Living Fences in Costa Rica a Growing Idea
Farmers across Central America plant living fences because these 
green barriers are a more economically feasible and readily accessible 
method for containing livestock and protecting crops. 
.... 
By providing some shade and serving as windbreaks,
 living fences can significantly decrease the amount of energy farm 
animals need to regulate their body temperatures. As livestock allot 
this extra energy to growth and, in dairy cows, producing milk, farmers 
experience higher yields, whether in meat or milk, for planting living 
fences.
This is simply cool.  (Ha!  Literally, too!)