The influence of 4, 5 and 6 generations of selection for duration of fertility of frozen-thawed chicken semen on fertility and hatchability of frozen-thawed semen, fertility of fresh semen, semen volume, concentration of spermatozoa, spermatozoal motility and on spermatozoa and seminal plasma cholesterol and phospholipid levels and their ratios (generations 5 and 6) as well as the genetic influence on these traits was studied. A selected line and an unselected control line of broiler chickens were used. / All estimates of fertility of frozen-thawed and fresh semen were significantly (P 0.05). / The heritabilities of fertility of frozen-thawed and fresh semen and semen characteristics were generally low and those for spermatozoa lipid levels and their ratios were generally medium. / The positive phenotypic correlations between estimates of fertility within frozen-thawed and fresh semen were high but low between fertility of frozen-thawed and fresh semen. The phenotypic correlations between semen characteristics and fertility were inconsistent. The phenotypic correlations of spermatozoa and seminal plasma cholesterol with fertility of frozen-thawed semen were negative as were the phenotypic correlations of seminal plasma cholesterol with fertility of fresh semen. Genetic correlations were also calculated and were similar in direction to the phenotypic correlations but their magnitudes exceeded unity in many cases. The level of inbreeding was uncorrelated with either fertility, semen characteristics, spermatozoa and seminal plasma lipids or their ratios.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.68531 |
| Date | January 1980 |
| Creators | Ansah, George Ackah |
| 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 Animal Science) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 000112940, proquestno: AAINK51847, Theses scanned by UMI/ProQuest. |
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