Research: Substituting barley with wheat-DDGS in beef diets
Canadian research investigated the substitution of wheat dried distillers grains with solubles for barley silage and barley grain in a finishing diet increases polyunsaturated fatty acids including linoleic and alpha-linolenic acids in beef.
Wheat dried distillers grain with solubles (WDDGS) contain low levels of starch, but are high in protein and fibre and have been used as a substitute for barley grain in commercial Western Canadian finishing diets for beef cattle.
This study investigated effects of WDDGS on fatty acid profiles of meat when it was substituted for barley silage in a barley grain finishing diet.
Trial setup
Steers (n = 240; 489 ± 30.0 kg) were fed one of four finishing diets over a 12 week period:
Diets type | Barley grain plus additives | Barley silage | WDDGS |
CON | 85% | 15% | 0% |
WDDG25 | 65% | 10% | 25% |
WDDG30 | 65% | 5% | 30% |
WDDG35 | 65% | 0% | 35% |
Results
Substitution of WDDGS for barley silage increased concentrations of total polyunsaturated fatty acids (PUFA), including linoleic acid and alpha-linolenic acid (ALA) in pars costalis diaphragmatis muscle without affecting major trans fatty acids.
Replacement of 100 and 150 g silage with 200 g of barley grain/kg feed DM with WDDGS increased ALA, from 0.32 g in CON to 0.40 and 0.41 g/kg of total fatty acids in WDDG30 and WDDG35, respectively.
Conclusion
The results suggest that replacement of barley silage with up to 350 g WDDGS/kg DM increases total PUFA and omega-3 fatty acids in beef.
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