Global ETD Search

1	Milk production of beef cattle and performance of their calves Frerichs, William Theodore, 1946- January 1973 (has links) No description available. Milk yield. Hereford cattle -- Feeding and feeds. Brown Swiss cattle -- Feeding and feeds.
2	Partial purification and characterization of selected enzymes of bovine nitrogen metabolism : comparison of the Nguni and Hereford breeds Mathomu, Lutendo Michael 11 1900 (has links) Ruminant animals consuming low N-diet have been reported to have increased urea reabsorption with the Nguni being categorized as N-recycling ruminant. The enzymes associated with N-cycling are hypothesized to contribute to survival of the Nguni in harsh conditions. Enzymes responsible for such a function needed to be characterized in order to determine their effect in the functioning of the Nguni as opposed to Hereford breed. Crude enzymes from both breeds were separated from most or some contaminants by sephadex G-25, DEAE sephacel, and different affinity column chromatography. CPS and GDH were successfully purified and characterized by LC-MS/MS and further analysed by ProteinPilot™, blasted and matched >95% with those of Bos Taurus. Comparison of characterized enzymes and those which failed to ionise such as ARG, GS and GA was done using kinetics and graphs annotating specific activities. Partial purification and characterization was in part achieved. / Life & Consumer Sciences / M. Sc. (Life Sciences) Cattle breeds Purification Characterization Nitrogen metabolism Arginase Carbamoyl phosphate synthetase Glutamine synthetase Glutamate dehydrogenase Glutaminase Chromatography Rate of maximal velocity Enzyme activity Kinetics 636.208521 Nguni cattle -- Feeding and feeds Nitrogen -- Metabolism Hereford cattle -- Feeding and feeds
3	Partial purification and characterization of selected enzymes of bovine nitrogen metabolism : comparison of the Nguni and Hereford breeds Mathomu, Lutendo Michael 11 1900 (has links) Ruminant animals consuming low N-diet have been reported to have increased urea reabsorption with the Nguni being categorized as N-recycling ruminant. The enzymes associated with N-cycling are hypothesized to contribute to survival of the Nguni in harsh conditions. Enzymes responsible for such a function needed to be characterized in order to determine their effect in the functioning of the Nguni as opposed to Hereford breed. Crude enzymes from both breeds were separated from most or some contaminants by sephadex G-25, DEAE sephacel, and different affinity column chromatography. CPS and GDH were successfully purified and characterized by LC-MS/MS and further analysed by ProteinPilot™, blasted and matched >95% with those of Bos Taurus. Comparison of characterized enzymes and those which failed to ionise such as ARG, GS and GA was done using kinetics and graphs annotating specific activities. Partial purification and characterization was in part achieved. / Life and Consumer Sciences / M. Sc. (Life Sciences) Cattle breeds Purification Characterization Nitrogen metabolism Arginase Carbamoyl phosphate synthetase Glutamine synthetase Glutamate dehydrogenase Glutaminase Chromatography Rate of maximal velocity Enzyme activity Kinetics 636.208521 Nguni cattle -- Feeding and feeds Nitrogen -- Metabolism Hereford cattle -- Feeding and feeds

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