If the bloat is serious and the animal’s life is in immediate danger, a rumenotomy may be performed if trochars and cannulas are not available or if they fail to relieve the pressure. A sharp knife may be used to make an incision in the left flank of the animal, below the last rib and in line with the point of the hip. Aim the incision towards the brisket, aiming for the centre of the rumen. The hole should be 4 to 6 inches long. Be careful to avoid the spleen and reticulum, which are located directly behind the rumen.
Once the rumen has been punctured, any excess gas and fluids should be able to escape. This will relieve the bloat and the animal should be able to breathe more easily. The hole will usually heal on its own, but it may be necessary to stitch it up if it does not.
After the procedure, it is important to monitor the animal closely and provide it with plenty of fresh water and feed. It is also important to keep the area clean and dry to prevent infection.