Here you can sell all your milk production, the money you earn from the sale of milk is shared on two type of accounts you have (investment type and withdrawal type).
The investment type is the Gold that allow you to reinvest in the game, and the withdrawal type is the Gold that you can turn into real money and recover via Paypal.
Sharing proportions: 70% for the investment type et 30% for withdrawal type.
Selling rate of milk: 100 milk bottles = 1 Gold.