Targeted selective deworming of Dorper sheep in a farm from the central zone of Tamaulipas, Mexico
DOI:
https://doi.org/10.29059/cvpa.v1i1.8Keywords:
anthelmintic resistance, nematode, targeted selective dewormingAbstract
Recent studies showed that targeted selective treatment (TST) allows reducing the frequency of animals treated with anthelmintics (AH) in sheep flocks. It is currently unknown if the TST can be used with Dorper ewes, a breed that is known to be susceptible to gastrointestinal nematodes (GIN). This study evaluated a TST scheme in sheep farm in the central zone of Tamaulipas. The first thing was to determine which AH could be used for the TST. Thus, an AH resistance diagnosis was implemented for the three classes of broad-spectrum AH (levamisole, fenbendazole and ivermectin) and the combination of levamisole and fenbendazole using respective faecal egg-count reduction tests. Subsequently, a monthly TST scheme was established during 6 months, in a population of 74 to 98 adult ewes. Each ewe was checked every month for its FAMACHA© and body condition score (BCS) and a faecal sample was obtained from all animals with poor BCS (<2) or pale mucosae (FAMACHA© >3). Faecal samples were processed by means of the McMaster technique and those animals with GIN faecal egg counts ≥ 750 eggs per gramme of faeces (EPG) were dewormed. The farm had a multi-resistant GIN population, with resistance to the three classes of AH, but the levamisole-fenbendazole combination showed to be 100% effective against GIN, thus the combination was used in the study. The implementation of the TST reduced the use of AH, going from 100% of ewes treated every six months, to only between 33.63% and 1.35% animals in each month. The use of ≥ 750 EPG as a threhold for AH treatment allowed to main-tain almost 75% of thin or pale animals without an AH treatment. In conclusion, the TST scheme allowed to reduce the use of AH in a flock of Droper ewes under the conditions of Tamaulipas, Mexico.
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