Why are organs important?

Over on Dogster, someone asked the question as to why organs are necessary for a raw diet, I've never really known the answer to that other than they need nutrients from them, & it helps balance out the diet.  So I did some research and this is what I found:

Liver
In this one product is a vast range of important nutrition. Liver is the most concentrated source of vitamin A and should be fed in small amounts on a regular basis. It also contains vitamins D, E, and K in substantial quantities. Liver is an excellent source of the minerals zinc, manganese, selenium and iron. It also contains all the B vitamins, particularly B2, B3, B5, biotin, folacin, B12, choline, and inositol. It contains B1 in adequate or smaller amounts and is a good source of vitamin C. Liver provides a source of good quality protein and the essential fatty acids, both the omega-3 and omega-6 type.

Kidneys
Not unlike liver, kidney supplies good quality protein, essential fatty acids and many vitamins including all the fat soluble vitamins A, D, E and K. Kidneys are a rich source of iron and all the B vitamins. They also have good levels of zinc.

So even if your dog is having a harder time adjusting with organs, they are still a good idea to give, otherwise you'd have to supplement with tons of vitamins etc.  We have found that with Georgie he needs a bone meal before, during & after all organ meals, Zoey only needs the bone meal with her organs.  Shellie also needs the bone meals, before, during & after her organs.  Each dog is different but that helps eliminate the splarts/rocket butt etc.