Effect of the two-year milk-feeding on the gastrointestinal microflora of the cynomolgus monkey (Macaca fascicularis).

The effect of the two-year milk-feeding on the gastrointestinal (GI) microflora of a cynomolgus monkey was determined. Bifidobacterium spp. in the animal fed with cow's milk alone were distributed in higher number in the stomach, duodenum, cecum, and rectum. The increasingly higher numbers of Lactobacillus spp. and Candida spp. were counted in all regions of the GI tract of the animal fed with the formula diet. Bacteroidaceae, Enterobacteriaceae, and Streptococcus spp. were detected from the upper to lower intestines in the monkey given only milk, whereas in the monkey given the formula, those bacterial species were localized in only the lower intestines.