Morphometrical analysis of chicken Cryptosporidium baileyi in various stages of life cycle in the bursa of Fabricius were carried out by electron microscope to establish a differential point for identification of C baileyi. By avidin-biotin complex method, protozoans of the bursa of Fabricius were identified Cryptosporidium spp. The size and area on each developmental stages of C baileyi, as measured by Morphomat 10 attached to electron microscope were as follows. Trophozoites´ size with range of 3.21±0.70 × 2.49±0.59㎛, area with range of 118.82±41.92㎛²; meronts´ size 3.99±1.07 × 2.96±0.52㎛, area 210.11±57.ll㎛²; merozoites´ size 1.98±0.43 x 0.60±0.18㎛, area 24.10±5.97㎛²; microgametes´ size 1.36±0.83 x 0.50±0.23㎛, area 20.23±6.73㎛²; macrogametes´ size 4.57±0.65 × 4.02±0.55㎛, area 258.37±51.83㎛²; oocytes´ size 4.39±0.56 × 3.44±0.50㎛, area 187.21±62.68㎛².
In conclusion, the size and area on each developmental stages of Cryptosporidium baileyi is different from that of other Gryptosporidia spp. It suggests, with considering tissue tropism and life cycle, morphometrical analysis can be quite a good way to identify C baileyi.
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