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The bionomics of the free-living larvae and the transmission of Dictyocaulus filaria between lambs in North-East England

Published online by Cambridge University Press:  05 June 2009

G. J. Gallie  and
V. J. Nunns
G. J. Gallie
Affiliation:
School of Agriculture, The University, Newcastle-upon-Tyne, England
V. J. Nunns
Affiliation:
School of Agriculture, The University, Newcastle-upon-Tyne, England
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Abstract

The bionomics of the free-living larvae of Dictyocaulus filaria on pasture, and the transmission of infection between lambs, were studied during different seasons of the year m North-East England.

The rate of development of first-stage larvae to the third stage took 4–9 days in late spring and summer, 1½–4 weeks in autumn and 5½–7 weeks in winter. The proportion of first-stage larvae developing to the third stage ranged from 10–28% in autumn and winter, and 2–25% in spring and summer. The rate of mortality of the third-stage larvae was approximately logarithmic in nature, although the survival time was shorter in spring and summer than in autumn and winter. Third-stage larvae were able to survive from autumn until the spring of the following year in sufficient numbers to perpetuate transmission but not to cause clinical disease.

Type
Research Article
Information
Journal of Helminthology , Volume 50 , Issue 2 , June 1976 , pp. 79 - 89
Copyright
Copyright © Cambridge University Press 1976

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References

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