I am wondering how much feed is required to feed 5 grown chickens, 13 ten week old pullets, 3 guinea 24 week old keets? A fifty pound bag of feed seems to dissappear pretty fast. Could I be over feeding them?
You'd have to define "pretty fast". You'd likely burn through that bag in just over two weeks.
You have 21 mouths to feed, right?
That said, if you leave feed out 24/7, you likely may also be feeding various rodents and such as well. You'd have to describe your feeders and feeding program in more detail to tell.