Abstract

VILLA, Andrés F et al. Study of microbiological and nutritional quality of corn silage in two Colombian ecosystems. Rev Colom Cienc Pecua [online]. 2010, vol.23, n.1, pp.65-77. ISSN 0120-0690.

Initial concentration of the most important genus of lactic acid bacteria (LAB) in two maize varieties (warm and cold climate respectively) was evaluated. Growth rate for each genus throughout the process was compared at 0.1.2.3.4.7.14.28 and 56 days from silage sealed. Variation in pH, acetic acid, lactic acid and reducer sugars concentration were compared within silos. Nutritional quality between fresh forage and final silage was also evaluated. Significant differences (p<0.05) were found in the initial concentrations of LAB between treatments, being greater for warm climate. pH value in this treatment diminished significantly (p<0.05) faster than the one of cold climate, although there were not significant differences in their final concentration. An increase in the LAB populations was observed from the fermentation beginning until pH reached levels below four, except for pediococci genus who reached their greater growth at pH near 3,9 being significantly greater for warm climate LAB. Initially the Lactobacilli and Leuconostoc genus had more concentration in both climates, followed by the Streptococci and pediococci. There were not differences in the organic acid concentrations, nor reducer sugars between treatments. Silage Nutritional quality was similar to fresh forage, indicating an optimal conservation process.

Keywords : fermentation; lactic acid; lactic acid bacteria; lactobacill; pediococci.

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