I was eating a slice of pizza while they were out and about in my room . . . yes, I like to dangerously . . . . and a bit of cheese fell on the floor. My tiny little fluff balls turned into raptors . . . . after that I used bits of cheese a few times to get them to hold still for pictures . . .they were 2ish weeks old.
I mentioned it in a post and several people told me chickens can't have lactose . . . apparently mine never read the book, lol. I did stop using cheese.
I'm not sure about the beef though.