Pesqui Vet Bras ; 33 Resistance of gastrointestinal nematodes to anthelmintics in sheep. These studies have involved mainly the fecal egg count reduction test FECRT and its correlation with field management practices. Resistance to benzimidazole anthelmintics in small strongyles Cyathostominae of horses in Denmark. Keeping in mind that new classes of anthelmintic drugs with different mode of action have not been introduced since the 80s and that the AR problem seems to escalate worldwide, we have to take action.

Decreased ivermectin and moxidectin sensitivity in Haemonchus contortus selected with moxidectin over 14 generations. In sheep, oxfendazole was studied separately by Melo et al. Anthelmintic resistance detection methods. Challenges of nematode control in ruminants: HaemonchusCienc Rural ; 34 3: Modification of the original method is developed by Taylor et al. The nematode strains resistant to benzimidazole were highly susceptible to imidazothiazoles, but in Australia, Le Jambre et al.

Cienc Rural ; 33 2: In that study, the prevalence of resistant nematodes involved Haemonchus in sheep and goats, followed by Strongyloides, Trichostrongylus and Oesophagostomum. Investigation of the persistence of levamisole and oxyclozanide in milk and fate in cheese.

Anthelmintic resistance. An overview of the situation in the Nordic countries

In this state, Sczesny-Moraes et al. A molecular tool for species identification and benzimidazole resistance diagnosis in larval communities of small ruminant parasites.


Methods to determine resistance to anthelmintics when continuing larval development occurs. Haemonchus contortusAust Vet J ; 57 2: A multiple-resistant Brazilian isolate and the costs for its characterization and maintenance for research use.

Overview of anthelmintic resistance of gastrointestinal nematodes of small ruminants in Brazil

Host-specificity and morphometrics of female and Nematoda: Resistance to benzimidazole resistance in field strains of Resistabce and Nematodirus in sheep. Cienc Rural ; 30 5: Surveillance ; 11 4: Reducing the development of AR AR is a major problem when controlling parasite infections in production animals and horses worldwide. Further potential limitations of the dissertafion faecal egg count reduction test for the detection of anthelmintic resistance in sheep.

Semin Cienc Agrar ; 19 1: Arq Bras Med Vet Zootec ; 52 5: On 16 sheep farms.

AHR problems were reported in a broad study by Ramos et al. How to cite this article. Ostertagia circumcinctaPrev Vet Med ; 63 N Z Vet J ; 45 6: First report of monepantel resistance on sheep farms in Uruguay.

anthelmintic resistance dissertation

J Am Vet Med Assoc. At present, resistant nematode populations are detected in all our naturally grazing species; sheep, goats, cattle and horses [ 1 ]. Vet Parasitol b; Onderspoort J Vet Res. Impact of drug treatments on parasite P-glycoprotein expression. Update of the situation in the American continent. Decreased ivermectin and moxidectin sensitivity in Haemonchus contortus selected with moxidectin over 14 generations.


In the Nordic countries parasites which do not overwinter on the pasture, such as H. In pigs, resistance to pyrantel, levamisole and benzimidazoles in Oesophagostumum spp have been detected [ 45 ].

anthelmintic resistance dissertation

In this region, due to the size of the herds, there are important research centers in small ruminants that significantly contribute to the national survey. Support Center Support Center. Anthelmintic resistance in sheep flocks in Ontario, Canada.

anthelmintic resistance dissertation

For decades use of anthelmintics has been central in the control programs of these parasites.