Hypothesis 2 : Possible congenital deformity or conformation difficulty that may have lead to increased likelihood of birthing difficulties. Given the information from the case we know that this was a dystocia situation presumably due to the fact that the calf was too large for the cow to give birth to naturally. It is possible that because this pregnancy was due embryo transfer and the fact that calf size is in part due to the sires genetics, that this calf was genetically too large for the uterus of the cow. During pregnancy the calf may have been forced to configure its self inside the uterus in such a way that the legs were not allowed to develop properly. One possibility is ostogenesis imperfecta which is a generalized inherited bone defect in cattle. It is characterized by extreme fragility of bones and joint laxity. The long bones are slender and have thin cortices. Calluses and recent fractures may be present. The inheritance is most likely polygenic. Thus, at birth, the legs of the calf may have been unusually prone to fracture due to inadequate nutrition, blood supply or other factors that may have been possible within the uterus. Therefore when the calf was extracted at birth, given the proper methods were used, the leg was fractured because it was potentially deformed prior to birth.