Milk
From PinataIsland.info, the Viva Piñata wiki
Building a milking shed and giving a Moozipan a bell will allow it to make milk., which may have several uses:
- Attracting (or feeding) certain pinatas,
- Fed to a species to produce a variant,
- Can be sold for 280 coins,
- Can be transformed into cheese.
- Feeding a bottle of milk to an Eaglair changes its color to a white variant.
- Feeding an oak seed and a wedge of cheese to a Parrybo changes its color to a yellow-and-green variant.
Leafos hints at feeding milk to young pinatas to some effect...