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Associations between rumen function and feed efficiency in beef cattle

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dc.contributor.advisor Cant, John Lam, Stephanie Munro, Jasper Cant, John Guan, Leluo Steele, Michael Schenkel, Flavio Miller, Stephen Montanholi, Yuri 2016-09-08T16:10:05Z 2016-09-08T16:10:05Z 2016-09 2016-07-26 2016-09-08
dc.description.abstract Rumen functional and structural parameters and their associations with feed efficiency were evaluated. Forty-eight crossbred feedlot cattle were assessed for feed efficiency using residual feed intake (RFI) adjusted for body ultrasound measurements. Rumen fluid and tissue samples were evaluated for microbial and VFA profiles, papillae histomorphometry, and rumen pH (RpH) and temperature (RT) and compared between efficient and inefficient cattle. Additionally, microbial and VFA profiles were compared on-farm and at slaughter. Efficient cattle have greater bacteria (P=0.04), lower methanogen concentrations (P=0.04), differences in multiple VFA (P<0.05) between on-farm and at slaughter, greater ventral blind sac papillae width (P=0.02), spend more daily time in optimal RpH (P=0.02) and have lower circadian RpH compared to inefficient cattle. Differences in VFA profiles or RT traits were not found across efficiency groups. This suggests rumen structural and functional parameters influence the efficiency of feed utilization and may serve as potential indicators for feed efficiency. en_US
dc.description.sponsorship Beef Cattle Research Council, Agriculture and Agri-food Canada, Agriculture Adaptation Council, Beef Farmers of Ontario, and Ontario Ministry of Agriculture, Food, and Rural Affairs. en_US
dc.language.iso en en_US
dc.subject Histomorphometry en_US
dc.subject Microbiology en_US
dc.subject Residual feed intake en_US
dc.subject Rumen pH en_US
dc.subject Volatile fatty acids en_US
dc.title Associations between rumen function and feed efficiency in beef cattle en_US
dc.type Thesis en_US Animal and Poultry Science en_US Master of Science en_US Department of Animal Biosciences en_US
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