Abstract
The aim of this study was to evaluate whether a normal yeast flora is present in the intestine of healthy foals and whether establishing yeast flora or yeast overgrowth might be associated with foal-heat diarrhea. Among the sampled foals, 49% showed foal-heat diarrhea and 28.3% were positive for yeasts. Candida famata was isolated 9 times; Geotrichum sp., 6; Saccharomyces cerevisiae, 5; Cryptococcus laurentii, 4; Rhodotorula sp., 3; Zygosaccharomyces sp., 2; and Candida colliculosa, Candida globosa, and Candida pelliculosa 1 time, respectively. The colony-forming unit ranged from 1 to 10 in all positive cultures. Fifteen of 92 (16.3%) foals with heat diarrhea and 11 of 92 (11.9%) asymptomatic animals yielded positive samples for yeasts. None of the animals shed the same yeast more than 2 times consecutively, and yeasts were found in pure or mixed culture. Equine gastrointestinal tract did not appear to be colonized by yeasts during the first 15 days of life, and yeasts are not involved in foal-heat diarrhea.
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