Abstract
SYNOPSIS. Eimeria colchici sp. n. is described from English pheasants Phasianus colchicus. It has cocysts measuring 19–33.5 (27.4) by 13–21 (16.7) μ, having both micropyle and polar granule. The large 1st and 2nd generation schizonts occur in the glands of the small intestine, 3rd generation schizonts occur deep in the glands of the ceca, and gametocytes occur in the epithelial cells of the ceca. The prepatent period is 6 days. In young pheasants the parasite causes coccidiosis characterized by formation of white cores in the ceca. Mortality is high in experimental infections. Zoalene (0.0125%) in the feed almost completely suppressed the infection; Amprolium (0.0125%) also gave good control, but sulfaquinoxaline (0.0125%) was not so effective. Sulfaquinoxaline, Saquadil and Sulfamezathine in the drinking water controlled mortality, but treatment had to be applied early to avoid weight losses.
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