To evaluate the effects of Kluyveromyces marxianus M3, with good fermentation performance and high ability to produce bile salt hydrolase, isolated from Tibetan kefir on the intestinal flora balance in experimental hypercholesterolemic rats, 40 rats(43 weeks old) were divided into 4 groups and fed a high fat diet supplemented with low, medium and high dose of freeze-dried K. marxianus M3 powder for a 7-week experimental period. According to our results, in the first five weeks, the numbers of 3 kinds of bac...