Whey is a protein... NOT a good idea to mix with fermentation... the smell will drive you out of the house. No reason you couldn't add some as you're dishing the FF out to the birds though. Also good to feed to the animals you might have running around (not referring to the cute ones in your avi...
).
For the littles (baby birds) I might try the whey. If I use the feed up within, say, 3 days, will it work and create a good "mother? My FF stays outside, except for the little that comes inside for my baby chicks and turkeys. Is FF good for goats? Could I ferment their sweet feed? My male goat cannot get enough of the chickens FF. He tries to escape every time. When he does, he be lines it to the FF. He prefers it over his own. 
