Body condition score as a selection tool for targeted selective treatment-based nematode control strategies in Merino ewes

M.P. Cornelius; C. Jacobson; R.B. Besier

doi:10.1016/j.vetpar.2014.10.031

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Body condition score as a selection tool for targeted selective treatment-based nematode control strategies in Merino ewes

Journal article

Open access

Peer reviewed

Body condition score as a selection tool for targeted selective treatment-based nematode control strategies in Merino ewes

M.P. Cornelius, C. Jacobson and R.B. Besier

Veterinary Parasitology, Vol.206(3-4), pp.173-181

2014

DOI: https://doi.org/10.1016/j.vetpar.2014.10.031

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Abstract

Sheep nematode control utilising refugia-based strategies have been shown to delay anthelmintic resistance, but the optimal indices to select individuals to be left untreated under extensive sheep grazing conditions are not clear. This experiment tested the hypothesis that high body condition can indicate ability of mature sheep to better cope with worms and therefore remain untreated in a targeted treatment programme. Adult Merino ewes from flocks on two private farms located in south-west Western Australia (Farm A, n = 271, and Farm B, n = 258) were measured for body condition score (BCS), body weight and worm egg counts (WEC) on four occasions between May and December (pre-lambing, lamb marking, lamb weaning and post-weaning). Half of the ewes in each flock received anthelmintic treatments to suppress WEC over the experimental period and half remained untreated (unless critical limits were reached). Response to treatment was analysed in terms of BCS change and percentage live weight change. No effect of high or low initial WEC groups was shown for BCS response, and liveweight responses were inconsistent. A relatively greater BCS response to treatment was observed in ewes in low BCS pre-lambing compared to better-conditioned ewes on one farm where nutrition was sub-optimal and worm burdens were high. Sheep in low body condition pre-lambing were more than three times more likely to fall into a critically low BCS (<2.0) if left untreated. Recommendations can be made to treat ewes in lower BCS and leave a proportion of the higher body condition sheep untreated in a targeted selective treatment programme, to provide a population of non-resistant worms to delay the development of resistance.

Details

Title: Body condition score as a selection tool for targeted selective treatment-based nematode control strategies in Merino ewes
Authors/Creators: M.P. Cornelius (Author/Creator) - Murdoch University
C. Jacobson (Author/Creator) - Murdoch University
R.B. Besier (Author/Creator) - Agriculture and Food
Publication Details: Veterinary Parasitology, Vol.206(3-4), pp.173-181
Publisher: Elsevier BV
Identifiers: 991005544059107891
Copyright: © 2014 Elsevier B.V.
Murdoch Affiliation: School of Veterinary and Life Sciences
Language: English
Resource Type: Journal article

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Citation topics: 1 Clinical & Life Sciences; 1.163 Parasitology - General; 1.163.1022 Anthelmintic Resistance
Web Of Science research areas: Parasitology; Veterinary Sciences
ESI research areas: Plant & Animal Science