Major problems in silage processing are due to failure to apply good manufacturing
practice (GMP). To improve silage preservation and guarantee the quality of this animal
feed, silage additives such as chemicals, enzymes and bacterial agents can be employed.
The purpose of the present paper is to review existing information on the desirable and
undesirable microorganisms involved in silage processing, and possible methods, using
GMP or silage additives, of limiting silage degradation and its economic effects and health
impact on animals and humans.