Little starch is present in these products because it has been utilized in the fermentation process. What is left is mostly protein and fiber. Brewers grains are similar to corn silage in energy content. Corn gluten feed is a byproduct of corn syrup manufacturing. This feed has protein that is mostly degradable in the rumen and is not considered a source of rumen resistant protein.
Energy is similar to some grains.
Corn gluten feed is often an economical feed to use in rations. Citrus pulp is a source of digestible fiber and adds bulk to rations. Also, it can replace a portion of the forage fiber, but is relatively low in protein. When combinations of these feeds are used it becomes unclear as to what the maximums should be. With certain feeds this can be excessive.