Thats why I would cull them. Somewhere down the road, there will be a line with bent spines if they are bred. Given away, then given away, then bred for fun, then given away...etc. In any breeding program, from dogs to horses to pigs to fish, a responsibilitie goes along with breeding to uphold the breed. Sometimes a heavy hearted task comes along with the newborn. Deformities are not the same as faults. As a breeder, you cull the weak, and breed the strong. This is the only way you can try to keep the balance that nature would keep if they were in the wild. I'm not saying cull anything that is not the very best, but deformities should be put down, and the source looked at very closely.