In a study of the seasonal reproduction and movements of the barren ground caribou, Rangifer tarandus groenlandicus (Linnaeus), it has been shown that cemental annuli, formed in the incisor teeth, are reliable indicators of age. The males are sexually mature at 17 to 18 months of age; the first conception in the majority of females occurs during the third and fourth breeding season after birth. Mature bulls are in breeding condition from mid-September until early December. The rutting period extends from mid-October to the first week in November, mainly from October 20 to 25. The blastocyst implants about 27 to 29 days after mating. The corpus luteum attains its maximum size and vascularity at the time of implantation; retrogressive changes commence about 2 months prepartum.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.115176 |
| Date | January 1963 |
| Creators | McEwan, Eoin. H. |
| Contributors | Dunbar, M. (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 | Doctor of Philosophy. (Department of Biology.) |
| 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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