Survey of anthelmintic resistance in Western Australian sheep flocks 1. Prevalence
- 1 May 1986
- journal article
- research article
- Published by Wiley in Australian Veterinary Journal
- Vol. 63 (5), 135-138
- https://doi.org/10.1111/j.1751-0813.1986.tb02950.x
Abstract
Between July 1981 and December 1983, 116 randomly selected sheep farms in the southwest of Western Australian were surveyed for resistance to anthelmintics. A faecal worm egg count reduction test was carried out on each farm. Anthelmintics tested were thiabendazole (44 mg/kg) and levamisole (7.5 mg/kg) given by the intra-ruminal injection and comparisons were made with an untreated group on each farm. Successful tests were carried out on 84 farms and 68% of these had resistant worms present. The prevalence of thiabendazole resistant populations was for Haemonchus contortus 18%; Teladorsagia, 41% and Trichostrongylus, 48% and for levamisole resistant populations H. contortus, 10%; Teladorsagis, 41%; Trichostronglus, 24%, and Nematodirus, 10%. Multiple resistant populations were found in 17% of farms. Although the distribution of nematode genera varied between the 400 and 750 mm and the greater than 750 mm rainfall zones there was no significant difference in the prevalence of resistance between zones. About one third of resistant population were severly resistant (< 60% reduction). It is likely that resistant worms were present on many farms without causing clinical disease and continued anthelmintic selection pressure will result in further development of resistance.This publication has 12 references indexed in Scilit:
- Anthelmintic resistance in sheepAustralian Veterinary Journal, 1984
- Anthelmintic resistance and sheep management practices in south western VictoriaAustralian Veterinary Journal, 1984
- Oxfendazole resistance inNematodirus spathigerNew Zealand Veterinary Journal, 1983
- A survey of nematode control measures used by sheep farmers and of anthelmintic resistance on their farms Part 2: South Island excluding the Nelson regionNew Zealand Veterinary Journal, 1982
- A survey of nematode control measures used by sheep farmers and of anthelmintic resistance on their farms Part 1. North Island and the Nelson region of South IslandNew Zealand Veterinary Journal, 1981
- THE PROBLEM OF ANTHELMINTIC RESISTANCE IN NEMATODESAustralian Veterinary Journal, 1980
- THE INCIDENCE OF THIABENDAZOLE RESISTANCE IN FIELD POPULATIONS OF HAEMONCHUS CONTORTUS ON THE NORTHERN TABLELANDS OF NEW SOUTH WALESAustralian Veterinary Journal, 1979
- The anthelmintic efficacy of fenbendazole against thiabendazole-resistant strains of Haemonchus conforms and Trichostrongylus colubriformis in sheepResearch in Veterinary Science, 1976
- THE OCCURRENCE OF STRAINS OFHAEMONCHUS CONTORTUSRESISTANT TO THIABENDAZOLEAustralian Veterinary Journal, 1968
- THE ANTHELMINTIC ACTIVITY OF THIABENDAZOLE (M.K.360)Australian Veterinary Journal, 1961