NAVEL RUPTURE.
(Umbilical Hernia)
Cause.—Hereditary predisposition is well marked in this complaint. It may exist at birth, but so-called congenital rupture may very probably be the result of the pulling which the navel-string underwent at the time of foaling. However, umbilical hernia usually occurs during the first two or three months after birth; that is to say, while the opening at the navel is becoming obliterated and the tissues at that place are becoming consolidated. They can, however, appear later and may result from more or less violent strains sustained when the foals are jumping or playing. At other times these strains are induced by intestinal irritation accompanied by diarrhoea or constipation with straining. But, however the strain may take place, the abdominal muscles contract and push the intestines towards the wall of the belly. Then if they find an opening or even a weak spot, like the ring of the navel while it is undergoing the process of becoming blocked up, they select it and a rupture is produced.
Symptoms.—This rupture, the situation of which clearly shows its character, may vary in size from that of a hen’s egg to that of an ostrich’s egg. If pressed upon with the hand, especially if the animal is placed on its back, the rupture will disappear, to return, however, when the pressure is removed. If it be composed of intestines it will be soft and elastic when the bowels are empty, but when they are full of semi-solid food they will be doughy. In any event, the tumor will feel elastic when composed of intestines, but when formed of its connecting membranes, will naturally not vary in consistence. If intestines be present, movements and abdominal rumblings may be detected in it. This rupture rarely gives rise to serious consequences because its contents are composed of large intestines and omentum, either of which is, in this position, not liable to become strangulated. It may, however, become engorged and inflamed from injury. Its existence naturally depreciates the value of an animal suffering from it.
Treatment.—In the majority of cases, they will disappear of their own accord in two or three months. In case the rupture shows no signs of diminishing in size it is well to apply a bandage around the abdomen.