Here is a simple mod as we have seen blooming on Farming Simulator 19 for some time: A processing plant. This mod has two of them. One for the ration of the cows, the other for the pigs. Each of these 2 factories has 3 bins in which the player will pour the ingredients necessary for the manufacture of food. Each container can hold 30000L, for a total of 90000L of food from the factory.
For your cows, the mixture is classic. You need to add hay, straw, and silage. For pigs, it is more complex since it will be necessary to add a cereal (your choice: wheat, barley or oats), a tuber (potato or beet), and proteins (rapeseed, soy or sunflower). The factories then produce a complete feed at the rate of 5000L per hour. Sufficient quantities even for large farms.