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An experiment was carried out to evaluate the effects of saponin-rich extracts (SRE) from three tropical fruits on the growth of two rumen bacterial species. Ruminococcus flavefaciens and Fibrobacter succinogenes were cultured in a defined medium that contained 0, 3.0 and 5.0 mg·ml−1 SRE from Sapindus saponaria and Pithecellobium saman fruit and also purified saponin from Quillaja saponaria. Bacterial growth was spectrophotometrically measured at 620nm. Adding 3 and 5 mg·ml−1 of S. saponaria SRE concentrations and 5 mg·ml−1 of P. saman SRE reduced (P<0.05) R. flavefaciens growth whilst F. succinogenes growth, was completely inhibited (P<0.05) by 3 and 5 mg·ml−1 S. saponaria SRE and 5 mg·ml−1 P. saman SRE. Reduced F. succinogenes growth was only observed with 5 mg·ml−1 purified Q. saponaria saponin. Results from this experiment showed that SRE from three tropical fruits affected the growth of two of the most important cellulolytic rumen bacteria, especially Gram negative bacteria F. succinogenes.

ciencia y tecnología agropecuaria

Efecto in vitro de extractos ricos en saponinas de Pithecellobium saman y Sapindus saponaria sobre el crecimiento de dos bacterias celulolíticas ruminales