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Abstract

This thesis introduces seven published papers and it contains a detailed and critical literature review of the epidemiology of bovine dictyocaulosis. The host-parasite relationship, including a hypothesis on the role of arrested development is discussed and the prevention of parasitic bronchitis by ...

Author(s)
Joergensen, R. J.
Citation
Acta Veterinaria Scandinavica, 1981, Suppl.76, pp 77pp.
Abstract

A field experiment was conducted over two grazing seasons with calves on a permanent pasture in order to follow the pattern of infection with Dictyocaulus viviparus. Infective larvae persisted during the first, but not during the second, winter of observation. By the agar-bile herbage technique, a...

Author(s)
Joergensen, R. J.
Citation
Veterinary Parasitology, 1980, 7, 2, pp 153-167
Abstract

Dictyocaulus viviparus larvae were separated by the bile-agar technique from grass samples taken from a contaminated pasture, were stained with iodine and then examined microscopically. Apart from granules, no internal structures could be seen and the presence and position of the excretory pore and ...

Author(s)
Iskander, A. R.; Joergensen, R. J.
Citation
Acta Veterinaria Scandinavica, 1980, 21, 3, pp 330-335
Abstract

Dictyocaulus viviparus larvae were exposed, at intervals, to ox bile and CO2 during their development to 3rd-stage (infective) larvae. The preinfective larvae were slightly inhibited in that motility was slightly depressed. However, an increased proportion of infective larvae was recovered after...

Author(s)
Joergensen, R. J.
Citation
Experimental Parasitology, 1980, 49, 1, pp 106-115
Abstract

In the west of Scotland the epizootiology of parasitic bronchitis in grazing calves was studied over a 2-year period with the aid of tracer calves and herbage examinations for Dictyocaulus viviparus larvae. The observations of both years emphasized the importance of overwintered lungworm larvae as...

Author(s)
Duncan, J. L.; Armour, J.; Bairden, K.; Urquhart, G. M.; Joergensen, R. J.
Citation
Veterinary Record, 1979, 104, 13, pp 274-278
Abstract

Author(s)
Nansen, P.; Henriksen, S. A.; Schultz, A.; Sejersen, K.; Joergensen, R. J.
Citation
Dansk Veterinaertidsskrift, 1976, 59, 9, pp 397-399
Abstract

Author(s)
Joergensen, R. J.
Citation
Dansk Veterinaertidsskrift, 1976, 59, 9, pp 399
Abstract

Author(s)
Joergensen, R. J.
Citation
Norwegian Journal of Zoology, 1975, 23, 3, pp 195
Abstract

Isolation of infective Dictyocaulus larvae from samples of pasture herbage by a 3-stage procedure is described. The herbage is first washed in water and the larger particles removed by filtering through nylon mesh. Recovery of larvae totally free from the remaining debris is achieved by activating...

Author(s)
Joergensen, R. J.
Citation
Veterinary Parasitology, 1975, 1, 1, pp 61-67

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