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Funding for this project was provided by the RTA2013-00064-C02-01 grant from the National Institute for Agricultural and Food Research and Technology (INIA). Special thanks go to J.A. Tanco and A. Guillen for their assistance in field and laboratory work and to Carmen Margolles for her support. Thanks go also to the two anonymous reviewers for their valuable comments.

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Assessment of targeted selective treatment criteria to control subclinical gastrointestinal nematode infections on sheep farms

Publicado en:Veterinary Parasitology. 277 (UNSP 109018): 109018-109018 - 2020-01-01 277(UNSP 109018), doi: 10.1016/j.vetpar.2019.109018

Calvete C; Delgado I; Uriarte J;

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Resúmen: Control of sheep gastrointestinal nematode (GIN) infections mostly relies on the use of anthelmintics. Refugia-based control strategies as targeted selective treatments (TST) can delay anthelmintic resistance development, but the optimal decision criteria for selecting individuals to be treated in subclinical infection scenarios remain unclear. The present study aimed to evaluate the suitability of body condition score (BCS) and faecal egg counts (FEC) as treatment indicators and to determine their optimized threshold values for treatment in TST by determining the relationships of BCS, FEC and anthelmintic treatment with several productive parameters in pre-mating and pre-partum periods at an individual level. Deworming in pre-mating period increased BCS gain, but its magnitude was directly associated with strongyle FEC before treatment. Deworming also increased fertility in ewes with BCS??400 epg before treatment. These results showed that FEC and especially BCS can be potential decision criteria for the implementation of TST in these types of scenarios. The TST scheme derived from the present results on the control of GIN infections should include anthelmintic treatment of ewes with BCS lower than ? 3 approximately five weeks before mating and lambing. In the pre-lambing period, treatment may be unnecessary if flock mean strongyle FEC is lower than ? 200 epg, as the proportion of ewes with individual FEC?>?400 epg would be very low. The results suggest that implementation of this TST scheme would provide benefits, such as the improvement of productivity, a rational management of parasites in refugia, and preservation of future efficacy of anthelmintics, in comparison to traditional deworming schemes.Copyright © 2019 Elsevier B.V. All rights reserved.

Palabras clave: Body condition score; Breeding performance; Efficacy; Ewes; Growth; Management; Parasitic infections; Productive efficiency; Regimes; Resistance; Small ruminants; Strategic anthelmintic treatment; Subclinical gastrointestinal nematodosis; Targeted selective treatments

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