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      Oestrus ovis in Ecuador: Importance in the Andean sheep farming

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          Abstract

          Aim:

          This study aimed to determine the prevalence of Oestrus ovis in sheep meant for meat commercialization in the main slaughterhouse of the country.

          Materials and Methods:

          Between October 2015 and December 2015, we assessed the occurrence of Oestrus myiasis in the main slaughterhouse localized in Quito. In total, 80 sheep heads were randomly inspected and necropsied. Larvae were removed from nasal cavities and paranasal sinuses and cleaned. ANOVA (generalized linear model) was used to estimate the relationship between sex, age, and place of origin and presence or absence of parasite larvae.

          Results:

          Morphological identification confirmed that 19% (15/80) of the examined animals were positive for Oestrus ovis; from the positive cases, 21% were young animals <12 months old. We found that statistical differences by animal sex, males, were most infested 93% (14/15) than females 7% (1/15). Larvae’s L2 were more abundant than other stages (62 of the total 149). 14 of the infested animals were from the Andean places at > 2500 meters above sea level (m.a.s.l.), and only one case from the coastal region at 250 m.a.s.l. with tropical environmental conditions.

          Conclusions:

          Our results showed evidence of the presence of myiasis caused by O. ovis in Andean and coastal places in Ecuador and its adaptation to different environmental conditions from that reported previously in temperate regions from Europe and Africa.

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          Most cited references 26

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          Conjunctival ophthalmomyiasis caused by the sheep nasal botfly (Oestrus ovis)

          Three patients had conjunctival ophthalmomyiasis caused by the ovine nasal botfly. All patients had a sudden onset of redness, tearing, and foreign-body sensation of the affected eye. One to nine Oestrus ovis first-instar larvae were removed from the bulbar or palpebral conjunctiva of each patient. Symptoms and clinical signs resolved after mechanical removal of the larvae. Specific taxonomic diagnosis of O. ovis larvae was determined on the basis of characteristic conformation of the terminal end of the larval caudal segment as seen by use of light microscopy.
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            Epidemiology of Oestrus ovis infestations in sheep in Kars province of north-eastern Turkey.

             O. Arslan,  M Kara,  Y Gicik (2009)
            This study was carried out to determine the prevalence of cavical myiasis caused by Oestrus ovis larvae in sheep of Kars province of north-eastern part of Turkey. From 30 to 35 sheep heads (total of 387) were examined every month regularly for O. ovis larvae during 12 months. Of 387 heads, 156 (%40.3) were infested with O. ovis larvae.. The prevalence of nasal myiasis was 54.3% in spring, 41% in summer, 28% in fall, and 38.9% in winter. The differences among seasons were significant statistically (P<0.05). Infestation rate up to 1-years-old was 30.0%, 1 to 3 years-old 40.0% and older than 3 years old was 52.4%. The number of larvae made peak in spring months and went down in the months of fall. The mean number of larvae regarding examined animals was 1.8, and the mean according to infested animals was 4.5. Density of O.ovis larvae in infested sheep were changed from 1 to 31. Infestation rate in the morkaraman breed was higher (43.4%) comparing to the rate in the akkaraman breed (31.3%). The differences between sheep breed were also significant (p<0.05). Sheep with dark colored head had higher infestation rate than that of sheep with light colored head (p<0.05).
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              Epidemiology of Oestrus ovis L. (Diptera: Oestridae) larvae in sheep and goats in Greece

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                Author and article information

                Journal
                Vet World
                Vet World
                Veterinary World
                Veterinary World (India )
                0972-8988
                2231-0916
                2019
                14 April 2019
                : 12
                : 4
                : 522-526
                Affiliations
                [1 ]Department of Parasitology, Medicine, Veterinary and Zootechnic Faculty, Central University of Ecuador, EC170521, Quito, Ecuador
                [2 ]Wildlife Conservation Research Unit, Central University of Ecuador, EC170521, Quito, Ecuador
                [3 ]Parasitology Unit, Public Health and Zoonosis Research Institute, Central University of Ecuador EC170521, Quito, Ecuador
                Author notes
                Corresponding author: Richar Rodríguez-Hidalgo, e-mail: rrodriguez@ 123456uce.edu.ec Co-authors: GO: gabyortega90@ 123456gabyortega90 , NL: nluzuriaga@ 123456nluzuriaga , RS: rsalazar@ 123456uce.edu.ec
                Article
                VetWorld-12-522
                10.14202/vetworld.2019.522-526
                6515834
                31190706
                Copyright: © Ortega-Muñoz, et al.

                Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

                Categories
                Research Article

                ecuador, ecuadorian highlands, oestrosis, oestrus ovis, sheep

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