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Abstract
The effect of Kanamycin, Colistin and Penicillin -using dosages from 0.125 up to 6.250 mg/mI; 500 up to 15.000 U.L/mI and 50 up to 2.500 U.L/mI respectively- over the fermentation of urea has been studied using the Tilley and Terry rumen fermentation "in vitro" method. Al1 of the three antibiotics at high dosages increase the ammonia concentration and reduce the fmal amount of precipitated nitro gen because of the inhibition of the microbial population growth. The efficiency of antibiotics at the used doses is maximal for Penicillin and minimal for
Kanamycin.
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