Years ago there was a trend of soaking oats to make them "easily digestible" for poultry. It wasn't true since many found that by doing that, their birds regularly had diarrhea. If you think about it, the fermentation process is the result of bacterial action, so anything that is fermented is a perfect environment for bacteria and germs to grow. Not the good ones like lactic acid bacteria either. When the intestinal tract becomes irritated, enteritis ensues, among other problems. You had a concern about "slimy" food as a result of fermenting feed, so it would seem logical to stop doing that. Especially with the amount of people, many who've posted in the Emergencies & Diseases section of the forum, having problems as a result of fermenting their feed.
If the pH is low enough (I've seen 3.8-4.5 as suggested range) then my understanding is the bad bacteria generally don't "win". They may still be present to some degree, but the acidic environment makes it difficult for them to thrive, and easy for the lactic acid bacteria to not only thrive, but also destroy or consume the bad bacteria. A few lone salmonella or E. coli bacteria won't kill a normal healthy adult human or chicken. It's when one consumes large quantities of these bad bacteria that our own digestive systems can't destroy enough of them...and then we get sick.
Lactofermention is how humans put up food for winter before canning and freezers came along. My experience with fermenting all sorts of things is that while a lactofermention project can go bad, it's very rare and a high or rising pH will confirm this.
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