$MILK Production
You'll need to have a land and cows in order to produce $MILK (no need to have bulls for that), and milk production will be determined by the rarity and the amount of Cows you have in your land.

Cows Milk Production by Rarity

Cow Rarity
Milk Production
Average Milk / Day
Common
5 MIlk / 120 Hs
1
Uncommon
8 MIlk / 96 Hs
2
Rare
9 MIlk / 72 Hs
3
Legendary
10 MIlk / 48 Hs
5
Holy
8 MIlk / 24 Hs
8