Worm-control practices and prevalence of anthelmintic resistance using in vivo FECRTs on smallholder sheep farms in Lithuania

This study determined the prevalence of anthelmintic resistance (AR) in parasitic nematodes on smallholder sheep farms in Lithuania from April to November 2014. Faecal samples were collected from two groups of 10-15 sheep treated with fenbendazole (FBZ) or ivermectin (IVM) on 18 sheep farms. Two sam...

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Bibliographic Details
Published in:Helminthologia 2016-03, Vol.53 (1), p.24-30
Main Authors: Kupčinskas, T., Stadalienė, I., Šalomskas, A., Trusevičius, P., Varady, M., Petkevičius, S.
Format: Article
Language:English
Subjects:
Agriculture
Animals
Anthelmintic agents
anthelmintic resistance
Antiparasitic agents
Eggs
Farmers
Farms
FECRT
In vitro methods and tests
In vivo methods and tests
Intestinal parasites
Ivermectin
Lithuania
Livestock farming
Nematodes
Pest resistance
questionnaire survey
Sheep
sheep nematodes
Surveying
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Summary:This study determined the prevalence of anthelmintic resistance (AR) in parasitic nematodes on smallholder sheep farms in Lithuania from April to November 2014. Faecal samples were collected from two groups of 10-15 sheep treated with fenbendazole (FBZ) or ivermectin (IVM) on 18 sheep farms. Two samples were collected from each group: on day zero (T1) and 10-14 days after treatment. Faecal egg counts (eggs per gramme, EPG) were determined using a modified McMaster technique. Animals with < 140 EPG on day zero were removed from the analysis. The prevalence of AR was estimated using the faecal egg count reduction test. AR to FBZ was detected on three of 15 farms where FBZ was used (20 %) and was suspected on one farm (6.7 %). AR to IVM was detected on two of 16 farms where IVM was used (12.5 %). The main species of resistant gastrointestinal nematodes (GINs) identified after treatment were spp. and spp. A questionnaire surveying 71 sheep farmers estimated that 71.8 % of sheep farmers used anthelmintics against GINs. IVM was the most frequently (68.6 %) applied anthelmintic, and 62.7 % of the respondents reported treating their animals twice a year. This study confirmed the presence of AR to GIN infections on sheep farms in Lithuania. Future studies should assess the prevalence of AR to GIN infection using methods.
ISSN:0440-6605
1336-9083
DOI:10.1515/helmin-2015-0064