{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T02:44:40Z","timestamp":1768877080327,"version":"3.49.0"},"reference-count":107,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2021,1,11]],"date-time":"2021-01-11T00:00:00Z","timestamp":1610323200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["SFRH\/BD\/65407\/2009"],"award-info":[{"award-number":["SFRH\/BD\/65407\/2009"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e Tecnologia","award":["UIDP\/00276\/2020"],"award-info":[{"award-number":["UIDP\/00276\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Animals"],"abstract":"<jats:p>In Portugal, equine parasitism in pasture animals is characterized by high parasitic burden and high helminthic biodiversity; both factors are potentially pathogenic for their hosts. The decrease in the number of donkeys over the last years in Portugal, their importance in rural lowland and mountain ecosystems and pastures and the scarce information regarding their parasitism led to this research, which aimed to evaluate the parasitological status of a Miranda donkey breed population, a native breed mainly located in the northeast of Portugal. This study provides better knowledge of their gastrointestinal parasitism, particularly strongyles, and the assessment of a targeted selective treatment (TST) as an alternative control approach of their parasitism. A longitudinal observational study was developed during a period of five years in a population of 62 Miranda donkeys. At first, strategic deworming of these animals was performed every semester, but this was progressively replaced by a TST approach according to the levels of Eggs per Gram (EPG). This new deworming strategy was conducted in association with a regular parasitological monitoring of the animals every three months, being dewormed with ivermectin when egg shedding was higher than 500 EPG. Over the study period, a decrease of the annual prevalence rate of infection by gastrointestinal strongyles was observed, from 35.5% to 19.4%, as well as a negative binomial distribution of parasitic strongyles in donkeys submitted to selective anthelminthic control. The prevalence rate of infection was higher in females (39.5%), in individuals under four years (46.7%) and in those presenting a lower body condition (40.8%). The egg output was higher in animals younger than four years (589.3 EPG) than in those older than 10 years (533.6 EPG) (p &lt; 0.05). However, no differences were observed according to sex during the study period. Results from this study allowed to note the influence of swampy pastures and of the weather changes in the epidemiology of strongylosis in Miranda donkeys. Moreover, it was possible to establish the annual epidemiological curve of strongyle egg shedding, with June being the month with the highest EPG, December having the lowest EPG and March and September showing intermediate numbers. Overall, a lower biodiversity of gastrointestinal parasites was observed. Cyathostomum sensu lato was the most prevalent genus and Strongylus vulgaris was the most observed large strongyle of the Strongylidae family. Trichostrongylus axei and Parascaris sp. were other nematodes with a minor frequency. The higher prevalence of strongyles at the beginning of the study showed a progressive decrease throughout the research period, and also for parasite biodiversity. Therefore, a targeted selective treatment seems to be a rational anthelminthic control approach in Miranda donkey strongyle infection and in other gastrointestinal parasites, since it reduces the antiparasitic treatments, the parasite\u2019 prevalence and the EPG level. However, a loss of parasite biodiversity was noted at the end of the study period, as Cyathostominae were the only isolated strongyles. This can be a challenging situation in the long run, taking the ability of these nematodes to adapt easily to any deworming program, meaning that fecal EPG monitoring should be kept as a rule to a rational parasite control program.<\/jats:p>","DOI":"10.3390\/ani11010155","type":"journal-article","created":{"date-parts":[[2021,1,11]],"date-time":"2021-01-11T11:36:11Z","timestamp":1610364971000},"page":"155","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Gastrointestinal Parasitism in Miranda Donkeys: Epidemiology and Selective Control of Strongyles Infection in the Northeast of Portugal"],"prefix":"10.3390","volume":"11","author":[{"given":"S\u00e9rgio","family":"Ramalho Sousa","sequence":"first","affiliation":[{"name":"Vasco da Gama Research Centre (CIVG), Department of Veterinary Sciences, Vasco da Gama University School, Avenida Jos\u00e9 R. Sousa Fernandes 197 Lordem\u00e3o, 3020-210 Coimbra, Portugal"},{"name":"CIISA\u2014Centro de Investiga\u00e7\u00e3o Interdisciplinar em Sanidade Animal, Faculdade de Medicina Veterin\u00e1ria, Universidade de Lisboa, Avenida da Universidade T\u00e9cnica, 1300-477 Lisbon, Portugal"}]},{"given":"Sofia","family":"Anast\u00e1cio","sequence":"additional","affiliation":[{"name":"Vasco da Gama Research Centre (CIVG), Department of Veterinary Sciences, Vasco da Gama University School, Avenida Jos\u00e9 R. Sousa Fernandes 197 Lordem\u00e3o, 3020-210 Coimbra, Portugal"},{"name":"Centre of Neuroscience and Cell Biology (CNC), University of Coimbra, 3004-531 Coimbra, Portugal"}]},{"given":"Miguel","family":"N\u00f3voa","sequence":"additional","affiliation":[{"name":"Association for the Study and Protection of Donkeys (AEPGA), Largo da Igreja no. 48, 5225-011 Miranda do Douro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0208-3861","authenticated-orcid":false,"given":"Adolfo","family":"Paz-Silva","sequence":"additional","affiliation":[{"name":"Control of Parasites Group (COPAR, GI-2120), Department of Animal Pathology, Veterinary Faculty, University of Santiago de Compostela, 27002 Lugo, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7548-667X","authenticated-orcid":false,"given":"Lu\u00eds Manuel","family":"Madeira de Carvalho","sequence":"additional","affiliation":[{"name":"CIISA\u2014Centro de Investiga\u00e7\u00e3o Interdisciplinar em Sanidade Animal, Faculdade de Medicina Veterin\u00e1ria, Universidade de Lisboa, Avenida da Universidade T\u00e9cnica, 1300-477 Lisbon, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,1,11]]},"reference":[{"key":"ref_1","unstructured":"(2015, November 07). 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