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Skip to Search Results- 1Durunna, Obioha Nnamdi
- 1Goldansaz, Seyed Ali
- 1Hashemiranjbar Sharifabad, Mohsen
- 1Jiu, Zhiqiang
- 1Kong, Rebecca
- 1Lansink, Nicky
- 1Alexander, Trevor (AAFC)
- 1Bork, Edward (Agricultural, Food, and Nutritional Science)
- 1Dr. Changxi Li (Agricultural, Food & Nutritional Science)
- 1Dr. Leluo Guan (Agricultural, Food, and Nutritional Science)
- 1Graham, Plastow (Agricultural, Food, and Nutritional Science)
- 1Guan, Leluo (Agricultural, Food, and Nutritional Science)
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Performance and Methane Emissions of RFI Selected Cattle in Drylot and Under Open Range Conditions
DownloadSpring 2018
Residual feed intake (RFI) is a moderately heritable trait that can be used to measure feed efficiency in beef cattle, and thereby reduce feed related costs. RFI has been primarily evaluated under drylot conditions where diet, feed intake and activity levels are controlled and foraging behaviour...
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Genetics of feed efficiency and feeding behavior in crossbred beef steers with emphasis on genotype-by-environment interactions
DownloadFall 2011
This study examined whether crossbred steers had different production, feed efficiency and feeding behavior performances when they were fed a grower or finisher diet or both, in successive feeding periods. Major feed efficiency traits were residual feed intake (RFI) and gain to feed ratio (G:F)...
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Effects of Selection for Low Residual Feed Intake on Meat Quality of Major Muscles from Angus, Charolais and Kinsella Composite Cattle
DownloadFall 2017
Residual feed intake (RFI) is a measure of animal feeding efficiency. Selection of high feed efficient cattle using RFI does not affect production performance; low RFI animals consume less feed to reach a similar body weight gain as high RFI animals and thus are considered as feed efficient...
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Spring 2021
Hashemiranjbar Sharifabad, Mohsen
Feed represents more than half of the costs of livestock production. Residual feed intake (RFI) is a phenotypic measure of feed efficiency that has been proposed as the best approach for genetic improvement of dairy cows. Although RFI is considered as a useful tool for feed efficiency, the...
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Application of Multi-Omics Tools to Study the Genetic Background of Economically Relevant Traits in Commercial Beef Production
DownloadSpring 2022
The sustainability and profitability of beef cattle production are largely associated with feed efficiency, carcass merit, and resistance to infectious diseases. These traits are difficult or expensive to measure on individual animals, which makes them suitable for genomic application. Currently...
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Patterns of Genomic Variation and Whole Genome Association Studies of Economically Important Traits in Cattle
DownloadFall 2012
Functionally important genetic variations in cattle have great potential as tools to increase agricultural production once they are identified through association studies of phenotype and genotype. The objectives of this thesis were: 1) to characterize the genome-wide patterns of linkage...
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Novel feed enzyme delivery method: Binding exogenous feed enzymes to Bacillus spores to improve enzyme stability and total tract digestibility
DownloadFall 2018
The effects of binding feed enzymes to Bacillus subtilis (strain RK28) spores on enzyme stability and digestion in cattle were studied in comparison to unbound enzymes. Optimal conditions for adsorbing six different enzymes (α-amylase, β-glucanase, feruloyl esterase, phytase, purified xylanase,...
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Assessment of rumen microbiota in beef heifers with different feed efficiency and managed under different feeding systems
DownloadSpring 2020
The linkage between rumen microbiota and feed efficiency has been studied in cattle managed under the drylot system, especially in the feedlot with high-grain diets. However, pasture-based beef operations still dominate the beef production system around the world. In Alberta and other provinces...
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Contribution of the Rumen Epithelial Transcriptome and Microbial Community to Variation in Beef Cattle Feed Efficiency
DownloadSpring 2016
Feed efficient cattle consume less feed and produce less environmental waste than inefficient cattle. Many factors are known to contribute to differences in feed efficiency. However, it is unknown how the rumen epithelium and its associated microorganisms influence the feed efficiency of cattle....
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Identification of functional genes for feed efficiency traits via transcriptome analyses to enhance the genomic prediction accuracy in beef cattle
DownloadFall 2019
Residual feed intake (RFI), a measure of feed efficiency, and its component traits including average daily gain (ADG), dry matter intake (DMI) and metabolic weight (MWT) are traits of great economic importance to the beef industry. The genetic improvement of these traits can improve the...