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Model predictions for anthelmintic resistance amongst Haemonchus contortus populations in southern Brazil

Echevarria, F.A.M. and Gettinby, G. and Hazelwood, S. (1993) Model predictions for anthelmintic resistance amongst Haemonchus contortus populations in southern Brazil. Veterinary Parasitology, 47 (3-4). pp. 315-325. ISSN 0304-4017

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Abstract

A computer model developed to study Ostertagia circumcincta resistance to anthelmintics in UK sheep flocks has been adapted for use with Haemonchus contortus under southern Brazilian conditions. The model simulates the effect of different anthelmintic control regimens on the year-to-year pattern of resistance in breeding ewes. The nematode control regimen most used by Brazilian sheep farmers was found to increase the frequency of genes which confer resistance from approximately 3% to 14% in an H. contortus population over a 20 year period. The effect of early versus late season anthelmintic treatment was investigated. This indicated that early season treatment would select for resistance rapidly, whereas late season treatments would not, owing to large numbers of untreated parasites accumulating at the beginning of the season. A model which can predict the development of anthelmintic resistance in parasites of ewes is a valuable tool in the understanding of the effect of different strategies on nematode control programmes and merits further consideration.

Item type: Article
ID code: 17708
Notes: I have added a scanned copy of the document
Keywords: anthelmintic resistance, Brazil, computer simulation, gene frequency, sheep, sheep diseases, Haemonchiasis, Haemonchus contortus, drug resistance, Probabilities. Mathematical statistics, Genetics, veterinary(all), Parasitology
Subjects: Science > Mathematics > Probabilities. Mathematical statistics
Science > Natural history > Genetics
Department: Faculty of Science > Mathematics and Statistics
Depositing user: Strathprints Administrator
Date Deposited: 13 May 2010 18:20
Last modified: 17 Jun 2015 17:24
Related URLs:
URI: http://strathprints.strath.ac.uk/id/eprint/17708

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