2〜5種類の細菌を混合して定着させたgnotobioteマウスにおけるたん白質ならびに脂肪の消化および窒素蓄積について (Germfree,gnotobiotesおよびconventionalマウスにおける飼料の消化・吸収ならびに窒素蓄積に及ぼす消化管内微生物の影響-2,3-〔英文〕)

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Five kinds of bacteria i.e. Bacteroides sp., Escherichia coli, Lactobacillus sp., Staphylococcus epidermidis and Streptococcus faecalis were administered (polycon-tamination: PC) in combinations in mixtures of two, three, four and five kinds for establishment in the intestinal tracts of 8-week-old germfree (GF) mice. The effects of these combinations of bacteria on digestion and absorption of nutrients in diet and nitrogen (N) retention were investigated by comparison before and after contamination in the same mice. The animals were both sexes of the ICR strain of GF mice reared in metabolism cage (5 mice per cage) for four weeks from 7 to 11 weeks of age. The results can be summarized as follows; 1) Body weight, food intake and fresh feces excretion increased slightly for all combinations of bacteria, but among the combinations of bacteria no significant difference were found. 2) Viable counts of fecal bacteria two weeks after PC were <103 of Staphylococcus when coexisted with the other four kinds of bacteria, but remained constant in all other cases. 3) The apparent digestibility of crude and true protein in general slightly decreased by PC, but in a few cases where Staphylococcus was present, there was a slight increase. 4) The apparent digestibility of crude fat generally slightly decreased by PC. 5) The tendency showed increasing N retention when Staphylococcus epidermidis was present and sufficiently established in the digestive tract of the PC mice, in most combinations.
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