I have 6 star cows and 5 of them are girls. Should I leave the 7th spot..

Sell your boy?! That sounds pretty sexist. Anyway, if you do, you might as well sell all of them. Without the boy, the cows can't get pregnant, and therefore wouldn't produce any milk, and therefore would be useless for eternity(Oh yeah, we're so important!). You wouldn't want your cow clique to end up like the goat, do you?

Well, it depends on how you like your cows and how you breed them. I don't even bother buying a boy star cow because I just use the miracle potion. I think you could sell your cow, get more star cows, use the miracle potion, and have more milk. And you know, more milk = more money!!!

Well you should sell some of them, and here's why: 1. You want milk (milk=money) 2. To get milk the cows have to have babies. 3. If you're slots are filled, they can't have babies 4. If they can't have babies, they won't give you milk

Don't sell your boy, it's important if you want milk. And you should leave the 7th spot open because if one of your cows has babies then you will have a place to put it.