If by a break in the back, you are talking about the muscle creating either a hump or a dip, then yes, we had a gilt with a break...more in the loin than between the shoulders. Feed did not solve the problem. We could not lay on fat or muscle to make it go away. She was a nice looking pig, too, except for the break in the loin. It's structure, and you're probably not going to feed it in or out of them. :?