Crowing roosters are the price you sometimes have to pay for the privilege of living where you're not listening to traffic noises and smelling exhaust all day. Fermented feed is feed that has had water added, to make it the consistency of cooked oatmeal. You let it sit for a few days until it starts to bubble. Kind of like the old timer method of making a sour dough culture. The natural blend of bacteria and yeasts that culture into the feed break down the anti-nutrients in the grains, kind of do a bit of pre-digestion, so that when the birds eat it, it's easier for them to digest it, and they get more nutritional benefit of the feed. I never use medicated feed. A comparison of milk to yogurt would be similar to a comparison of regular feed to fermented feed. (in that the uncultured product does not have all of the health benefits and ease of digestion of the cultured product.) There are plenty of threads about fermented feed, if you're interested. Just do a thread search in the top blue bar.