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The development and mortality of the non-infective free-living stages of Ostertagia ostertagi in the field and in laboratory culture

Published online by Cambridge University Press:  06 April 2009

G. Smith ,
B. T. Grenfell  and
R. M. Anderson
G. Smith
Affiliation:
Department of Pure and Applied Biology, Imperial College, London SW7 2BB
B. T. Grenfell
Affiliation:
Department of Pure and Applied Biology, Imperial College, London SW7 2BB
R. M. Anderson
Affiliation:
Department of Pure and Applied Biology, Imperial College, London SW7 2BB
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Summary

A deterministic model of the population biology of the non-infective free-living phase of Ostertagia ostertagi is described and tested. A comparison of field and laboratory studies indicates that the pre-infective larvae of O. ostertagi spend about twice as long in this phase in the field as in laboratory culture (13 days and 7 days respectively at 15 °C), and that the subsequent transition (i.e. second moult) to the infective phase also proceeds at a much slower rate (about 10 times less at 15 °C) in the field. Because of this discrepancy, estimates of model parameters are based entirely on measurements from field studies. A two-parameter model of pre-infective development in the field is derived. It describes egg and larval development as a direct non-linear function of air temperature. We also show that the mortality of the eggs and pre.infective larvae increases with temperature (although this relationship probably also subsumes a dependence on faecal moisture content). The model is shown to be a good mimic of the population dynamics of the non-infective free-living phase when tested against an independent data set, and is the basis of a larger model of the epidemiology of ostertagiasis.

Type
Research Article
Information
Parasitology , Volume 92 , Issue 2 , April 1986 , pp. 471 - 482
Copyright
Copyright © Cambridge University Press 1986

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