Preserved fodders, such as silages, are a type of food that has been preserved for long-term storage. Silages are typically made from grasses, legumes, and other crops that have been chopped, fermented, and stored in airtight containers. This process helps to preserve the nutritional value of the food while also preventing spoilage. Silages are commonly used as animal feed, but can also be used as a human food source in some cases.