Impact of cold acclimatization on nutrient utilization and enteric methane emissions of beef cows overwintered on low-quality forage diets supplemented with dried distillers grain with solubles

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dc.contributor.authorBernier, Jennilee
dc.contributor.examiningcommitteePlaizier, Kees (Animal Science) Campbell, Kevin (Biological Sciences)en_US
dc.contributor.supervisorOminski, Kim (Animal Science) Wittenberg, Karin (Animal Science)en_US
dc.date.accessioned2011-09-21T18:17:09Z
dc.date.available2011-09-21T18:17:09Z
dc.date.issued2011-09-21
dc.degree.disciplineAnimal Scienceen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractThis study was conducted to determine if nutrient utilization and enteric methane (CH4) emissions could be improved in overwintering beef cows consuming low-quality forage supplemented with protein in the form of dried distillers grain with solubles (DDGS) in thermal-neutral and cold-stressed environments. Thirty mature, dry and non-pregnant beef cows were divided into three treatment groups and fed diets consisting of low-quality (6.0% crude protein; CP) forage with no DDGS (control, CON), 10% DDGS (borderline sufficient CP, 8.7% CP), or 20% DDGS (excess CP, 11.6% CP). Cold acclimatization did not appear to affect nutrient intake and digestibility by beef cows, but increased N and P excretion by 1.2x and 2.5x, respectively. Cold acclimatized cows reduced energy excretion by 26.8% (7.1 vs. 5.2 ± 0.30% GEI in fall and winter, respectively; P < 0.0001) in accordance with a 33.8% increase in rumen fluid rate of passage (ROP). Supplementation with DDGS improved digestibility of N and P (40.6 vs. 61.2 ± 2.45% N and -23.9 vs. 5.7 ± 5.95% P for CON and 20%DDGS, respectively; P < 0.0001) by increasing digestible substrate in the diet. Protein supplementation increased rumen NH3-N concentrations (1.5, 2.1 and 3.1 ± 0.15 mg 100 mL-1; P < 0.0001) enough to increase rumen fermentation efficiency, resulting in 18.5% lower enteric CH4 emissions when CP was fed in excess of animal requirements. Total excretion of N and P were increased two- and 45-fold, respectively, when excess CP was fed. Reduced enteric CH4 emissions as a result of cold acclimatization suggest an advantage for the Canadian beef herd in terms of environmental sustainability. Supplementing CP in excess of cow requirements may improve nutrient utilization and rumen fermentation efficiency, and mitigate enteric CH4 emissions in beef cows fed low-quality forage diets, but may also contribute to greater N and P loading of soil and ground water.en_US
dc.description.noteOctober 2011en_US
dc.identifier.urihttp://hdl.handle.net/1993/4938
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectdried distillers grain with solublesen_US
dc.subjectwheat-based DDGSen_US
dc.subjectlow-quality forageen_US
dc.subjectnutrient utilizationen_US
dc.subjectproteinen_US
dc.subjectnitrogenen_US
dc.subjectphosphorusen_US
dc.subjectdigestibilityen_US
dc.subjectfermentation efficiencyen_US
dc.subjectnutrient excretionen_US
dc.subjectcold acclimatizationen_US
dc.subjectthermal-neutralen_US
dc.subjectcold-stresseden_US
dc.subjectmethaneen_US
dc.subjectbeef cowen_US
dc.titleImpact of cold acclimatization on nutrient utilization and enteric methane emissions of beef cows overwintered on low-quality forage diets supplemented with dried distillers grain with solublesen_US
dc.typemaster thesisen_US
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