My problems with Manno pro were similar to Ramjets, except that I was buying the SHO feed.
I used man.a pro select (16% protein) in my first year of keeping rabbits , never had a problem .... then I started getting batches that smelled very strongly of molasses & had loads of unprocessed corn as well as being overly dusty.
OK, so the molasses smell wasn't all in my head? I remember checking the ingredients to see how high up on this list it was because I could smell it so strongly.
I can say, a year after the switch, I did not realize how much trouble was being caused by the feed until I switched OFF of it
After the switch, Mucoid enteritis completely vanished from my herd.
(The v-lops never got mucoid enteritis to begin with, their digestive issues were more unusual, and I doubt any feed would have help them.)
I kind of hate the Purina corporation, but the local "Purina complete" available to me is more consistent than the manna pro SHO feed.