Epidemiology of Oestrus ovis infestations in sheep in Kars province of north-eastern Turkey

Arslan, Mükremin Özkan; Kara, Murat; Gicik, Yunus

doi:10.1007/s11250-008-9190-x

Cited by 33 publications

(57 citation statements)

References 18 publications

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“…The larvae collection was similar to those recorded by Arslan et al (2009) andSilva (2013), who both indicate that the numbers of L1 were much less than L2 and L3. Furthermore, they each conclude that most of the L3 larvae in the early summer, probably as a survival strategy, given that the larvae did not complete their cycle due to unfavorable weather conditions (Tabouret et al 2001).…”

Section: Discussionsupporting

confidence: 83%

“…Although Arslan et al (2009) found that animals older than three years showed a higher prevalence (52.4%), this is consistent with the direct relationship between age and risk of infection over time. In sheep under 1 year, the percentage of infection was lower, coinciding with the distributions observed for Arslan et al (2009) and Silva et al (2013). It could be considered that in southern Chile the infection of lambs is late because the optimal environmental conditions for the larval lay process of female flies begins around spring probably.…”

Section: Discussionsupporting

confidence: 82%

“…There is a consensus that the pathogenic effects of this infection cause a long-term decline of the immune response and body condition of sheep (Godara et al 2009). Adding to these problems is the difficult control of this parasitism in the environment and the great disparity of its treatments (Arslan et al 2009). …”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 83%

Section: Discussionsupporting

confidence: 82%

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Oestrus ovis infection of grazing sheep during summer in southern Chile

et al. 2015

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“…The prevalence of O. ovis infestation (13.7%) in this study was lower than those reported in similar studies carried out in other countries such as France, where 65% of sheep was infested with O. ovis larvae (YILMA; DORCHIES, 1991); or in Sicily, with 55.8% of prevalence (CARACAPPA et al, 2000); and Turkey, with 40.6% (ARSLAN et al, 2009). 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: Discussioncontrasting

confidence: 76%

Prevalence of Oestrus ovis(Diptera: Oestridae) in sheep from the São Paulo Central region, Brazil

Silva

Machado

Izidoro

et al. 2013

Rev. Bras. Parasitol. Vet.

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The heads of 139 slaughtered sheep were examined with the aim of determining Oestrus ovis prevalence and infestation intensity in the central region of the State of São Paulo, Brazil. Heads from slaughtered sheep were examined and the first (L1), second (L2) and third (L3) O. ovis larval instars were recovered from the nasal and sinus cavities. O. ovis larvae were detected in 13.7% of the sheep analyzed. The monthly mean intensity of infestation ranged from 1 to 10.2 larvae per infested head, with general mean intensity of 4.5 larvae/infested head. Of the total of 85 larvae, 21.2% were L1, 37.6% L2 and 41.2% L3. In conclusion, all different O. ovis larvae instars were recovered from slaughtered animals, which demonstrates the existence of favorable climatic conditions for the fly activity and larval development of O. ovis in sheep raised in the Central region of the State of São Paulo.Keywords: Oestrus ovis, sheep, prevalence. ResumoCom o objetivo de determinar a prevalência e intensidade de infestação por larvas de Oestrus ovis na região Central do Estado de São Paulo, 139 cabeças de ovinos obtidas de um abatedouro foram examinadas. As larvas O. ovis foram recuperadas da cavidade nasal e seios frontais, identificadas de acordo com o estádio larval e quantificadas. As larvas de O. ovis foram detectadas em 13,7% das cabeças examinadas e a intensidade média mensal de infestação variou entre 1 a 10,2 larvas/cabeça infestada, com média geral de 4,5 larvas/cabeça infestada. Do total de 85 larvas recuperadas, 21,2% eram larvas de primeiro estádio (L1), 37,6% de segundo (L2) e 41,2% de terceiro (L3). Em conclusão, todos os diferentes instares larvais de O. ovis foram recuperados de animais abatidos, o que demonstra a existência de condições climáticas favoráveis para a atividade da mosca bem como o desenvolvimento larval em ovinos criados na região Central do Estado de São Paulo.Palavras-chave: Oestrus ovis, ovino, prevalência.

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“…The difference between results may be explained in part by the fact that in Bagé, the animals were exposed to O. ovis infestation for a longer period of time (from one month to one year), while in the present experiment the sheep were exposed for just 28 days. Moreover, other factors may have influenced the O. ovis epidemiology, such as the climatic conditions of each region, size of sheep flock and management, which can result in a variable prevalence, as demonstrated by numerous studies conducted in slaughterhouses in different countries (YILMA;DORCHIES, 1991;ABO-SHEHADA et al, 2000;SCALA et al, 2002;ALCAIDE et al, 2003;ARSLAN et al, 2009;SHOORIJEH et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

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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Epidemiology of Oestrus ovis infestations in sheep in Kars province of north-eastern Turkey

Cited by 33 publications

References 18 publications

Oestrus ovis infection of grazing sheep during summer in southern Chile

Oestrus ovis infection of grazing sheep during summer in southern Chile

Prevalence of Oestrus ovis(Diptera: Oestridae) in sheep from the São Paulo Central region, Brazil

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

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