In vitro and in situ investigations on protein and energy value of distillers dried grains with solubles
- Publication Type
- Contribution to conference
- Authors
- Steingass H, Westreicher-Kristen E und Rodehutscord M
- Year of publication
- 2012
- Published in
- 21. International Scientific Symposium on Nutrition of Farm Animals
- Series/labeling
- International Scientific Symposium on Nutrition of Farm Animals
- ISBN / ISSN / eISSN
- 978-961-90951-8-8
- Page (from - to)
- 11-15
- Conference name
- Zadravec-Erjavec Days 2012
- Conference location
- Radenci (Slowenien)
- Conference date
- 8.-9. November 2012
- Keywords
- chemical composition, Getreide, Hohenheimer Futterwerttest, Hohenheim gas test, in situ-Methode, Proteinbewertung
The present study aimed to quantify the variation of chemical composition and protein- and energy values of distillers dried grains with solubles (DDGS). 13 DDGS samples from eight European ethanol plants originating from wheat (n=5), corn (n=3), barley (n=1) and blends (n=4) were investigated. Ruminal crude protein degradation was studies with an in situ method. In addition, the content of utilisable crude protein (nXP) as well as the content of Metabolisable Energy (ME) and Net Energy for Lactation (NEL) was predicted using Hohenheim gas test method.
Chemical composition varied widely among samples (g/kg DM ± SD): 310 ± 33 crude protein (XP), 86 ± 37 ether extract, 408 ± 39 aNDFOM, 151 ± 39 ADFOM, 62 ± 31 ADL. In situ soluble protein fraction (a) varied between 10 and 31 %, potential degradable fraction (b) was between 57 and 83 % and rate of degradation varied from 3 to 267 %/h. Calculated for a rumen outflow rate of 8 %/h, DDGS from corn had the highest content of undegradable crude protein (UDP) (60 ± 2 %) followed by wheat DDGS (41 ± 13 %), blends (25 ± 12 %) and barley (20 %). Mean nXP content estimated in vitro was 285 ± 28 g/kg DM, mean ME content was 12.4 ± 0.6 MJ/kg DM.
Generally, good protein and energy values could be confirmed for DDGS. However, the large variation of values complicate an appropriate formulation of rations and compound feeds as it is not possible to predict UDP values from simple chemical constituents with satisfying accuracy.