The damp storage process for cattle feed. It can be in silos (above ground or buried).
Some PDO cheese producers do not allow ensilage to be used as it is sometimes not well handled and can lead to butyric fermentation which is bad for long maturing cheeses. These days ensilage well managed in the hands of the cheese maker avoids most of these problems. Ensilage has incontestable nutritional properties and favours an energetic diet.
I say "Bravo" to my friend Michel for this definition! I grumble too often when I'm told that silage is bad for cheese. It's bad for hard cheeses when it's adversely handled and the cheese rounds split. But not for all cheeses ... what's more, cows just love this fermented fodder, more or less the same way that we love sauerkraut!