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In a search for alternatives o f in-feed antibiotics, the antimicrobial activity o f caprylic (C8:0), capric ( C I 0:0) and oleic (C 18:1) acid was investigated in pure cultures o f 19 strains o f rumen and rabbit caecal bacteria, and in incubations o f the rumen and rabbit caecal contents. In glucose-grown bacterial cultures the min imum inhibitory concentration ( M I C ) o f caprylic acid ranged from 1 to 3 u T m l 1 . Two strains o f Bacteroides ovatus were less susceptible to capric than to caprylic acid. In other strains, the M I C o f capric acid was 0.25-0.50 uTml~ . The growth o f most strains was not much affected by oleic acid. A n exception to this were rumen bacteria Butyrivibrio fibrisolvens ( M I C from < 0.05 to 1 uTml" ) and Lachnospira multiparus ( M I C o f 0.25 to 1 uTml" ). In incubations o f the rumen and caecal contents caprylic and capric acid decreased the production o f volatile fatty acids and gas, and increased production o f lactate. In latter incubations the inhibitory effects o f caprylic and capric acid were similar. In incubations o f the rumen contents, capric acid was more efficient than caprylic acid when supplied at low concentrations (<1.25 u T m l 1 ) , but less efficient when supplied at 2.5 and 5 uTml" 1 . Effects o f oleic acid in rumen and caecal cultures were not significant, except the increase in production o f lactate by rumen microorganisms. It can be concluded that microorganisms o f the animal digestive tract are susceptible to inhibit ion by caprylic and capric acid added to microbial cultures at fairly low concentrations. Oleic acid was far less effective. K E Y W O R D S : fatty acids, rumen, rabbit caecum, bacteria, inhibit ion, fermentation * Supported by Grant No. 523/02/0460 o f the Grant Agency o f the Czech Republic. The authors wish to thank the donors o f the cultures 3 Corresponding author 508 GROWTH OF RUMEN AND RABBIT CAECAL BACTERIA

Effect of caprylic, capric and oleic acid on growth of rumen and rabbit caecal bacteria