Abstract
A new process for the integrated production of ethanol and starch yields barley fractions with different types and contents of carbohydrates and protein. The barley hulls and bran consist mainly of lignocellulose, the barley molasses has considerable contents of sugars and soluble protein, the barley protein contains 40 % protein and has a low fibre level, while the barley fibre consists mainly of cereal cell walls and its NDF is high. The amino acid content of the barley fractions is almost the same as in the barley raw material. The nutritive value of the barley fractions was assessed in six digestibility trials performed with rams. Barley protein and barley molasses had high digestibilities, 90—95 % for OM and 87—93 % for CP; barley fibre had slightly lower digestibilities, 73 % for OM and 77 for CP, while barley hulls and bran had low values, 58 % for OM and 64 % for CP. The nitrogen balance improved with increasing level of the barley fractions in hay diet. The FU values were 1.15,0.94, 0.97, 0.73, 0.30 and 0.93 per kg DM for barley protein, fibre, molasses, hulls +bran, hulls and a mixture of fibre and molasses, respectively. The present experiments indicated that, apart from the product of the dehulling process, the barley fractions obtained are of high nutritive value.
Highlights
Conventional distillers’ feeds are products resulting from the yeast fermentation of whole cereal grains
Starch and ethanol production from grains are in many respects very similar processes. Both utilize the starch and leave the other components of the raw material to be recovered as by-products for animal feed purposes
As most of the feed fractions have already been removed in the starch production, the amount of nonfermentables is very small compared with that in the conventional alcohol process
Summary
Conventional distillers’ feeds are products resulting from the yeast fermentation of whole cereal grains. Attractive for large plants, is initial wet milling of the grain, followed by separating out of starch, protein and fibre, to obtain various feed products. Barley distillers’ feeds from the traditional ethanol process have been found to have a relatively low nutritive value, due to their denatured protein and high fibre content (Näsi 1984).
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