Darn, I always miss the night owl discussions! Lark is up and at it now tho.
Just to be clear, we are talking about Purina Flock Raiser, both pellets and crumble??
I have used this feed almost exclusively for 5 years, just the crumble formulation.
Powder in feed can be from the way it was processed, the 'crumbler' can produce a coarser or finer result. This could be from the formulation itself and/or the operation of the equipment and/or the handling after the crumbling, bagging, trucking, etc. Have had a few bags that were much dustier than others...and some that were funky in other ways. Grain mites will definitely create 'dust'.
They are almost microscopic, look
very closely for moving white specks. The way I first noticed them is that there were
so many all over the outside of the bag. Store had pallets just
covered with them, only a few brands and types. Thus began my journey with and education about
https://www.backyardchickens.com/threads/grain-mites.981212/
I doubt it, but it could be a factor. I still don't understand
how hot is it? And where the moisture came from.<shrugs> Could have happened anywhere between the factory and your home. Likely a multifaceted situation and hard to gather all the detailed facts after the fact. Now you can pay more attention and keep some notes maybe. I have started to record the mfg codes on all feeds. PFR is one of the easiest to read, compared to the few others I've purchased and some I've seen on forums.
@Folly's place .. What feed was it, brand and model?
Yep, TSC told me their shelf time protocol is 6 months, whether that is dictated by the feed companies or TSC , I dunno. I seriously doubt that feeds are tested for the longevity efficacy of the vitamins/minerals/amino acids and other nutrient values. That's why there is not a 'use by' date on the feed bags like there are on drugs and human foods. The fresher the better, for sure, but the freshest I've seen in my store is a couple weeks old, average is 1-2 months...especially since I mentioned it(several times) to the staff. Supply and demand plays a big part there....could go on and on about that, but gotta go let the birds out.