All treated animals will be observed daily to carefully control the amount of food that will be consumed and thus the potential loss of appetite. Will be look for evidence of possible inflammatory and degenerative processes affecting the skin of the abdominal wall, the symptoms of infection or rejection of the prosthesis. If weight loss will be excessive (e.g. more than 10% of the normal weight of an animal of the same race, the same age and in comparison to the control group), or the animal will show clinical symptoms of suffering more than a normal postoperative, will be subjected to general anesthesia and then deleted.