Comparative Studies on the Intestinal Ciliate Fauna Excreted in the Feces of Yearlings, Bloodmares, Riding Horses and Racehorses

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The ciliate fauna in feces was surveyed in 146 light horses (25 yearlings, 60 racehorses, 45 bloodmares, and 16 riding horses). The results obtained are as follows. (1) It was possible to identify 7 classes of ciliate protozoa, including 53 species belonging to 23 genera in light horses, 49 species to 23 genera in yearlings, 49 species to 22 genera in racehorse, 50 species to 22 genera in bloodmares and 45 species to 20 genera in riding horses. Of all the species, three had never been recorded before in Japan. (2) The average density of ciliates was 4.32×104/ml in yearlings, 9.03×104/ml in racehorses, 3.14×104/ml in bloodmares, and 2.89×104/ml in riding horses. So it was significantly higher in the racehorses than in any other horses. (3) The averagenumber of ciliate species harbored was 18.4 in yearlings, 21.0 in racehorses, 16.9 in bloodmares, and 16.6 in riding horses. It was significantly higher in the racehorses than in any other horses. (4) In the ciliate fauna in the feces of each group of horses, the incidence of each genus or species and the density of ciliates correlated significantly to each other. When ciliates were present at a high density, they tended to be distributed extensively.
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