Brewer's grains silage: duration of storage and use of different silage additives.

摘要

Fresh brewer's grains are perishable. Ensiling is an alternative to feeding fresh brewer's grains. In two trials, the influence of the duration of silage storage as well as the use of different silage additives on the quality of brewer's grains silage were examined. Brewer's grains were ensiled in 30-litre barrels with juice discharge. Aside from a treatment without additive in the first trial, the product Mais-Kofasil, and Mais-Kofasil, Luprosil and potassium sorbate in the second trial, were usedas silage additives. After 1, 3 and 6 months in the first trial and after 3, 6 and 9 months duration of storage in the second trial, some barrels were opened and nutrients, fermentation parameters, some microorganisms and aerobic stability were determined. Effluent flowed from all barrels during the entire duration of the trials. The major part of the effluent was observed during the first days. With increasing storage duration, lactic acid contents decreased and acetic acid contents as well as pH values increased in the silages; this was indicative of deteriorating silage quality. The highest yeast and mould contents were observed when the duration of silage storage was shortest, when yeast contents decreased and when silages had warmed-up. The two silage additives Luprosil and potassium sorbate were able to suppress yeast development and to improve aerobic stability even at a short storage period.