The barn is used to store up to 6 items (like your holiday decorations, for example). You can't put animals in it :(
Nope.
Nope
put him in the dairy barn with the cows and you will get calves :)
ok put the bull in a dary barn and it may get a calf!
No you can't yet.
For changing the colour of your barn
Yes, using a Nursery Barn you can get from the Market. Put calfs and other baby animals in the Nursery Barn, every time you tend the Barn, your animals have a chance of growing into their adult versions.
Yes, If you put foals and Calves into the Nursery Barn they will grow into diffront types of cows and horses
You need to be a certain level to buy a new nursery barn
A barn (of whatever colour) in Farmville is a storage facility. In it you can store decorations such as fencing, buildings, ponds, silos and anything classed by the game as a decoration. The barn cannot be used to store animals, trees or vehicles with the exception of the Magnolia tree which is a decoration and does not produce fruit.
Nothing. It Just Looks Pretty :)
When you put the you're foals and cows in the barn it is just like harvesting you're crops or you're animals. After a serten length of time a pink oval will apear over you're barn and just click on you're barm then click harvest.