that sort of sh!t is really popular around here for many reasons (mainly money),there is a joke about it going around:
what is the difference between dog food and canned meat? from dog food,your hair is going to be smooth and silky,cause dog food has vitamins added

they use all sort of trash-skins,giblets,they mix all that stuff together with lot of fat,water and some nice chemicals that will hold that sh!it together and remove that ugly grey color and presto,you can have some nice chunk of cheap meat..and it gets worse too,they are starting to replace fat with more water (and chemicals).fat is getting expensive these days