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Attenuation of Eimeria mivati ( = mitis) by selection for precocious development

Published online by Cambridge University Press:  06 April 2009

V. McDonald  and
S. Ballingall
V. McDonald
Affiliation:
Houghton Poultry Research Station, Houghton, Huntingdon, Cambs. PE17 2DA
S. Ballingall
Affiliation:
Houghton Poultry Research Station, Houghton, Huntingdon, Cambs. PE17 2DA
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Summary

By selection for early development of oocysts during serial passage through chickens the pre-patent period of the Houghton (H) strain of Eimeria mivati ( = mitis) was reduced by over 20 h. The precocious parasite is less pathogenic than the H strain and has a reduced reproductive potential. Chicks inoculated with the precocious parasite were protected against challenge with the H strain. The pathogenicity, immunogenicity and reproduction of precocious E. mivati and an attenuated egg-adapted line of E. mivati were compared. Although the precocious parasite produced more oocysts than the egg-adapted parasite in chickens, neither parasite induced loss of weight and both were immunogenic.

Type
Research Article
Information
Parasitology , Volume 86 , Issue 3 , June 1983 , pp. 371 - 379
Copyright
Copyright © Cambridge University Press 1983

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