豚の消化管内細菌叢に関する研究 : II. 抗生物質投与の影響について

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In their previous investigation, the authors studied the normal bacterial flora of therectal feces in the healthy pig, and particularly clarified changes in the species and numbersof organisms appearing in the rectal feces with the advance in growth of the pig. Ill thepresent investigation, experiments were carried out to determine what changes would occurin the normal bacterial flora of the rectal feces and contents of intestinal tract of the pigwhen large doses of various antibiotics were aclrrninistered to this animal.The results obtained are summarized as follows.1. No remarkable changes occurred in the normal bacterial flora after the administ-ration of a single dose of any antibiotic. Only Escherichia coli and Lactobacillus organismsshowed a decrease in number for several days after the single administration. Accordingly,it was made clear that the composition of tlte normal bacterial flora was of rather solidstability.2. It was extremely difficult to remove all Line bacteria from the bacterial flora ofthe rectal feces even by means of the consecutive administration of large doses of antibiotics.Such type of administration finally allowed Streptococcus exclusively to multiply in therectal feces.3. Characteristic changes were observed in the bacterial flora of each portion of thedigestive tract in a pig administered consecutively with large doses of antibiotics. Whenthe relationship between the section of the alimentary canal and the number of microbialspecies isolated was examined>the section covering tlre duodenum through the cecum wasfound harboring Yeasts at 5 to 8, as expressed by Log count per gram of sample, and theduodenum and ileum eontained Bifidobacterium at 4.5 and 8, respectively. The value ofStreptococcus detected was 10 in the rectum and decreased gradually as the intestinalcanal was followed upward, reaching 5 in the duodenum.4. It is very diflicult to detect any abnormality on the part of the animal body byexamining the bacterial flora of the rectal feces alone. In order to attain these p
社団法人日本獣医学会の論文
1965-12-25

豚の消化管内細菌叢に関する研究 : II. 抗生物質投与の影響について

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