Animal Feed can be bought from the store with Meteor Credits. They will fertilize only 1 animal, not all your animals. There are two types of animal feed, Animal Feed, and Mega Animal Feed.
Purchasing any animal feed will not give any experience, since the animal feed is not a "tangible" item and can be used to boost your experience by making animals harvestable faster.
This animal feed costs 25 MC and will speed up an animal's growth and harvest time by 24 hours.
Mega Animal FeedEdit
This animal feed costs 50 MC and will speed up an animal's growth and harvest time by 48 hours.