title: Studies on multispecific resistance of gastrointestinal nematodes to benzimidazoles on dairy-goat farms.
abstract: Multispecific resistance to benzimidazoles was studied in three selected farms. These farms had bred dairy goats for more than 15 years. The helminths were introduced with the goats at the establishment of the farms which afterwards remained isolated. Nematode resistance could then be related to their own management practices. Faecal egg count tests and egg hatch assays were performed to assess intensity of resistance. The generic (infective larvae in faecal cultures) and specific richness (adult worms) were assessed. The resistant species were Trichostrongylus colubriformis, Teladorsagia circumcincta, Haemonchus contortus and Oesophagostomum venulosum. Faecal egg count reduction tests and egg-hatch assays did not match exactly. Faecal larval counts after treatments gave a distorted picture of multispecific resistance: Haemonchus and Oesophagostomum were very largely over represented. The number of species found in the three farms was relatively low compared with other reports in goat farms of the area. This reduction of diversity might also be due in part to characteristics of breeding management and history (use of permanent pasture and introduction of goats at the establishment of farm).
authors: INRA, Station de Pathologie aviaire et de Parasitologie, Nouzilly, France.
authors: J
authors: J
authors: Cabaret
authors: H M
authors: HM
authors: Baudet
authors: J
authors: J
authors: Devos
authors: J
authors: J
authors: Hubert
authors: J
authors: J
authors: Cortet
authors: C
authors: C
authors: Sauvé
mesh_terms: D000822:Animal Husbandry; D000818:Animals; D000969:Antinematodal Agents / Q000627:therapeutic use / Q000633:toxicity*; D001562:Benzimidazoles / Q000627:therapeutic use / Q000633:toxicity*; D018432:Drug Resistance, Multiple; D005260:Female; D005767:Gastrointestinal Diseases / Q000188:drug therapy / Q000662:veterinary*; D015511:Goat Diseases; D006041:Goats; D006373:Helminthiasis / Q000517:prevention & control; D006374:Helminthiasis, Animal; D007814:Larva; D015999:Multivariate Analysis; D009348:Nematoda / Q000187:drug effects*; D010270:Parasite Egg Count; D013045:Species Specificity
chemical_list: D000969:Antinematodal Agents; D001562:Benzimidazoles