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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 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

The epidemiology of gastrointestinal helminth infections in beef cows and calves on pasture was studied in Belgium during the 1990 and 1992 grazing seasons. Weight gain, faecal egg counts, generic differentiation of infective larvae, serum pepsinogen levels, herbage larval counts and worm burdens...

Author(s)
Agneessens, J.; Dorny, P.; Hollanders, W.; Claerebout, E.; Vercruysse, J.
Citation
Veterinary Parasitology, 1997, 69, 1/2, pp 65-75
Abstract

This review briefly summarises different aspects (including development and measurement) and manifestations of protective immunity in cattle against gastrointestinal nematodes, especially Ostertagia ostertagi, and the factors that may interact with the development of this immunity. There follows a...

Author(s)
Vercruysse, J.; Claerebout, E.
Citation
Veterinary Parasitology, 1997, 72, 3/4, pp 309-326
Abstract

The development of immunity to Ostertagia ostertagi and Cooperia oncophora and interactions between these species were investigated in experimentally infected calves. Parasitological, serological and histological parameters were used for assessing immune responses. No conclusive evidence of an...

Author(s)
Dorny, P.; Claerebout, E.; Vercruysse, J.; Hilderson, H.; Huntley, J. F.
Citation
Veterinary Parasitology, 1997, 70, 1/3, pp 143-151
Abstract

Four groups (A-D) of first season grazing calves were turned out onto a heavily infested pasture (Ostertagia ostertagi) for 5 months, and a 5th group (E) was kept as uninfected controls. At housing all group A calves were killed for worm counts. A mean total of 78 915 Ostertagia worms were found,...

Author(s)
Claerebout, E.; Hilderson, H.; Shaw, D. J.; Vercruysse, J.
Citation
Veterinary Parasitology, 1997, 68, 4, pp 337-346
Abstract

The persistence of the efficacy of moxidectin 0.5% pour-on and moxidectin 1% injectable against O. ostertagi and D. viviparus in calves was studied in 2 experimental trials. In the first trial 2 groups of 7 calves were treated with either the pour-on or the injectable formulation, while a third...

Author(s)
Vercruysse, J.; Claerebout, E.; Dorny, P.; Demeulenaere, D.; Deroover, E.
Citation
Veterinary Record, 1997, 140, 3, pp 64-66
Abstract

The responses of peripheral blood and lymph node lymphocytes to O. ostertagi antigen extracts were determined in O. ostertagi-exposed and naive calves. The lymphocyte responses induced by O. ostertagi antigen extracts of the third (L3) and fourth (L4) larval stages, as well as adult worms, were...

Author(s)
Marez, T. de; Cox, E.; Claerebout, E.; Vercruysse, J.; Goddeeris, B. M.
Citation
Veterinary Immunology and Immunopathology, 1997, 57, 1/2, pp 69-77
Abstract

A study was carried out to evaluate the effect of different infection levels of Ostertagia ostertagi and Cooperia oncophora in a simulated 'first grazing season' on the resistance of calves to an artificial challenge infection. The infection levels were determined by the infection schedules and the ...

Author(s)
Claerebout, E.; Vercruysse, J.; Dorny, P.; Demeulenaere, D.; Dereu, A.
Citation
Veterinary Parasitology, 1998, 75, 2/3, pp 153-167

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