Is a common term for bovine traumatic reticuloperitonitis.

It is usually caused by the ingestion of a sharp,  metallic object. These pieces of metal settle in

the reticulum and can irritate or penetrate the lining.

Cattle commonly swallows foreign objects because they

do not use their lips to discriminate materials before ingesting  and they do not completely chew their food before swallowing.

Sharp metal objects, such as nails or wire are the common initiators  of hardware disease. The object travels into the rumen and then  pushed into the reticulum along with the rest of the feed.

In some cases, contractions of the reticulum can push the  object through the part of the reticulum wall going to

the peritoneal cavity, where it causes severe inflammation.

In rare cases, the metal object penetrates the entire wall of the  reticulum and can pierce the heart sac, causing pericarditis.

Compression of the uterus in late pregnancy,

straining during partuition and mounting during estrus can

increase the likelihood of the object penenetrating the abdominal wall or the heart sac.