Since approximately the turn of the 20th century the scheme most commonly used by animal nutritionists on the North American continent to describe quantitatively the useful or available energy of a feeding stuff to an animal has been that of Total Digestible Nutrients (TDN). The calculation of a TDN value involves the following steps: l) fractionation of a dry feed by the Weende analysis into crude protein, ether extract, carbohydrate and ash, of which all but ash are potential energy sources; 2) the application of appropriate digestion coefficients to determine digestible nutrients; 3) and finally a weighting of the digestible nutrients by a scheme of metabolizable calories developed simultaneously by Hills and associates, and by Woll and Humphrey (Maynard, 1953).
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.110251 |
| Date | January 1956 |
| Creators | MacKay, Vernon. G. |
| Contributors | Crampton, E. (Supervisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science. (Department of Health Sciences.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: NNNNNNNNN, Theses scanned by McGill Library. |
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