The main reason why I start raising chickens was because I wanted healthier eggs. Meat is one of the most important ingredient in a chicken's natural diet (earth worms, bugs...etc) however chicken meat is not a natural ingredient for chickens. Of course they love the meat and go crazy for it. Their body needs that protein and since they live in confined areas and have no access to bugs, it's up to us to supplement the meat. I give my chickens very small quantities of meat every now and then, even thou I know how much they love it. Since my chickens are feed on scratch and kitchen scrap (vegetables, fruits, pasta, and rice) I prefer to give them scrambled eggs for the protein supplement and the meat is just a rare treat. I try to keep them free range an hour/day and that's when they get their chance to look for bugs.
PS: did you know that all major chicken farms (like Perdue and Tyson) used grind up chicken in their feed (that's the crude animal protein). The rest of ingredients are corn and other ingredients (vitamins...etc)
Basically in the chicken processing plant after the chickens are cut, process, and prepared for US food market any chicken parts that can not be sold (the feet are sold to China) go in a big grinding machine and process for chicken food that will supply all the chicken farms employed by Perdue or Tyson. I know this from a trusted source who actually works in a Perdue processing plant. Nothing is thrown away. They feed chickens with..... chickens. There is still a big dispute regarding Salmonella cases in US caused by "animal protein" fed to animals. The food industry is the most powerful industry in America and as long they will remain a power, this will never be accepted as a fact.
It's only up to the ordinary individual to select the little information we have and decide how and what we want to eat. I can't afford to eat everything organic, but the few things I have control on I try to keep it as natural as possible
