Timothy (Phleum pratense L.) was elevated in 1988 and 1989 at four locations of differing latitude in southern and northern Quebec and northeastern Ontario to determine whether latitude influences nutritional quality. Three cultivars of timothy (Salvo, Champ and Bounty) were evaluated at various growth stages. The following quality components were examined: neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), hemicellulose (HEM), crude protein (CP), and in vitro dry matter digestibility. Differences in quality among the locations were measured for the growth stages that were common to all sites. The rate of change in quality with advancing phenological development was also examined to determine differences among locations. The results indicated that there were significant differences in quality among the locations. Although quality was not consistently better for either the northern or southern locations, it showed a tendency to be superior at the southern locations. Locations with the highest dry matter yields were also observed to have inferior forage quality. The rate of change in quality at the locations was not homogeneous for the majority of the quality components. At the northern locations, the rate of change in quality was generally greater than the southern sites. The rate of change in forage quality with growing degree-days was, in general, greater at the northern locations. Furthermore, timothy at the northern locations reached the same level of a given quality component at a lower accumulation of growing degree-days than at the southern locations.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.69545 |
| Date | January 1992 |
| Creators | Portelance, Carole F. (Carole Françoise) |
| Contributors | Coulman, Bruce E. (advisor) |
| 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 Plant Science.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001324238, proquestno: AAIMM87851, Theses scanned by UMI/ProQuest. |
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