DIP is the abbreviation for "degradable intake protein,' which is the proportion of the total crude protein in a feedstuff that is degraded in the rumen. This fraction is typically used by rumen microbes to build their own protein, which is a high quality protein and is later digested by the animal in the small intestine. This is the primary source of protein for most ruminants. UIP is the abbreviation for “undegradable intake protein," which is the fraction of protein in a feedstuff that is not degraded in the rumen, but remains intact to be digested by the animal in the small intestine.

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