Breast milk can often be low in vitamin D which is necessary for the proper formation of bones. (newkidscenter.com)
There are several disorders in the elbow that comprise elbow dysplasia, all involving abnormal formation of the bones of the elbow joint. (www2.vet.cornell.edu)
The protein that is involved in the proper formation of bone is in some way affected by a genetic mutation. (catbreedsjunction.com)