Hi Y'all ... Ive been fermented feeding my chickens a Chick'N'Mix from the feed store here in South Africa.  My meaties love it, its got whole grains (sunflower, flax, corn, pea).  I ferment it a few days & keep topping up so there is that sourdough aroma (like a little yeasty).  I mentioned what I was doing to the lady at the feedstore & said I should look out for the birds developing 'Sour Crop'.
Any of you learned guys have any input or advice on this?
From what I understand, fermented feed, although slightly sour/fermented is actually pro-biotic, and is lacto-fermented (like youghurt), as well as pre-digested (so shouldnt impact/compact the crop).  Additionally it develops the anti-nutrients into a more usable form for the birds.