Effect of organic acids on numbers of yeasts and mould fungi : aerobic stability in the silage from italian ryegrass

Selwet, Marek (2007) Effect of organic acids on numbers of yeasts and mould fungi : aerobic stability in the silage from italian ryegrass. ÁLLATTENYÉSZTÉS ÉS TAKARMÁNYOZÁS, 56 (3). pp. 279-288. ISSN 0230-1814

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Abstract

The aim of these studies was to ascertain the influence of conservants (Amasil®99, Luprosil, Amasil®Combi) based on formic and propionic acids of the cell counts of yeasts and mould fungi in silage. The silage was prepared from Italian ryegrass (Lolium multiflorum L). The effect of the applied conservants on silage oxygen stability was ascertained. The performed chemical analyses comprised the determination of: the content of dry matter, butyric and acetic acids, ethanol, water soluble sugars, crude protein and pH. The applied preparations were found to reduce numbers of yeast and mould fungi cells in all the examined silages. The growth of fungi was strongly inhibited by the Amasil®Combi preparation (containing a mixture of formic and propionic acids and ammonium ions). The yeast cell counts dropped (P<0.05) from 17.8x10® CFU/g FM in the control to 8.4x10® CFU/g FM in the combination with Amasil®Combi, whereas counts of the mould fungi cells — changed from 11.3x103 CFU/g FM in the control to 4.6x103 CFU/g FM in the combination with Amasil®Combi. The applied conservants increased (P<0.05) the content of dry matter in the silage in anaerobic phase. DM was detected in the highest concentration in combination with Amasil ®Combi — 241.6 g/kg DM, the lowest in control — 236.1 g/kg DM. The conservants decreased (P<0.05) concentration of lactic acid in silage in anaerobic phase. The highest concentration of lactic acid was detected in control — 45.1 g/kg DM, lowest in combination with Amasil®99 — 43.2 g/kg DM. The diversifying factors decreased (P<0.05) acetic acid concentration in silage in anaerobic phase. The highest concentration was detected in control — 21.6 g/kg DM, a lowest in combination with Amasil Combi — 17.5 g/kg DM. All conservants decreased (P<0.05) ethanol content in silage in anaerobic phase. The highest content was detected in control — 1.6 g/kg DM, the lowest with Amasil®Combi — 0.8 g/kg DM. The chemical additives increased (P<0.05) WSC content in silage in anaerobic phase. The highest content of WSC was in combination with Amasil ®Combi — 35.1 g/kg DM, the lowest in control — 31.1 g/kg DM. The conservants decreased least of all (P<0.05) the crude protein content. The highest contents were detected in control — 203.1 g/kg DM, the lowest with Amasil 99 — 201.3 g/kg DM supplementation. The additives decreased the value of pH in the examined silages and improve the aerobic stability of silages in aerobic phase.

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