Changes in Fecal Microflora of Rats during Lactation with Special Reference to Enhancement of Escherichia coli Populations

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  • 授乳中の母ラットにおけるふん便細菌叢の変動，特にＥｓｃｈｅｒｉｃｈｉａ　ｃｏｌｉの菌数増加について
  • 授乳中の母ラットにおける糞便細菌叢の変動 : 特にEscherichia coli の菌数増加について
  • ジュニュウチュウ ノ ボ ラット ニ オケル フンベン サイキンソウ ノ ヘン

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Abstract

Female Wistar rats were mated at the age of 8 weeks. Thereafter, the fecal flora was determined in them at intervals of about one week before parturition, during lactation, and after weaning. The large intestinal flora was also examined in infant rats after the second parturition. There was an increase in number of fecal Escherichia coli organisms and enterococci in all the dams and of Proteus mirabilis organisms in some dams during lactation, as compared with any other period. Especially, E. coli showed a remarkable increase in population. These phenomena were shown to be related to the ingestion of infant excrements by the dams. E. coli organisms and enterococci increased moderately in number several days before the second parturition, as compared with those before the first parturition and several days after the first weaning. Anaerobic bacteria, such as anaerobic glam-positive cocci, fusiforms, catenabacteria (composed of eubacteria and anaerobic lactobacilli), clostridia and curved rods, showed somewhat larger populations during lactation than at parturition, but no decrease in population after weaning. On the other hand, bifidobacteria decreased in population at about one week of lactation, as well as after weaning, relating to the age of rats. Staphylococci, lactobacilli, total streptococci, bacteroidaceae and veillonellae showed no special changes during the lactation stage. Changes in the fecal microflora of dams were discussed.

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