Since I have switched from medicated to non medicated feed at hatch, I have lost zero chicks. I've hatched 35 and not a single loss. Before that, I was losing 1-3 each hatch. Sometimes more. None of my broodies were ever given medicated feed, so that got me to thinking. If my broodies never lost any chicks, and the ones I was raising were having a few losses here and there, what am I doing differently? That was my first clue. Once switched, I am a believer.I haven't seen any issues that I can specifically trace to the medicated feed, although I did see last year that it no longer seemed to be working. The batch of layers/meaties that I bought in the spring of last year, before I started the FF, were on the medicated feed and I still had large losses anyway. Plus I am especially wanting to get all of my animals off of any GMO feed, and that isn't possible using commercial feed. I HAVE seen health issues that I am pretty sure are traceable to the GMOs in the feeds, so I am hoping to see improved health and reproduction in my poultry and my goats for 2013 now that they are all on non-GMO feeds.