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Abstract

The epidemiology of Ostertagia ostertagi infection in cattle from Maine, USA, is discussed. Clinical ostertagiasis is seen mainly in calves and yearlings but outbreaks tend to be sporadic; the subclinical disease is of greater importance. Studies on the population dynamics of the free-living stages ...

Author(s)
Gibbs, H. C.
Citation
Veterinary Parasitology, 1988, 27, 1, pp 39-47
Abstract

The control of O. ostertagi infections in Australia is aimed specifically at young cattle in their first and 2nd year of grazing after weaning. Mature breeding stock are not routinely treated. The recommended strategy is preventive, using an integrated approach of timed anthelmintic treatments in...

Author(s)
Anderson, N.
Citation
Veterinary Parasitology, 1988, 27, 1, pp 49-57
Abstract

The epidemiology, pathology, chemotherapy and control of Ostertagia ostertagi in cattle from southern Brazil, Uruguay and central Argentina and Chile are briefly discussed. Outbreaks of Type I ostertagiasis usually occur after weaning (autumn-winter) when larval counts are high and food...

Author(s)
Entrocasso, C. M.
Citation
Veterinary Parasitology, 1988, 27, 1, pp 59-65
Abstract

Benzimidazole- and levamisole-resistant Ostertagia circumcincta from sheep have been reported from several countries, but there are no reports of anthelmintic-resistant O. ostertagi in cattle, although resistance has been confirmed in controlled trials. Reasons for this may include the biology of...

Author(s)
Coles, G. C.
Citation
Veterinary Parasitology, 1988, 27, 1, pp 89-96
Abstract

Control of helminthiasis by ruminal anthelmintic bolus is shown to be better than a single mid-season dosing. Pasture was divided into 2 contiguous lots of equal size to accommodate 18 8-month-old Holstein heifers randomly divided into 9 controls and 9 bolus-treated animals (22.05 g of levamisole...

Author(s)
Moulin, C.; Garnier, C.; Mage, C.; Ascher, F.; Maynard, L.
Citation
Recueil de Médecine Vétérinaire, 1988, 164, 1, pp 45-50
Abstract

The course of serum pepsinogen concentration was studied in 6 calves infected experimentally with Ostertagia, and in 43 calves on 4 premises, exposed to infested pasture. Serum pepsinogen was also measured in 44 cows, 15 of which had positive faecal egg counts for Ostertagia. It was confirmed that...

Author(s)
Berghen, P.; Dorny, P.; Vercruysse, J.; Hilderson, H. M.
Citation
Vlaams Diergeneeskundig Tijdschrift, 1988, 57, 3, pp 157-173
Abstract

The most important gastro-intestinal parasites of Charolais cattle are Ostertagia; Trichostrongylus and Cooperia are considered secondary. Dictyocaulus is the most common respiratory parasite, especially in young Charolais cattle. Fasciola and coccidia also occur. Fascioliasis gives rise to...

Author(s)
Mage, C.; Bernard, Y.
Citation
Recueil de Médecine Vétérinaire, 1988, 164, 6-7, pp 539-548
Abstract

Four groups, each of six male Friesian calves, grazed separate 0.66 hectare paddocks from May 7 until October 23, 1986. Each of the animals in groups 1 and 4 was dosed with an oxfendazole pulse release bolus at turn-out, whereas the animals in groups 2 and 3 were left untreated. Parasite-free naive ...

Author(s)
Armour, J.; Bairden, K.; Oakley, G. A.; Rowlands, D. ap T.
Citation
Veterinary Record, 1988, 123, 18, pp 460-464
Abstract

On pasture grazed by young cattle over several years, three drenches with 7.5 mg fenbendazole, 2 weeks apart, between mid-August and mid-September, prevented clinically overt disease and reduced pepsinogen values and faecal trichostrongyle egg counts.

Author(s)
Nansen, P.; Jørgensen, R. J.; Henriksen, S. A.; Foldager, J.
Citation
Acta Veterinaria Scandinavica, 1988, 29, 1, pp 85-90
Abstract

Calves infected orally with third stage larvae of Ostertagia ostertagi or infected with adult O. ostertagi by direct transplantation into the abomasum had raised plasma pepsinogen activity, as did four-year-old dairy cattle challenged with O. ostertagi third stage larvae on five occasions. Using...

Author(s)
McKellar, Q. A.; Eckersall, P. D.; Duncan, J. L.; Armour, J.
Citation
Research in Veterinary Science, 1988, 44, 1, pp 29-32

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