Feeding high concentrations of corn dried distillers’ grains decreases methane, but increases nitrous oxide emissions from beef cattle production

摘要: Abstract Previous research has shown that feeding high fat corn distiller’ grains plus solubles (CDDGS; ∼10% fat, dry matter [DM]) reduces enteric methane (CH4) emission from beef cattle. However, CDDGS (∼30% crude protein [CP] DM) or wheat distillers’ (WDDGS; ∼40% CP, increases N excretion cattle and the resulting increase in nitrous oxide (N2O) manure may offset any CH4 mediated decrease greenhouse gas emissions (GHG). The objective of this study was to evaluate impact WDDGS inclusion on GHG using a life cycle assessment (LCA). LCA conducted primary data for diet composition, generated two studies growing finishing A representative model farm simulated Holos (www.agr.gc.ca/holos-ghg), which included 40% DM feedlot diets. simulation made relative standard practice barley grain as main supplemental energy source western Canadian diets (baseline scenario). Feeding (14.98 kg CO2 equivalent [CO2e]/kg live weight) (15.41 kg CO2e/kg resulted 6.2 9.3% higher intensity compared baseline scenario (14.10 kg weight). Using high-fat emissions, but at dietary levels it results net emissions. To reduce environmental impact, dried should not be level exceeds requirements. Manure arising fed DDGS land applied matches requirements crop.