Why does your hen walk funny?

Chickens that are raised for meat are breed to get as large as possible in the shortest amount of time and are meant to be processed by the time they are about 6 months old. Their leg muscles are not strong enough to carry them after a while, and will eventually effect their overall health, until I think they die of a heart attack???? I bought a small chick from the feed store and didn't know what I had gotten until she started having trouble walking and I research the breed. I was really upset that the feed store had sold me this one small chick and could not have at least told me what they were raised for and what would happen to her. I learned a lesson.