TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: In the process (M1), the biomass comprises plant matter, animal matter, or municipal waste. Preferably the biomass comprises corn, wheat, rice, barley, soybeans, bamboo, cotton, crambe, jute, sorghum, high biomass sorghum, oats, tobacco, Miscanthus grass, switch grass, beans rape/canola, alfalfa, flax, sunflowers, safflowers, millet, rye, sugarcane, sugar beets, cocoa, tea, Brassica species, coffee, sweet potatoes, flax, peanuts, clover, lettuce, tomatoes, cucurbits, cassava, potatoes, carrots, radishes, peas, lentils, cabbages, cauliflower, broccoli, Brussels sprouts, grapes, peppers, pineapples, apples, pears, peaches, apricots, walnuts, almonds, olives, avocadoes, bananas, coconuts, orchids, carnations, roses, castor beans, jatropha, peels, pits, fermentation waste, skins, straw, seeds, shells, beancake, sawdust, wood flour, wood pulp, paper pulp, paper pulp waste streams, rice or oat hulls, bagasse, grass clippings, lumber, food leftovers, bone meal, hair, heads, tails, beaks, eyes, feathers, entrails, skin, shells, scales, meat trimmings, hooves, animal carcasses, milk, meat, fat, animal processing waste, animal waste, green algae, red algae, glaucophytes, cyanobacteria, slime molds, water molds, kelp, red macroalgae, sewage, garbage, food waste, waste paper, toilet paper, yard clippings, or cardboard (especially biomass is corn). The byproducts comprise whole stillage (WS), thin stillage (TS), wet distillers grain (WDG), distillers grain (DG), concentrated distillers solubles (CDS), syrup, or wet distillers grain with solubles (WDGS). The byproducts are carbonaceous byproducts lack starch. The byproducts comprise hemicelluloses or lignocellulose, preferably the byproducts comprise 5-6C oligosaccharides.    TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Process: In the process (M1), the byproducts are optionally pretreated prior to the mixing step. The pretreatment involves acid hydrolysis, dilute acid hydrolysis, alkaline hydrolysis, autohydrolysis, or steam explosion (preferably autohydrolysis or steam explosion). The pretreatment involves dilute acid hydrolysis. The process further involves producing at least one fermentation byproduct from the fermentation of the byproducts of biomass processing by the mesophilic microorganism. The fermentation byproducts comprise higher protein distillers grains (HPDG). The fermentation byproducts are concentrated to produce an animal feed product. The animal feed product is treated to destroy any residual microorganisms. The fermentation end product is an alcohol (preferably ethanol). The process (M1) involves: steps (a); (b1) fractionating at least one byproduct to form a fiber-rich stream, an oil-rich stream, and/or a protein-rich stream; (c1) mixing the fiber-rich stream and any unfractionated byproduct with the mesophilic microorganism, in the fiber-rich stream and any unfractionated byproduct; and (d1) fermenting the fiber-rich stream and any unfractionated byproduct of biomass processing for to allow the mesophilic microorganism to produce the fermentation end product from the fiber-rich stream and any unfractionated byproduct. The pretreatment comprises dilute acid hydrolysis. The germ-rich stream is mixed with the fiber-rich stream. The germ-rich stream is pretreated to remove fats and/or oils. Preferred Microorganism: The mesophilic microorganism is a Gram-positive bacterium, preferably a strain of Clostridium, C. phytofermentans, Clostridium sp. Q.D., or C. phytofermentans (American Type Culture Collection 700394T or a strain assigned the NRRL deposit accession number NRRL B-50361, NRRL B-50362, NRRL B-50363, NRRL B-50364, NRRL B-50436, NRRL B-50437, NRRL B-50351, NRRL B-50352, NRRL B-50353, NRRL B-50354, NRRL B-50355, NRRL B-50356, NRRL B-50357, NRRL B-50358, NRRL B-50359, or NRRL B-50498). The strain is a C. phytofermentans (ISDgT). The strain is genetically modified. Preferred System: The system (S1) for the production of a fermentation end product and an animal feed product from a fiber-rich stream, comprising a CBP plant that comprises: (i) a fiber storage system, (ii) the fiber-rich stream from a host plant that processes biomass, (iii) the mesophilic microorganism, (iv) a fermentation vessel, (v) a beer well, (vi) a distillation column, (vii) a centrifuge, and (viii) dryers. In the system, the CBP plant further comprises a pretreatment reactor. EXAMPLE - No suitable example given.