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Abstract
The effect of three antibiotics Kanamycin, Penicillin and Colistin, at doses from 0,125 to 2,50 mg/ml; 50 to 1.000 U.I./ml; 500 to 7.500 U. I./ml, respectively on the production of volatile fatty acids, has been studied according to the Tilley and Terry's method "in vitro", with a substract of starch, cellulose and urea (47,5, 47,5 and 5%) respectively. All three antibiotics are able to inhibit the total production of volatile fatty acids, but Peniciline is the less effective. Kanamycin and Colistin increase the relation aetic-propionic, but Penicillin does not. None of the three tested antibiotics has a possitive effect on the propionic acid production.
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