My wife & I are 4-H leaders here in So. Ca. for the last 18 yr. now, every group of kids we get we try & teach them "about" processing, yes we do butch the birds, but we just doing have a blood & gut thing, we make it a biology & study how the bird is put together & how the body works, like show them what they have eaten in their crop, gizzard & intestine & how the food is lprocessed in stages, along with splitting along with explaining the heart. We have found that the older the kids the more problems we have, the younger ones are fasinated by it & the parents are fine with it & interesed also. We don't make them watch the "kill" if they don't want to but encourage them for the rest & also to help if they want, again the younger the easier to join in the processing. We use the word processing with them because it is no as scarey or neg. sounding
Our own kids we started them butchering all of our animals, pigs rabbits, goats, beef, etc at five. The larger animal I'll even take an eye & split it at have the kids study it. This is what we call science