The Reproductive Potential of Five Species of Coccidia of the Chicken as Demonstrated by Oocyst Production

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Abstract
The oocyst production of Eimeria tenella, E. necatrix, E. acervulina E. brunetti, and E. maxima in non-immune chickens was found to vary from sp. to sp., and did not increase proportionately with an increase in the intensity of the initial infection. With light infections E. tenella and E. brunetti yielded about 400,000 oocysts for each oocyst inoculated. The otners were progressively poorer producers in the following descending order: E. acervulina, E. necatrix, and E. maxima. The greatest number of oocysts produced per bird was as follows (in millions of oocysts): E. acervulina, 430; E. tenella, 65; E. brunetti, 55; E. maxima, 36; and E. necatrix, 12.
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