A building called a Silage pit needs to be added to the game. Animal feed is stored in this building.
In addition, it is necessary to introduce a new secondary resource called silage - this is the green part obtained by collecting some plants, or herbs - root crops and legumes (the green part of beans and peas) provide food for animals, clover, which is already in the game, is also used to make green feed
those.
The building is mechanically similar to a cesspool - vegetables and other plant components are placed there for storage, the output is silage - long-lasting animal green feed