A good active thread on fermenting feed; https://www.backyardchickens.com/t/644300/fermenting-feed-for-meat-birds
I differ from how some on there do it though. Upon much reading up on the subject from many other various sources I do not add ACV, adding ACV makes it go acetic acid ferment, sauerkraut is a lactic acid ferment, letting the feed naturally ferment is lactic acid ferment, which I believe is better.
A pretty good audio podcast on the subject also, warning, long and boring, but a lot of good info, I did a load of dishes, peeled a few dozen eggs and pickled them listening to it;
http://www.urbanchickenpodcast.com/ucp-episode-048/
I differ from how some on there do it though. Upon much reading up on the subject from many other various sources I do not add ACV, adding ACV makes it go acetic acid ferment, sauerkraut is a lactic acid ferment, letting the feed naturally ferment is lactic acid ferment, which I believe is better.
A pretty good audio podcast on the subject also, warning, long and boring, but a lot of good info, I did a load of dishes, peeled a few dozen eggs and pickled them listening to it;
http://www.urbanchickenpodcast.com/ucp-episode-048/