I googled "benefits of fermented feed" and came up with the same article as Miledero, I don't think it matters what animal it is, the feed should still have the same amount of nutritional values. But I personally am not going to feed it fermented. This is what I am doing
Sprouting seeds as healthy treats for my chickens.

here.. clicky linky :
https://www.google.com/webhp?source...2I&fp=623bb94042e843ac&ion=1&biw=1600&bih=809
cattle have also been fed fermented food for hundreds of years (silage)