Abstract
The nutritive value of barley-derived distillers dried grains (BDDG) and distillers dried grains with solubles (BDDGS) was assessed in digestibility and in sacco rumen degradability experiments. The crude protein contents of BDDG and BDDGS were 26.4 % and 29.9 %, and the crude fibre contents 19.9 % and 17.4 % in DM, respectively. The ADF and NDF contents averaged 33 % and 67 % and the lignin 7.6 % of DM. The digestibilities of the nutrients were measured with four rams in both trials and the distillers by-products were given at two levels, 33 % and 66 %, in hay-based rations. The digestibilities in BDDG and BDDGS were, respectively, 43.1 % and 47.7 % for organic matter, 64.5 % and 66.5 % for crude protein, and 86.7 % and 87.9 % for ether extract. Due to the low digestibilities, the energy values of the two products were low, 0.58 FU/kg DM and 8.0 MJ/kg for both, and DCP/FU 295g for BDDG and 347 g for BDDGS. The rumen degradability of the crude protein of BDDG and BDDGS was found to be low and significantly lower than the degradability of wheat distillery by-products (P < 0.05). Fine grinding gave more rapid degradability. Due to the low total digestibility and reduced lysine content, BDDG and BDDGS may have limited protein availability when given as supplements.
Highlights
The nutritive value of barley-derived distillers dried grains (BDDG) and distillers dried grains with solubles (BDDGS) was assessed in digestibility and in sacco rumen degradability experiments
Barley is the main raw material in the integrated starch-ethanol production planned to start in 1987 in Finland, with an expected of 61700 tn dry matter (DM) feedstuff annual yield (Lehmussaari 1984)
The dry matter contents were determined by oven heating at 103 °C and samples for feed analysis were dried in a vacuum oven at 50 °C
Summary
Barley-derived distillers dried grains (BDDG) and distillers dried grains with solubles (BDDGS) were obtained from OY Alko AB’s Koskenkorva factory. From the whole barley stillage, the residues from the distillation process, the coarse grains were separated and dried to produce BDDG and the solubles were condensed by evaporating to produce BDDGS together with dried distillers grains. Samples of the experimental feeds were taken for every period. The dry matter contents were determined by oven heating at 103 °C and samples for feed analysis were dried in a vacuum oven at 50 °C. In sacco rumen degradability of barley and wheat distillery by-products was determined in a nylon bag (porosity 40 /*m) as described by Setälä (1983). Effective protein degradability was calculated using a 0.04 dilution rate from the rumen according to the equation of Kristensen et al (1982)
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