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The appearance of bisporocystic oocysts of Eimeria maxima in drug-treated chicks

Published online by Cambridge University Press:  06 April 2009

C. C. Norton  and
L. P. Joyner
C. C. Norton
Affiliation:
Central Veterinary Laboratory, MAFF, New Haw, Weybridge, Surrey
L. P. Joyner
Affiliation:
Central Veterinary Laboratory, MAFF, New Haw, Weybridge, Surrey
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Summary

A line of Eimeria maxima acquired resistance to Lerbek (a mixture of clopidol and methyl benzoquate) after serial passage against rising drug levels. Abnormal bisporocystic oocysts which appeared throughout this series were picked out individually and these produced infections in further groups of chicks. Serial passages of selected bisporocystic forms raised their proportion in oocyst yields to about 80% after 10–14 passages, but a few normal oocysts were still present.

Type
Research Article
Information
Parasitology , Volume 77 , Issue 3 , December 1978 , pp. 243 - 248
Copyright
Copyright © Cambridge University Press 1978

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References

REFERENCES

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