Better life conditions gives off better meat in animal farms

To encourage players to get creative and build more, make it so that the meat animals drop on a farm is better or worse depending on their well-being, which should depend on conditions like:

Is the farm big enough? Does it have water? Does it have decorations? (Like leaves, to put an example). 

This would unconsciously prompt the player to build more things in functional farms aside from a square of fences.