Abstract
In ducks experimentally infected with coccidia, schizonts were observed 36 hours after infection. They were elliptic in shape and seemed to have nearly been completed.
Two morphologically different types of merozoites appeared 60 hours after infection. One type was large and arcuate and the other small and rod-shaped. The large and small merozoites were originated from the elliptic and radial schizonts, respectively.
A new type of schizonts was observed 60 hours after infection, showing that schizogony took place for two generations. Further investigation is required to clarify the significance of the two types of merozoites and the new type of schizonts in the life-cycle of coccidia in ducks.
