West Virginia University
Effect of concentrations of progesterone on follicular development and fertility in beef cows
Abstract
dc:description.abstractThe present study was performed to investigate the effects of low ascending concentrations of progesterone on fertility in lactating beef cattle. Cows on the low ascending progesterone treatment received PGF2alpha from days 3 to 4 after estrus. All cows received PGF2alpha on day 9, and estradiol benzoate on day 11. Cows were inseminated artificially 12 hours after estrus. Concentrations of progesterone were lower in treated versus control cows. Pregnancy rate did not differ between treated and control cows. Pregnancy rate was greater in cows that ovulated a follicle from the right (78%) versus left (52%) ovary (p < 0.01). Low ascending progesterone early in the estrous cycle did not decrease fertility to the same extent seen with extended periods of low progesterone.
Degree
thesis:*- Name thesis:degree_name
- MS
- Level thesis:degree_level
- Thesis
- Discipline thesis:degree_discipline
- Animal and Nutritional Sciences
- Year dc:date.available
- 2001
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Candler, Jason Brian
Subjects
dc:subject × 2Identifiers
dc:identifier.*- Identifier
- https://researchrepository.wvu.edu/etd/1285
- OAI identifier oai:identifier
- oai:researchrepository.wvu.edu:etd-2288