牛精液の細菌汚染防止に関する研究III.希釈保存精液由来の酵母様真菌について

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  • Studies on the prevention of bacterial contamination of bull semen. III. Yeasts recovered from diluted bull semen treated with antibiotics

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In the present study, isolation of yeasts from diluted bull semen treated with antibiotics and identification and classification of the yeasts were performed. Procedures of identification of yeasts were shown in Table 1. Classification of the yeasts was carried out by the method of Lodder et al. (1952). In addition, 2 cases of bovine endometritis caused by Candida infection were described. <BR>1) A total of 154 strains of yeasts was isolated from 106 of 498 diluted bull semen samples (21. 3%). The recovery rate tended to increased year by year (table 2). <BR>2) The yeasts isolated from the semen were classified into 2 families, 7 genera and 22 species, the main species being Candida guilliermondii, C. parapsilosis, C. tropicalis, Torulopsis famata and Rhodotorula minuta as shown in Table 3. According to Lodder et al., these species of yeasts seemed to be those existing commonly in the soil, feed and alimentaly canal of domestic animals, and some of them might have potential pathogenicity. It was supposed that the yeasts in the semen were derived primarily from the preputial cavity. <BR>3) Yeasts were isolated from 2 cases of chronic endometritis which had not been recovered by successive intrauterine injections with sulfanamide drugs and antibiotics. The yeasts were identified as C. guilliermondii. Although it could not be known whether the 2 cases were caused by primary infec-tion with C. guilliermodii or by secondary infection as substitutive microbism due to successive treatments with antibiotics, Candida organisms seemed to be causative of sterility in cattle.

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