I feed S&P milled food, and I started fermenting some about a month or two ago. They don't ever eat the powdered fines, oyster shell, or some other crumbly thing in there (I think maybe camelina meal?), so what I have been doing is this:
Whatever powder is left in the dry feeder at the end of the day, I put into a quart yogurt container with a scoop of the grains (I found the powder alone doesn't ferment) and add water. I keep 3 containers in rotation, so that each day I feed them the feed I started fermenting 3 days ago.
My procedure is that every morning, I pour off the water on top of the fermented feed and put it in the run in an open feeder I have for them and take out the dry feeder. Once it's gone, or in the late afternoon, I put the refilled dry feeder back in the run. Up until a day or two ago, they would eat all the fermented feed within 30-60 minutes. The past few days, it has been sitting there barely touched all day. When I finally put the dry food back in, they attack it and each everything but the powder, of course.
What has gone wrong? I liked that the fermented food was getting them to each all the stuff in the powder that I know their bodies need, and also it was making the expensive feed last much longer. I thought if I left it out there with no other food, they would eventually get hungry enough and eat it, but how long do I let them go? Could something have gone awry with the food?