On playing the Agricola Bielefeld minor improvement called Bielefeld Playing Cards, does it include animals?
You are right, the chances of getting any cows on your farm are going to be limited.

There is a nice post about the deck that includes a discussion of this card.

You are getting a lot of points in exchange for a lot of extra management of resources, so that is all factored in.  You have to decide if it is worthwhile and it probably depends on what other cards you might have that could assist.