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Date of Award
Thesis - Pacific Access Restricted
Master of Science (M.S.)
First Committee Member
Second Committee Member
Alice S. Hunter
Third Committee Member
Ovulation due to hypothetical conspecific male pheromone(s) was examined in the dwarf African clawed frog (Hymenochirus curtipes, Noble, 1924). Oviducts of females were examined for the presence of eggs in untreated females and after exposure to each variable condition. A flow-through water system was constructed, and a total of nine experimental runs performed. Mature, female H. curtipes were exposed to seven different water conditions to discern which stimuli induced ovulation. One ovulation stimulus may be a male pheromone; the cutaneous post-axillary gland of male H. curtipes and the testes have also been suggested as possible organs of pheromone secretion. Therefore, females were exposed to post-axillary gland and testicular homogenates. Females were also exposed to other variable conditions, including plain flowing water, gonadotropin releasing hormone agonist (GnRH-a) in water, and GnRH-a injected males. Ovulation was induced in females exposed to two of the variable conditions: GnRH-a injected males (87%) and uninjected-glandless males (85%). No other treatments induced ovulation at these levels, although GnRH-a in water induced ovulation in females (70%). From the results obtained, it can be concluded that male H. curtipes secrete chemical(s) which stimulate(s) females, though the source and nature of the pheromone has not been identified. While GnRH-a in water can induce ovulation in females, it is not as effective as the pheromone(s) released by male H. curtipes.
Milaney, Kirsten Ann. (1998). Pheromonal stimulation of ovulation in female Hymenochirus curtipes : a thesis .... University of the Pacific, Thesis - Pacific Access Restricted. https://scholarlycommons.pacific.edu/uop_etds/2327
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