You shouldn't ever need yeast..especially if you've already been experiencing good ferment. Even if a mouse fell in and got fermented along with it all, it should still remain good. Fermented fluids and grains don't usually "turn" unless the LABs run out of sugar to feed upon....that takes a good long time...but shouldn't be happening at all in this situation, particularly if you are adding fresh feed to the mix after you use it.
You don't need to add yeast or anymore ACV, that sour smell you are smelling is very deep fermentation and there is nothing wrong with it. Please, please do not dump out all that feed!!! Feed it anyway...the birds will eat it, trust me. If you are finding you are hitting really deep fermentation before you can feed out your bucket/barrel, mix smaller batches next time if the smells bother you and the animals don't find it as palatable. You won't be seeing bubbling as much at that level as the fermentation isn't just getting started.
Please believe me...your FF didn't turn bad or spoil....the smell is the nature of fermentation and gets deeper into that vomit smell the more it ferments. My chickens eat it every day and are happy to get it, so if your birds are not eating it, cut back on feed a bit until they clean their plates. I've found that, the deeper the fermentation, the less feed they seem to need...I can only conclude the more amino acids are being produced, the more perfect nutrition is available.
Gah! I had husband dump the feed on the compost pile already yesterday about 10am after going to the feed store. The chickens still didn't want to eat any of it on the compost pile. I scrubbed out the barrel, my draining bucket, my stirring paddle and the bucket the paddle sits in. So we are starting from scratch again!

Maybe I have more food snobs! One of my dogs won't eat his food anymore, will eat the other dogs food, not his own. Eats his own poo, the other dogs poo, chicken poo, and the chicken feed but won't eat his expensive dog food! Snobs!
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