Data/hora: 24/06/2024 00:35:26

Biblioteca(s): | Embrapa Pecuária Sul.
Data corrente: | 05/09/2018
Data da última atualização: | 05/09/2018
Autoria: | ECHEVARRIA, F. A. M.; GETTINBY, G.; HAZELWOOD, S.
Afiliação: | FLAVIO AUGUSTO MENEZES ECHEVARRIA, CPPSUL; G. Gettinby, University of Strathclyde; S. Hazelwood, University of Glasgow.
Título: | Model predictions for anthelmintic resistance amongst Haemonchus contortus populations in southern Brazil.
Ano de publicação: | 1993
Fonte/Imprenta: | Veterinary Parasitology, v. 47, n. 3-4, p. 315-325, May 1993.
Idioma: | Inglês
Conteúdo: | 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.
Thesagro: | Nematóide; Parasito de Animal; Parasitose.
Categoria do assunto: | --
Registro original: | Embrapa Pecuária Sul (CPPSUL)
Exemplares: | CPPSUL - (14368-1) - UPC - AP - DD -  -  -  - DIS