<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Reintroduction of endangered species to natural habitat is considered as an important tool for conservation. The effect of drug management on captive population of reintroduced species is largely neglected. Decreased drug efficacy could pose a substantial threat to health of animals. More importantly, captive population without proper drug administration could act as transmission medium of resistance nematodes to wild population, making it important to delay the occurrence of drug resistance in captive population. Ivermectin have been used in captive Przewalski’s horse (<italic>Equus ferus przewalskii</italic>) to eradicate intestinal parasitic nematodes annually, while no available studies describing the drug efficacy in the recent ten years. Here, fecal egg counts pre- and post-treatment were performed with ivermectin through individual trace. Both large and small strongyles were identifi ed by larval culture. The fecal egg count reduction was almost 100% based on egg counting data of 448 samples from 13 Przewalski’s horses. Feces of two Przewalski’s horses were sampled for successive 20 days. Eggs per gram feces usually increased dramatically at the period of 1 – 2 post-treatment days and declined persistently to 0.0 within 15 days. A sustained high ivermectin efficacy against neither <italic>Parascaris equorum</italic> nor strongyles was indicated, which can be partly explained by the low deworm frequency.</p></abstract>

Reintroduction of endangered species to natural habitat is considered as an important tool for conservation. The effect of drug management on captive population of reintroduced species is largely neglected. Decreased drug efficacy could pose a substantial threat to health of animals. More importantly, captive population without proper drug administration could act as transmission medium of resistance nematodes to wild population, making it important to delay the occurrence of drug resistance in captive population. Ivermectin have been used in captive Przewalski’s horse (Equus ferus przewalskii) to eradicate intestinal parasitic nematodes annually, while no available studies describing the drug efficacy in the recent ten years. Here, fecal egg counts pre- and post-treatment were performed with ivermectin through individual trace. Both large and small strongyles were identifi ed by larval culture. The fecal egg count reduction was almost 100% based on egg counting data of 448 samples from 13 Przewalski’s horses. Feces of two Przewalski’s horses were sampled for successive 20 days. Eggs per gram feces usually increased dramatically at the period of 1 – 2 post-treatment days and declined persistently to 0.0 within 15 days. A sustained high ivermectin efficacy against neither Parascaris equorum nor strongyles was indicated, which can be partly explained by the low deworm frequency.

Drug efficacy of ivermectin against primary nematodes parasitizing captive Przewalski’s horse (<italic>Equus ferus przewalskii</italic>) after ten years of annually treatment

Helminthologia

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Drug efficacy of ivermectin against primary nematodes parasitizing captive Przewalski’s horse () after ten years of annually treatment

Reintroduction of endangered species to natural habitat is considered as an important tool for conservation. The effect of drug management on captive...

Drug efficacy of ivermectin against primary nematodes parasitizing captive Przewalski’s horse (Equus ferus przewalskii) after ten years of annually treatment

Article Category: Research Note

Published Online: Jan 25, 2020

Page range: 57 - 62

Received: Jul 23, 2019

Accepted: Dec 04, 2019

DOI: https://doi.org/10.2478/helm-2020-0004

Keywords
drug efficacy, Captive Przewalski’s horses, fecal egg count reduction test, Ivermectin, parasitic nematodes

© 2020 L. Tang, Y. Xiu, L. Yan, Y. Cui, X. Ma, M. Ente, Y. Zhang, K. Li, D. Zhang, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Drug efficacy of ivermectin against primary nematodes parasitizing captive Przewalski’s horse (Equus ferus przewalskii) after ten years of annually treatment

Article Category: Research Note

Published Online: Jan 25, 2020

Page range: 57 - 62

Received: Jul 23, 2019

Accepted: Dec 04, 2019

DOI: https://doi.org/10.2478/helm-2020-0004

Keywordsdrug efficacy, Captive Przewalski’s horses, fecal egg count reduction test, Ivermectin, parasitic nematodes

© 2020 L. Tang, Y. Xiu, L. Yan, Y. Cui, X. Ma, M. Ente, Y. Zhang, K. Li, D. Zhang, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
drug efficacy, Captive Przewalski’s horses, fecal egg count reduction test, Ivermectin, parasitic nematodes