Wheat is craftable into Grain, Which you can fill in a feeding troph, which you can craft from wood and logs.
Would be a crafting recipie possibility, glass being air, or nothing. You would right click with grain in hand, Which would fill it with 3 levels like the cauldron. All animals will eat from it, Cows would get milk refilled, Sheep Wool regrow, And Pigs get fatter...they drop more porkchops on death(max of 10)
Creepers can eat it too, and cloning itself...so Hide it well!...XD