Much of what I've truly learned thru repeat use about feeding was while looking closely at bad advice offered as homemade feed recipes from youtube and various websites (Garden Betty, I'm looking at you!) SOME of the old info still holds up really well, some I find less useful - either because chickens themselves have changed with modern breeding efforts in the last 50 years, or because the assumptions have changed in the way we keep them - a couple scrawny birds free ranging a homestead with a field of grain and a number of other animals is a lot different than life in a backyard 8x10 runI've got a few of those "old school books" not to mention some very interesting advice/opinions/experiences from chicken keepers whose families have been keeping chickens for many generations. There is an awful lot of knowledge that just doesn't feature on modern day chicken keeping sites that to me seems more relevant and accurate than much of todays internet advice.