Silage is a green fodder kept isolated from the air. Preservation is carried out through fermentation processes, as respiration and anaerobic fermentation produce alcohol and organic acids, which increase the acidity of the feed to the point of stopping spoilage factors. Preservation also has other advantages, including that it leads to an increase in the proportion of protein, carotene and nutrients. Besides, it leads to the killing of weed seeds present in the forage plant, which reduces its spread. It also has a taste of the preserved substance, which reduces the part rejected by the animal. Conservation is done in what is known as the silo or silo, which is either in the form of a pit, walls or cement towers. The fermentation period is 3 days (weeks).