Bigredtruckmi,
You are correct but you need to remember that there are two important parts of the feed value of any feed. First is the nurtrients supplied, protein, minerals, vitamins, etc. and the second is the energy. Without a source of energy any organism, cow, pig, human or bacterium cannot metabolize the other nurtritional elements into tissues, cells or even maintain itself. For example feed analysis labs report the energy value for every feed analysis in megacals per lbs and these energy valves differ depending on whether you are feeding for growth (Eg), lactation(El) (milk production) or just maintainance (Em). The problem is that the distillers grains is an excellent source of protein but most of the energy has been removed. This lack of energy will dramatically change the economics of cattle feeding in feedlots, and broiler and hog production. Whereas previously livestock farmers had excess energy and limited protein now they will have more protein than can be efficently used than the energy to use it.