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Abstract

Ostertagia ostertagi adult worm extracts were analysed by Western blotting using sera from calves experimentally infected with O. ostertagi and Cooperia oncophora. Strong differences in antigen recognition were noticed, even between animals from the same group. Two Ostertagia specific antigens with ...

Author(s)
Graaf, D. C. de; Berghen, P.; Hilderson, H.; Claerebout, E.; Vercruysse, J.
Citation
International Journal for Parasitology, 1994, 24, 5, pp 681-688
Abstract

The inverse relationship between the intensive use of modern anthelmintics and the build up of immunity to gastrointestinal nematodes in cattle is discussed. Manifestations of immunity, humoral reactions, cell-mediated reactions, control, and chemoprophylaxis and immunity are discussed. It is...

Author(s)
Vercruysse, J.; Hilderson, H.; Claerebout, E.
Citation
Parasitology Today, 1994, 10, 4, pp 129-132
Abstract

Two farms had a low prevalence of gastro-intestinal parasites (dominated by Cooperia and Ostertagia), but there was still a difference in faecal egg counts and serum pepsinogen between 23 calves given a fenbendazole bolus at the start of grazing (at 7-8 months of age) and 23 untreated calves.

Author(s)
Berghen, P.; Hilderson, H.; Vercruysse, J.; Claerebout, E.; Dorny, P.
Citation
Veterinary Quarterly, 1994, 16, 3, pp 161-164
Abstract

The effect of an ivermectin sustained-release bolus (I-SRB) on the epidemiology of nematode parasites and on calf productivity was evaluated in a field trial under Northwestern European conditions. 20 parasite-naive female Friesian calves (principals) aged 5-9 months were used together with 6 male...

Author(s)
Claerebout, E.; Hollanders, W.; Cock, H. de; Vercruysse, J.; Hilderson, H.
Citation
Journal of Veterinary Pharmacology and Therapeutics, 1994, 17, 3, pp 232-236
Abstract

Development of immunity to Ostertagia ostertagi and Cooperia oncophora and interactions between both species in primed calves were investigated after homologous, heterologous and concurrent challenge infections. Worm counts, faecal egg output, IgG1 and IgG2 antibodies and the presence of globule...

Author(s)
Hilderson, H.; Vercruysse, J.; Claerebout, E.; Graaf, D. C. de; Fransen, J.; Berghen, P.
Citation
Veterinary Parasitology, 1995, 56, 1/3, pp 107-119
Abstract

Excretory-secretory and somatic antigens of Ostertagia ostertagi fourth stage larvae, emulsified with complete Freund's adjuvant, were ip administered to calves on 3 occasions. Two weeks after the last immunisation all calves were infected with a single dose of 130 000 O. ostertagi 3rd stage...

Author(s)
Hilderson, H.; Berghen, P.; Graaf, D. C. de; Claerebout, E.; Vercruysse, J.
Citation
International Journal for Parasitology, 1995, 25, 6, pp 757-760
Abstract

The efficacy of two strategic treatments with doramectin (sc 200 µg/kg bodyweight) was studied in 20 first-season Holstein crossbred calves. The calves were allocated to two equal groups: Group D was treated with doramectin at turn-out and 8 weeks later and Group C served as control group. Tracers...

Author(s)
Vercruysse, J.; Hilderson, H.; Claerebout, E.; Roelants, B.
Citation
Veterinary Parasitology, 1995, 58, 1/2, pp 27-34
Abstract

The influence of prophylaxis on the immune response to gastrointestinal nematodes was evaluated in 3 groups of 10 first-season grazing calves. Group C functioned as untreated controls, whereas Group L received 2 treatments, one at turn-out and one 8 weeks later, with doramectin (200 µg/kg) and...

Author(s)
Vercruysse, J.; Hilderson, H.; Claerebout, E.
Citation
Veterinary Parasitology, 1995, 58, 1/2, pp 35-48
Abstract

The relative contribution of the 3rd (L3), 4th (L4) and adult stages of O. ostertagi to the development of immunity was assessed in calves which were either continuously infected during 21 weeks or subjected to infections truncated by anthelmintic treatment at the L3 or L4 stage. A 4th group...

Author(s)
Claerebout, E.; Hilderson, H.; Meeus, P.; Marez, T. de; Behnke, J.; Huntley, J.; Vercruysse, J.
Citation
Veterinary Parasitology, 1996, 66, 3/4, pp 225-239
Abstract

A single treatment with doramectin (200 mg/kg s.c.) given at turnout was compared with a proven programme of 2 pour-on treatments with ivermectin (500 mg/kg) given at turnout and 6 weeks later in groups of 15 Holstein cross Friesian calves (10-12 months old). For a short grazing season of 126 days, ...

Author(s)
Vercruysse, J.; Claerebout, E.; Dereu, A.; Lonneux, J. F.
Citation
Veterinary Record, 1996, 139, 22, pp 547-548

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