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VetMed Resource

Veterinary information to support practice, based on evidence and continuing education

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Abstract

Immunity to O. ostertagi infections in calves develops slowly and only becomes manifest towards the end of a grazing season in which they have been exposed to the parasite. In an attempt to hasten the onset of immune reactions, 3 immunization protocols were set up. 24 heifers were allocated into 4...

Author(s)
Christensen, C. M.; Nansen, P.; Henriksen, S. A.; Monrad, J.; Satrija, F.
Citation
Veterinary Parasitology, 1992, 44, 3/4, pp 247-261
Abstract

This review primarily discusses the status and prospects for control of bovine ostertagiasis in northern Europe, with examples from Denmark, under the headings: prospects for control of ostertagiasis in relation to farming intensity and specialisation; immunity and control (naturally acquired...

Author(s)
Nansen, P.
Citation
Veterinary Parasitology, 1993, 46, 1-4, pp 3-21
Abstract

In an experiment conducted in South East Zealand, Denmark, in the 1991 grazing season, the size and composition of O. ostertagi worm burdens was investigated in tracer calves grazed in early autumn. Two groups of first season cross breed Limousin × Red Danish heifer calves (groups T1 and T2) were...

Author(s)
Satrija, F.; Nansen, P.
Citation
Bulletin of the Scandinavian Society for Parasitology, 1993, 3, 1, pp 20-22
Abstract

A study was undertaken in Denmark to investigate whether experimental, mixed trichostrongyle infections of stabled calves prior to their first grazing season could confer sufficient immunity to significantly reduce egg excretion after turnout, and thereby prevent loss-producing infections later on. ...

Author(s)
Nansen, P.; Stefan, P. E.; Christensen, C. M.; Gasbarre, L. C.; Monrad, J.; Grønvold, J.; Henriksen, S. A.
Citation
International Journal for Parasitology, 1993, 23, 5, pp 627-638
Abstract

Serum anti-Ostertagia ostertagi and anti-Cooperia oncophora antibody responses were assessed in first season and second season calves grazing permanent paddocks. Calves without previous exposure to trichostrongyles were found to mount significant parasite-specific IgG1 antibody responses within two ...

Author(s)
Gasbarre, L. C.; Nansen, P.; Monrad, J.; Gronveld, J.; Steffan, P.; Henriksen, S. A.
Citation
Research in Veterinary Science, 1993, 54, 3, pp 340-344
Abstract

The effects of experimental concurrent infection with O. ostertagi and C. oncophora were compared with the effects of monospecific infections with O. ostertagi under conditions designed to mimic natural conditions on pasture during a grazing season. A significant effect of C. oncophora on the...

Author(s)
Satrija, F.; Nansen, P.
Citation
Research in Veterinary Science, 1993, 55, 1, pp 92-97
Abstract

An attempt was made to control Ostertagia ostertagi by feeding the nematode trapping fungus Duddingtonia flagrans (DSM 6703) to grazing calves. One group of calves (group E) was fed the fungal material in the first 2 months of the grazing season while another group was a non-treated control group...

Author(s)
Wolstrup, J.; Grønvold, J.; Henriksen, S. A.; Nansen, P.; Larsen, M.; Bøgh, H. O.; Ilsøe, B.
Citation
Journal of Helminthology, 1994, 68, 2, pp 175-180
Abstract

A study was conducted in the 1993 grazing season in Denmark with yearling calves exposed to a pasture with a natural mixed trichostrongyle larval infection. It was shown that daily feeding with the microfungus Duddingtonia flagrans during the first 2 months of the season led to a lowered herbage...

Author(s)
Larsen, M.; Nansen, P.; Wolstrup, J.; Grønvold, J.; Henriksen, S. A.; Zorn, A.
Citation
Veterinary Parasitology, 1995, 60, 3/4, pp 321-330
Abstract

Strategic feeding of first-season Friesian heifer calves, each inoculated with 5000 infective larvae of Ostertagia ostertagi, with the microfungus Duddingtonia flagrans (DSM 6703) grown on barley grain at the rate of 200 g dry weight/animal/day, with ∼106 chlamydospores/g, throughout the first 3...

Author(s)
Nansen, P.; Larsen, M.; Grønvold, J.; Wolstrup, J.; Zorn, A.; Henriksen, S. A.
Citation
Parasitology Research, 1995, 81, 5, pp 371-374
Abstract

Matched groups of 8 first-season heifer calves aged between 6 and 8 months were turned out in early May 1992 on a permanent pasture contaminated with trichostrongyles. Groups were grazed separately until they were housed in mid October 1992. Group A remained as untreated controls, group B received...

Author(s)
Satrija, F.; Nansen, P.; Midtgaard, N.; Yang, X.
Citation
Acta Veterinaria Scandinavica, 1995, 36, 3, pp 383-386

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