NO!
As with all chickens, leghorns should be provided with crushed oyster shells, available at local feed stores, to aid in egg shell formation.
You feed CHICKENS by right clicking them with seeds.
Chickens will eat a variety of feed. Feed stores have chicken feed in bags you can buy.
Chickens are omnivores. I feed ours their own crushed up egg shells and even some small meat scraps. Coffee grounds and whatever, I no longer compost. I have chickens for that. The eggs are divine. Feeding the shells will improve the shell strength of future eggs. Chickens will even eat each other, but that doesn't sound delicious. I would steer clear of recycling motor oil via chicken feed. Feed them a varied diet of healthy stuff and they will give you a healthy return.
You cannot change the color of the egg shell, genetics are pre determined at hatch and the color of the shell is not effected by feed. You can change the color of the yolk with feed but not the shell itself. The color of the shell is due to a bile duct secretion as the egg is forming in the oviduct of the hen.
feed
No.
Most fruits are fine to feed to chickens. However, never feed your chickens any kind of citrus.
You feed it to the chickens that are in town
Chicken feed is a mixture of special pellets, cereals and various seeds (millet, sunflower, etc), even grit and crushed shell. Chickens are omnivorous and will eat worms, insects, and anything crawling.
no
You can only make shells thicker BEFORE they are laid. That is why hens that are laying are fed oyster shell. It supplies calcium for good egg shells. If a shell is to thin, it breaks to easily, if it is too thick the chick cannt "pip" which is a term for the chick pecking a hole in the shell as it hatches. If the shell is too thick, then the chick can never be born, and winds up entombed in its own shell, and very dead.