Measured and modelled enteric methane emissions from beef cattle as affected by dietary crude protein of forage diets
| dc.contributor.author | Blair, Kristine | |
| dc.contributor.examiningcommittee | McGeough, Emma (Animal Science), Amiro, Brian (Soil Science) | en_US |
| dc.contributor.supervisor | Ominski, Kim (Animal Science) Wittenberg, Karin (Animal Science) | en_US |
| dc.date.accessioned | 2015-10-07T14:57:54Z | |
| dc.date.available | 2015-10-07T14:57:54Z | |
| dc.date.issued | 2015 | |
| dc.degree.discipline | Animal Science | en_US |
| dc.degree.level | Master of Science (M.Sc.) | en_US |
| dc.description.abstract | Methane emissions of 60 steers (321 ± 14 kg) fed isocaloric forage diets differing in crude protein (CP) content were measured at ambient daily temperatures averaging -17.5°C to determine if increased nitrogen status, measured by blood urea nitrogen (BUN), decrease CH4 as a percent of gross energy intake (% GEI) from backgrounding cattle. Average BUN concentrations (mmol L-1) were 0.81, 1.82, 3.05 and 3.51 (SE ± 0.108) for diets with 6.9% (low), 10.3% (adequate for rumen microbes), 11.1% (adequate for muscle growth) and 13.6% (excessive) CP respectively. Methane (% GEI) emissions decreased with increasing CP over time (P=0.04). Increasing CP content increased BUN levels and decreased methane emissions (% GEI). Although models were developed to predict CH4 emissions (% GEI) from steers and cows using a backward-elimination process, BUN accounted for only 0.7 to 5.7% of the partial R2 and therefore has limited value when modelling methane emission predictions. | en_US |
| dc.description.note | February 2016 | en_US |
| dc.identifier.uri | http://hdl.handle.net/1993/30870 | |
| dc.language.iso | eng | en_US |
| dc.rights | open access | en_US |
| dc.subject | Crude protein, Forage, Cattle, BUN, Cold | en_US |
| dc.title | Measured and modelled enteric methane emissions from beef cattle as affected by dietary crude protein of forage diets | en_US |
| dc.type | master thesis | en_US |
| local.subject.manitoba | yes | en_US |