If I'm interpretting the code at the bottom correctly, this batch of Optimal was produced on 4/10/2019 and it's been in that plastic container in our basement, which stays fairly cool, so I'm thinking we're probably okay on this particular bag of feed.
It's early to report back, so take this with a grain of salt, but we haven't seen any more dead YP since that last one, so it doesn't appear to be any big mass extinction going on. Thanks Bill for being the force of calm here and sharing your expertise; it's too soon to say for sure, but I believe it's probably just as you say -- a stray latent death still due to all the stocking stress.
