Italy (SCALA et al, 2001) and Southwestern Spain (ALCAIDE et al, 2003), with mean intensities of 19 and 18.5 larvae per infested head, respectively; but lower than that found in Southwestern France with 24.8 larvae (YILMA;DORCHIES, 1991) and Northeastern Spain with 37.9 (GRACIA et al, 2010). It is noteworthy that a high percentage of first larval instar were found by those authors, especially during the colder months.…”

Section: Discussionsupporting

confidence: 89%

Epidemiology of Oestrus ovis (Diptera: Oestridae) in sheep in Botucatu, State of São Paulo

Silva

Bassetto

Amarante

2012

Rev. Bras. Parasitol. Vet.

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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 head infested was 16.8 larvae, with an average of 7.8 L1, 5.3 L2 and 3.7 L3. O. ovis larvae were present during the four seasons of the year, but the mean larval burden was significantly higher during the spring and summer months, compared to winter (P < 0.05). The highest rate of larvae recovery coincided with mean temperatures between 20 °C and 25 °C and air relative humidity around 70%. Results suggest that evolution and development of O. ovis practically occurs throughout the entire year, with larval infestation especially frequent during the spring and summer months.Keywords: Oestrus ovis, epidemiology, sheep. ResumoOs fatores sazonais que influenciam a infestação por larvas de Oestrus ovis, foram determinados no período de abril de 2008 a março de 2011, em ovinos criados em Botucatu, São Paulo, região Sudeste do Brasil. Mensalmente, dois cordeiros traçadores permaneceram em pastejo com um rebanho ovino durante 28 dias consecutivos, expostos à infestação natural por larvas de O. ovis. Em seguida, os cordeiros foram sacrificados, e as larvas de O. ovis recuperadas da cavidade nasal e seios frontais. Dos 72 cordeiros traçadores, 50% estavam infestados por larvas de O. ovis, com intensidade média de infestação de 16,8 larvas/cabeça infestada, com média de 7,8 L1, 5,3 L2 e 3,7 L3. As larvas de O. ovis foram recuperadas durante as quatro estações do ano, mas o número médio de larvas foi significativamente superior durante os meses de primavera e verão comparado aos meses de inverno (P < 0,05). A maior taxa de recuperação larval coincidiu com temperaturas médias entre 20 °C e 25 °C e umidade relativa do ar por volta de 70%. Os resultados sugerem que a evolução e desenvolvimento de O. ovis ocorre praticamente durante o ano inteiro, mas a infestação é mais frequente nos meses de primavera e verão.

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Section: Discussionsupporting

confidence: 89%

Epidemiology of Oestrus ovis (Diptera: Oestridae) in sheep in Botucatu, State of São Paulo

Silva

Bassetto

Amarante

2012

Rev. Bras. Parasitol. Vet.

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“…When compared with the studies from the world, while it was higher than in Libya (51.66%) (Negm-Eldin et al, 2015), Greece (48.6%) (Papadopoulos et al, 2006), Saudi Arabia (53.5%) (Hanan, 2013) and Brazil (13.7%) (Silva et al, 2013), it was lower than in Central Oramina Ethipia (94.6%) (Alem et al, 2010) and Italy (91%) (Scala et al, 2001). The ratios are similar with those from Spain (71.1% and 75.9%) (Alcaide et al, 2003;Gracia et al, 2010), Morocco and Greece (69.2% and 75.9%) (Pandey and Ouhelli, 1984;Papadopoulos et al, 2010). No studies have been encountered investigating the prevalence of oestrosis in goats.…”

Section: Resultssupporting

confidence: 50%

Prevalence and intensity of Oestrus ovis in sheep and goats in south-eastern part of Turkey

İpek

2017

IJAR

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Oestrosis is a parasitic disease which is prevalent among sheep and goats in Mediterranean region. Slaughter house surveys to determine the prevalence and intensity of infestation by Oestrus ovis Linnaeus (Diptera: Oestridae) in sheep and goats, were conducted monthly for one year in south-eastern region of Turkey. A total of 804 heads belonging to 724 sheep and 80 goats were examined for Oestrus ovis larvae between May 2014 and April 2015. 72.75% of sheep heads and 50% of goat heads were seen to be infested with Oestrus ovis larvae. Of a total of 4723 larvae found in sheep heads, 2245 were detected to be first instars larva, 1231 second instars larva, 1247 third instars larva. Of a total of 259 larvae detected in goats, 150 were first instars larva, 79 second instars larva, 30 third instars larva. The mean of larval burden per infested animal was significantly higher in sheep (8.8±5.9) than in goat (6.5±5.0) (P < 0.05). Monthly distribution of first, second and third instars larvae indicate that adult flies are active between April and end of September, first instars larvae enter hypobiotic period in October. In conclusion, it was revealed that to use an effective drug against Oestrus ovis that will be done during reproductive period of flies should start in April and continue until the end of summer due to high rates of oestrosis, parasite treatment that will be done when reproductive period ends should be done in October and November in the southeast part of Turkey.

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“…In Saudi Arabia, Hanan (2013) found 53.5% which is lower compared to data from Spain, which described a range of prevalence between 71.1% and 82.4% (Alcaide et al 2003, Gracia et al 2010. Research done in Morocco and Greece found similar prevalence rates (69.2% and 75.9%), although the weather in these countries are different (Pandey & Ouhelli 1984, Papadopolus et al 2010).…”

Section: Discussionmentioning

confidence: 92%

Oestrus ovis infection of grazing sheep during summer in southern Chile

et al. 2015

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ABSTRACT. - Oestrus ovis is a botfly whose larvae cause nasal myiasis, an environmental-dependent disease in small ruminants, generating acute and chronic injuries in the cranial cavities of sheep. Chile is a country of the southernmost worldwide distribution of this parasite, and there is few information about. Whence, the objective of this study was to approximate the epidemiological situation of O. ovis infection in Chilean sheep. From December 2009 to March 2010, a total of 87 samples were obtained by necropsy for skull inspection. The larvae were collected, and microscopically identified. The prevalence in the sampled sheep was 60.9%. From those that were infected, 85.7% (18/21) of sheep were 1 to 3 years old, constituting the stratum with the highest prevalence. The difference of infection in females and males was not significant. The high risk of infection seems to be dependent upon the environmental conditions of this southern region, especially during summer when the first larval stage (L1) could be found as the evidence. Therefore, the disease should be considered as a significant problem for this kind of livestock production.

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Epidemiology of Oestrus ovis infection of sheep in northeast Spain (mid-Ebro Valley)

Cited by 24 publications

References 15 publications

Epidemiology of Oestrus ovis (Diptera: Oestridae) in sheep in Botucatu, State of São Paulo

Epidemiology of Oestrus ovis (Diptera: Oestridae) in sheep in Botucatu, State of São Paulo

Prevalence and intensity of Oestrus ovis in sheep and goats in south-eastern part of Turkey

Oestrus ovis infection of grazing sheep during summer in southern Chile

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