Dried brewer’s spent grain

A complex of substances with nutritional value and biological activity.

Brewer’s grain is the material that is remaining after grains have been fermented during the beer making process. Brewer’s spent grains are considered to be good sources of un-degradable protein, fiber, energy and water-soluble vitamins, that is why they are often used as a livestock feed.

Spent brewery grains contain up to 20% protein dry weight and up to 60% fiber and are useful additions to animal feed. They have been used in feeding both ruminant and monogastric animals (monogastrics using predominantly the dried forms). The nutritional value of dried brewer’s spent grain is 0.8 to 0.82 oz.

Currently, the primary market for brewer’s spent grain is a dairy cattle feed. Feeding the cows with 15-20 kg of brewer’s grains per day increases the milk production by 8-12% without changing the fat amount, the taste and smell of milk. Dried brewers grains are an excellent source of high quality by-pass protein and digestible fiber that helps to improve the metabolism of dairy cattle. Dried brewers grains have a good amino acid, mineral and B-vitamin content. This feed ingredient is known for putting “milk in the pail”. Suggested feeding levels are 20-30% of the ration for dairy cows.

Protein in brewer’s grains can meet a significant portion of supplemental protein requirements. In addition, they provide fiber and needed bulk in the diets of ruminants and horses. Brewer’s grains and other brewers by-products have also been fed to pigs, sheep, rabbits, horses and fish.

Adding 11% of the nutritional value of dried brewer’s spent grains to the diet of pigs raises their daily weight gain by 8%. But pigs can digest the brewer’s spent grains only by 59%, and ruminants — by 68-73%. Digestion and absorption of nitrogen free extract (NFE) reaches 60%, fat — 88%, fiber only 40%.

By-product feed ingredients can provide an economical alternative to traditional grains and forages used in cattle operations. Replacement of the concentrate fertilizers with the brewer’s spent grain reduces the cost of animal feed without changing the quality of meet. Animal performance can be maintained and improved if brewery`s spent grains are used within nutrition and feed management guidelines.

(Brewers’ spent grain (BSG) is available in large quantities throughout the year, but its main application has been limited to animal feeding. Nevertheless, due to its high content of protein and fibre, it can also serve as an attractive adjunct in human nutrition.)

Chemical analysis of the nutritional value of the dried brewer’s spent grain 

Moisture

8,67

Crude protein

23,44

Crude fat

7,75

 Crude ash

2,5

Crude fiber

14,3

Nitrogen free extract (NFE)

43,44

Chemical elements

Calcium (Ca)

0,37

Phosphorus (P)

0,5

Manganese (Mn), mg/kg

52

Zinc (Zn), mg/kg

105

Iron (Fe), mg/kg

205

Copper (Cu), mg/kg

15

Amino Acids

Lysine (K)

0,86

Histidine

0,66

Arginine

1,07

Aspartic acid

1,35

Threonine (Thr or T)

0,77

Serine

0,89

Glutamic acid

4,57

Proline

2,05

Glycine

0,79

Alanine (Ala or A)

0,94

Cystine

0,46

Valine

1,06

Methionine

0,5

Isoleucine (I)

0,79

Leucine (L)

0,57

Tyrosine

0,61

Phenylalanine

1,23

Total Amino Acids

19,17

Including essential (indispensable) amino acids

7,51