Build the feed factory as soon as it is unlocked to produce feed for your cows, chickens, hens, and pigs. You will get three feed bags per box.

Tap on the desired shed to feed your animals. Then, drag the feed bag over those animals you want to nourish. Each animal will spend one bag. Once the feeding time is over, you can collect the fresh goods from the barns by swiping your finger across the products. They will be stored automatically in the supermarket warehouse, as usual.