The Intergovernmental Panel on Climate Change, Tier 2 methodology and 16 empirical models together with dietary information were used to estimate daily methane (CH4) production and Ym (CH4 energy expressed as a percentage of gross energy intake) for mature cows (lactating and dry) and growing steers (backgrounding, grazing, and finishing) in eastern and western Canada. Monthly simulations accounted for changes in body weight, feed intake, and diet composition. Coefficient of variation (CV) and uncertainty (95% confidence interval divided by mean) were used to estimate variability. Estimates of CH4 (g d−1) and Ym from models differed from IPCC estimates. For models, the CV of Ym ranged from 0.8% to 29.7% and uncertainty from 0.9% to 45.2% over the production phases of the animals in contrast to the fixed Ym used by IPCC. When information on diet composition is lacking, a Ym value of 7.0%–7.3% can be used for beef cows depending on stage and location, and 6.4%–6.6% for growing cattle fed high-forage diets, whereas 4.8% is recommended for finishing diets instead of the default values of 6.5% for high-forage diets and 3.0% for finishing diets typically used in the IPCC Tier 2 method.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.