The nutritive value of industrial by-products for poultry

Authors

• Tuomo Kiiskinen Agricultural Research Centre of Finland, Institute of Animal Production, SF-31600 Jokioinen, Finland

DOI: https://doi.org/10.23986/afsci.72439

Abstract

The metabolizable energy (ME) and partly also the digestibility of several industrial by-products, mainly originating from grain, were determined in trials with adult cockerels. Five experiments were performed using a conventional total collection procedure, and test ingredients were substituted for 25-40 % of the basal diet. The nitrogen-corrected apparent (AMEn) and true (TMEn) metabolizable energy values of distillers’ dried grains (DDG) and distillers’ dried grains with solubles (DDGS) derived from barley, wheat and rye varied from 7.85 to 11.8 and from 7.98 to 12.0 MJ/ kg DM, respectively. The highest MEn values were observed in the dehulled barley-derived products. The digestibility of crude protein (CP) was 62-83 and that of carbohydrates 25-50 %, the latter being lowest for feeds originating from whole barley grain. The results indicated that distillers’ feeds derived from dehulled grain, especially barley, are satisfactory energy sources for poultry diets. Dried barley protein (BP 1, CP 38 %), oats protein (CP 44 %) and distillers’ solids (CP 58 %) from the integrated ethanol starch process, as well as dehulled barley and oats proved to be excellent energy feeds containing AMEn 14.9, 18.6, 15.0, 14.2 and 14.6 MJ/kg DM, respectively. The TMEn values for BPI and dehulled grains were 15.3, 14.4 and 14.8 MJ/kg DM. Supplementation with enzymes did not significantly improve the ME value of dehulled barley. The AMEn values for barley protein (BP2, CP 27 %), barley bran and barley molasses obtained from the starch process, and wheat feed meal from the milling industry, were 13.3, 8.52, 13.5 and 10.6 MJ/kg DM, respectively. The lowest ME values were obtained for samples of wheat bran, dried potato pulp and malt sprouts: AMEn 6.09, 6.23 and 6.01; TMEn 6.15, 6.07 and 6.01 MJ/kg DM, respectively.