ENZYMES used in additives are mainly cellulases and hemi-cellulases, says Dr Keady. They break down fibre to sugars which bacteria convert to lactic acid, thereby preserving the crop. But again trials failed to show improved performance.
"There is evidence to show that enzymes do improve silage fermentation, under moderately difficult conditions."
From the mean of four dairy cow experiments and the same number of beef trials, treatment with an enzyme did not alter silage intake or animal performance.