Resumo

MARGUETA, Emilio Rogelio; LEDESMA, Pablo  e  VALLEJO, Marisol. Soluble phosphorous availability in experimental silage fermented with a Lactococcus lactis subsp. lactis strain with high phytase activity. Rev. Soc. Ven. Microbiol. [online]. 2013, vol.33, n.2, pp.116-121. ISSN 1315-2556.

Phytate is the main phosphorous storage form in grains and seeds, but phytate linked phosphorous is inaccessible for fishes. The purpose of this wok was to study the efficacy of Lactococcus lactis subsp. lactis Tw34 for liberating phosphorous in an experimental feed which contained cereal flour. The inoculating bacterium of the biological silage was selected due to its high phytase activity, and the mixtures were prepared with waste hake products (Merluccius hubbsi). Sunflower, corn, wheat and barley flours were mixed with waste ground hake products up to 25% and inoculated with the bacterium mentioned. After 7 days fermentation at 18 oC, the best results were obtained when barley flour was used. The strain was able to reduce the pH value to 4.4 and increase four times the initial concentration of free phosphorous. The results suggest that Lactococcus lactis subsp. lactis Tw34 can increase phosphorous accessibility in cereal flour based diets, avoiding the negative effects of phytic acid on the bioavailability of minerals and proteins, and decreasing the liberation of phosphorous residues.

Palavras-chave : silage; phosphorous; phytase; phytate; Lactococcus lactis subsp; lactis.

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