When silage is exposed to air, its quality can deteriorate, as valuable, easily digestible nutrients are broken down by yeasts and moulds. There is also a risk of mycotoxin formation. Signs of the growth of these micro-organisms cause an increase in the temperature of the silage and typical discolorations (blue-green, red) in the form of mould nests (hot spots). This particularly affects well-fermented, high-energy silo maize, but silage made of grass and whole cereal plants may also display signs of heating on exposure. Ensiling mistakes such as poor compaction, ensiling forage that has been harvested late, or insufficient turnover increase the risk of such processes. This can be avoided by applying good farming practices and using GopiSIL range of silage additives.