Multispecific resistance of trichostrongyles to benzimidazoles in a goat herd in Germany
Bauer, C.
Deutsche Tierärztliche Wochenschrift 108(2): 49-50
2001
ISSN/ISBN: 0341-6593 PMID: 11367880 Document Number: 539868
Anthelmintic resistance of nematodes to benzimidazoles and ivermectin was suspected from field observations in an Angora goat herd in northern Hesse. Larvae of the caprine trichostrongyle isolate were used for artificial infections of helminth-naive sheep. Groups of the lambs were treated orally with albendazole (3.8 mg/kg) or s.c. with ivermectin (0.2 mg/kg) four weeks after infection or remained untreated as controls and were necropsied one week later. Albendazole reduced the mean faecal egg counts by 82% and the mean worm counts of Haemonchus contortus by 22%, Ostertagia [Teladorsagia] circumcincta by 10% and Trichostrongylus colubriformis by 41% compared with the controls. Ivermectin was 100% effective. This appear to be the first report from Germany of multi-resistance to benzimidazoles in a trichostrongyle population of goats.