Hostname: page-component-77c89778f8-vpsfw Total loading time: 0 Render date: 2024-07-17T11:35:13.507Z Has data issue: false hasContentIssue false
  • English
  • Français

Effects on inhibition of development of the transfer of Ostertagia ostertagi between geographical regions of Australia

Published online by Cambridge University Press:  06 April 2009

M. G. Smeal  and
A. B. Donald
M. G. Smeal
Affiliation:
New South Wales Department of Agriculture, Veterinary Research Station, Glenfield, New South Wales 2167, Australia
A. B. Donald
Affiliation:
CSIRO Division of Animal Health, McMaster Laboratory, Glebe, New South Wales 2037, Australia
Get access Rights & Permissions [Opens in a new window]

Summary

Pasture plots in a warm coastal region were separately contaminated in the autumn, winter and spring with eggs of a coastal strain of Ostertagia ostertagi derived from dairy calves. At the same times, a parallel set of plots was contaminated by a strain transferred from within a beef cattle management system in a cooler tablelands region. A reciprocal transfer of the coastal strain was also made to the tablelands, where pasture plots were contaminated with eggs of both strains of O. ostertagi in winter. Successive groups of parasite-free calves were grazed on the plots for 10–14 days at 4-week intervals and then killed for worm counts 14 days after their removal from pasture. In both environments, irrespective of the season of pasture contamination, inhibition of development reached a maximum in spring and the two strains differed only in the proportion of the population inhibited, which was significantly greater for the table- lands strain. There was no strain difference for either numbers of infective larvae on pasture or total O. ostertagi numbers. This suggested that the difference between coastal and tablelands populations in the extent of inhibition is genetically determined. If an environmental stimulus was implicated in the spring occurrence of inhibition, the stimulus was provided equally in coastal and tablelands environments and it cannot be exposure to low temperatures.

Type
Research Article
Information
Parasitology , Volume 82 , Issue 3 , June 1981 , pp. 389 - 399
Copyright
Copyright © Cambridge University Press 1981

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Anderson, N. (1968). Bovine ostertagiasis of Victorian beef cattle. Victorian Veterinary Proceedings 26, 43–4.Google Scholar
Armour, J. (1970). Bovine ostertagiasis: a review. Veterinary Record 86, 184–90.CrossRefGoogle ScholarPubMed
Armour, J. (1978). Arrested development in cattle nematodes with special reference to Ostertagia ostertagi. In Facts and Reflections III, Workshop on ‘Arrested Development of Nematodes in Sheep and Cattle’ (ed. Borgsteede, F. H. M.). Central Veterinary Institute, Lelystad, The Netherlands.Google Scholar
Armour, J. & Bruce, R. G. (1974). Inhibited development in Ostertagia ostertagi infections – a diapause phenomenon in a nematode. Parasitology 69, 161–74.CrossRefGoogle Scholar
Armour, J., Jennings, F. W. & Urquhart, G. M. (1967). The possible existence of two strains of Ostertagia ostertagi. Veterinary Record 80, 208.Google Scholar
Armour, J., Jennings, F. W. & Urquhart, G. M. (1969). Inhibition of Ostertagia ostertagi at the early fourth larval stage – II. The influence of environment on host or parasite. Research in Veterinary Science 10, 238–44.CrossRefGoogle ScholarPubMed
Duncan, D. B. (1955). Multiple range and multiple F tests. Biometrics, 11, 1–42.CrossRefGoogle Scholar
Michel, J. F. (1978). Topical themes in the study of arrested development. In Facts and Reflections III, Workshop on ‘Arrested Development of Nematodes in Sheep and Cattle’ (ed. Borgsteede, F. H. M.). Central Veterinary Institute, Lelystad, The Netherlands.Google Scholar
Michel, J. F., Lancaster, M. B. & Hong, C. (1974). Studies on arrested development of Ostertagia ostertagi and Cooperia oncophora. Journal of Comparative Pathology 84, 539–54.CrossRefGoogle ScholarPubMed
Michel, J. F., Lancaster, M. B. & Hong, C. (1975). Arrested development of Ostertagia ostertagi and Cooperia oncophora. Effect of temperature at the free-living stage. Journal of Comparative Pathology 85, 133–8.CrossRefGoogle Scholar
Smeal, M. G., Fraser, G. C. & Robinson, G. G. (1980 b). Seasonal changes in the structure of nematode populations of cattle in New South Wales in relation to inhibited larval development. Australian Veterinary Journal 56, 80–6.CrossRefGoogle ScholarPubMed
Smeal, M. G., Hotson, I. K., Mylrea, P. J., Jackson, A. R., Campbell, N. J. & Kirton, H. C. (1977). Studies on nematode infections of beef cattle in New South Wales. Australian Veterinary Journal 53, 566–74.CrossRefGoogle ScholarPubMed
Smeal, M. G., Robinson, G. G. & Fraser, G. C. (1980 a). Seasonal availability of nematode larvae on pastures grazed by cattle in New South Wales. Australian Veterinary Journal 56, 74–9.CrossRefGoogle ScholarPubMed
Sollod, A. E. (1967). The possible existence of two strains of Ostertagia ostertagi. Veterinary Record 81, 547–8.Google Scholar
Williams, E. J. (1959). Regression Analysis. New York: John Wiley.Google Scholar