Abstract

HERAS-SIERRA, Teresa et al. Behaviour of Escherichia coli in cow feces added with of hydrolysable tannins. Abanico vet [online]. 2016, vol.6, n.3, pp.47-54. ISSN 2448-6132.  https://doi.org/10.21929/abavet2016.63.4.

To evaluate behavior ofE. coliin feces of dairy cows added with hydrolysable tannins, an experiment was conducted, in which aliquots of 100 g were randomly assigned to two hydrolysable tannins levels (0 or 10%), three values of pH 5.2, 6.5 and 8.3, and cultured at 0, 2, 6, 9, 15, 22, and 30 days after tannins addition. Feces added with HT 10% shown the highestE. coligrowth (P< 0.01) compared to those that did not received HT (Log105.071vs.Log104.401). Feces with 6.5-pH value had lower values (P< 0.01) ofE. coli(Log104.525)vs. pH 5.2 (Log104.866), and pH 8.3 (Log104.816). In all cases theE. coligrowth diminished (P< 0.01) as increased days number (Log10= 5.51 day 0; Log10= 3.36 at day 30). The results suggest that HT did not inhibitE. coligrowth in feces of cows; however, at pH values close to neutrality theE. coligrowth decreases.

Keywords : coli; hydrolysable tannins; cows; pH.