It seems to be bugged. I figuring out what's wrong with it with the publisher. Generally it should appear as chickens, after day 15
I started a new save thinking maybe it's not populating because the first save is 244 days. The new save has 48 days and no cows! I have the DLC so I don't understand why it hasn't shown up in the game now.
When can we expect the DLC to be debugged or fixed? Should I delete the game and then redownload everything?