French term (edited): Jonction gr�lo-colique

This is the junction between the small intestine (intestine grêle in french) and the large bowel (colon) - pigs have a caecum (very small in humans = appendix) which lies at the junction between the jejunum (last part of small intestine) and colon (first ref)
deperitonisation must mean that they have scraped away the peritoneal covering of the intestine at this spot - the intestine normally being covered by a layer of peritoneum which is the same as that which lines the whole abdominal cavity. This term is ussed (with a z) in the second ref below, but it is not very common as an expression - I cannot for now think of an alternative, but deperitonization would be understood (I understand what they mean at any rate!!).