The present invention is based on the discovery that moist heat treated ruminant animal feed compositions comprising a fermentation biomass, have increased amounts of proteinaceous matter that escapes fermentation within the rumen. The ruminant animal feed compositions may further comprise, alone or in combination, one or more of an isolated enzyme, an organic acid, a gluten protein, at least one divalent metal ion and at least one plant extract. The proteinaceous matter may then be digested or metabolized in the post-rumen portions of the ruminant digestive system, thereby providing further increased energy and protein levels for ruminant animals during times of increased productivity. Compositions and methods of manufacture of the compositions of the embodiments of the present disclosure are disclosed.