In Farmville, calves grow up into cows only if they are placed in the Nursery Barn.
You can now raise your baby foals and calves in your Nursery Barn!
Each Time you Harvest from a Nursery Barn, you have a chance for one of your animals to grow into an all new adult animal that you can keep!
Today.. you can no longer buy Nursery Barns. You can only get Baby Playpens. Baby Playpens only get you MORE babies. You can grow the calves up is you pay 15 Farmville Cash.
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Every time you harvest the nursery barn, in which you can place baby calves and foals, you have a chance for one of your baby animals to grow into an adult animal. Baby animals won't mature if not placed inside the nursery barn.
If you want any baby animal to grow up, you first have to build a nursery barn, and you put the animals in there, and you have a chance of having a grown up animal, you can only have a chance every 24 hours.
You place it in a nursery barn which you will find in the Market then you will harvest it and hopefully on week it will grow up to be an adult bull.