Abstract
juvenile and female ducks than in adults and males, respectively, in central Saskatchewan. But, susceptibility may vary for renal and intestinal coccidia. Tyzzeria pellerdyi oocysts obtained from Anas spp. in 1977 were used for cross-transmission studies. Oocysts were embedded in 2.0% agar blocks or suspended in 0.9% NaCl and administered per os to 12 domestic ducklings, A. platyrhynchos domestica, 1 to 2 mo of age. Three uninfected ducklings were kept isolated and served as controls. Feces were collected at 24-hr intervals for 14 days postinfection, but none of the ducks shed oocysts during this time period. This work was supported in part by NIH Grant RR 08012. s, A. platyrhynchos domestica, 1 to 2 mo age. Thr e u infected ducklings were kept
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