Some eggs are marketed as "Vegetarian", but anyone that has free range knows chickens aren't vegetarians.
Most people have co ncerns over their food. Most people cannot research every food ingredient. They depend on what they think the words mean. Food producers capitalize on this by inventing words that seem to be good or better.
Stores can increase sales by marketing their meat as "pasture raised", but that is meaningless. Adding "hormone-free" on chicken creates the false belief that some chickens are fed hormones. Not true. But it sells product.
Few people know that makeup and lipstick comes from piles of animal guts, hooves and hide. All by-products.
Because of "Mad Cow", BSE, cow, goat and sheep by-products are not added to cattle feed. But millions of pounds of animal byproducts are added to other feed.
Rendering plants collect guts, bones, used cooking oils, trimmed fat, hooves. Thee oils are made into bio-diesel. The hard fats to cosmetics. The rest is ground and cooked into a product that looks like greasy coffee grounds. It is tested for contaminates and then added to livestock feed.
When you buy pet food that says beef, chicken or pork, do you really think it is ground rump roast, chicken breast or pork loin? Spleen from a cow is beef, feathers from a hen is chicken and pig lungs are pork.
I see lots of so called livestock feed that has for the primary ingredient "grain by-products". That's not grain, folks. That's almost grain.