Your information seems very similar to that of Wikipedia.

Conflicting information here then, from a Dog food website.
Why is Tripe A Superfood for Dogs?Tripe is very healthy for your dog as it is rich in many natural nutrients such as omega 3 & 6 fatty acids, enzymes and probiotics which are essential for your dog's wellbeing. Also present within the tripe are naturally occurring gastric juices and amino acids from the animals digestive process. Gastric juices are an excellent cleaner for your dog's teeth. Amino acids are necessary for proper muscular development.
It is also an excellent source of protein, and fibre and delivers near optimum calcium to phosphorus ratio which is essential for healthy bone and joint development.
Tripe can be classed as a "white meat" and has historically been fed to dogs with sensitive digestive tracts, or food allergies. There are many nutritional benefits in feeding your dog Tripe.
Tripe has a high bioavailability of many essential nutrients to keep your dog in peak condition. Benefits to the dog include noticeably better coats, more lustre and shine, healthy skin, richer colour etc. This is due to the presence of important and essential fatty acids like linoleic and linolenic acids. Tripe retains an "attractive" odour that dogs simply love and it is easily digestible it can be used as an appetite stimulator in cases where dogs refuse to eat their meals due to this high palatability and "attractive" odour to dogs.