Week 3

Protein Sources

Distillery and Brewery By-Products

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• Plant-based high protein feedstuffs
• Fed dried, wet, or ensiled
• Distillery by-products
• Distillation process
• Grains and water cooked
• Malt added – enzymatic degradation
• Yeast added - fermentation
• Alcohol removed via distillation
• Whole stillage
• Distillery by-products
• Distiller's dried grains
• Most common
• Figure 6.15 – Distiller's dried grains



• Others include condensed and dried distiller's solubles, distiller's dried grains with solubles, and distiller's dried yeast
• Named according to predominant grain
• Nutritional value
• Average of by-products – 27-29% CP (AF basis)
• Low in lysine and phenylalanine
• Solubles have better amino acid profile
• Moderate to high energy
• Grains have higher crude fiber content
• High in B-complex vitamins, P, S, and some microminerals
• Brewery by-products
• Brewing process
• Water added to barley – germination and enzymatic degradation
• Dried
• Grains, hops, and water added and cooked
• Separation of solids and liquids
• Liquid fermented
• Brewer's dried grains, brewer's dried malt sprouts, and brewer's dried yeast
• Others include brewer's dried spent hops and brewer's condensed solubles
• Nutritional value
• Grains and malt sprouts
• 26-29% CP (AF basis)
• Good quality
• Grains - limiting amino acid lysine
• Sprouts – limiting amino acid methionine
• High fiber
• Grains – 18-19%
• Sprouts – 14-16%
• Yeast
• 45% CP (AF basis)
• High in lysine, tryptophan, and B-complex vitamins
• Feeding livestock
• Distillery and brewery by-products more favorable for ruminants
• Grains
• Primarily fed to ruminants
• Rumen inert protein
• Condensed solubles and grains with solubles
• Ruminants
• Monogastrics in limited amounts
• Malt sprouts
• Ruminants
• Yeast
• Ruminants and monogastrics