>You need to have a bigger barn for cows, you need to do all the hay thing, which is very time consuming and demands a lot of extra work just for feeding said cows, you need to pay someone to take care of the cows when they go out to eat in the summer on the communal field

Depends where you are, of course. Some places you just leave your cows out eating grass for years until it's time to slaughter them, then you hire some dudes with helicopters to round 'em all up.

And a barn? For 150,000 cows?