There is a currently a glitch in  Farmville that gives you free cows. You will need at least one Cow (any kind) in your gift box and  10,000 coins to purchase a required Dairy Farm.  Who knows how long this will last or when it will be fixed so take advantage while you can!

1. Purchase a Dairy Farm in the Farmville Market.
2. Place Cow from your gift box directly to Dairy Farm. Do not place the Cow down anywhere else on your farm.
3. Return to giftbox and there should still be another Cow.
4. Repeat until you have the amount of desire cows or until you run out of room on your farm