Stable (Col)

Stables are built in a colony to increase breeding of horses. Once the Stable is completed, horse reproduction is doubled.
==Mechanics==
Building a Stable doubles the maximum productivity. If you have no food surplus, there will be no effect. But if you have enough food the horse number's growth will go from 2 to 4 per turn if you have at least two but no more than 50 horses in Col1, for example.
==Display in Col1==
In Col1 when you have a Warehouse with no Stable the Warehouse is alone and no horses appear anywhere in the colony (except in the production window). Build a Stable, and the visual effect is a fence in front of the Warehouse and some horses (representing your maximum possible production) in front of that. 
If you build a Stable before a Warehouse, you see a little corral with a pale brown piebald horse inside and some white horses (representing your maximum possible production) in front.
==Display in FreeCol==
Graphics have varied as the game has improved.https://sourceforge.net/projects/freecol/forums/forum/141200/topic/3765880/index/page/1
==References==