Title page for ETD etd-07212010-020044

Type of Document Master's Thesis
Author Cowles, Cleveland J.
URN etd-07212010-020044
Title Ovarian and uterine changes of gray squirrels as affected by season, aged, reproductive state and exogenous hormones.
Degree Master of Science
Department Wildlife Management
Advisory Committee
Advisor Name Title
Kirkpatrick, Roy L. Committee Chair
Mosby, Henry S. Committee Member
Scanlon, Patrick F. Committee Member
  • reproductive states
Date of Defense 1974-12-05
Availability restricted
Sixty-seven adult and 42 subadult female gray squirrels (Sciurus carolinensis) were collected over a period of one year between December, 1966 and November, 1967 in the vicinity of Blacksburg, Virginia. Each squirrel was classified as being in one of four reproductive states (vaginal orifice closed, vaginal orifice open, pregnant, or lactating). Differences in ovarian and uterine characteristics due to month, age, and reproductive state were analysed by analysis of variance and a multiple range test.

Pregnant adults had significantly (P Ovarian and uterine weights of subadults were less than adults during most months. Ovarian and uterine weights increased in late winter, decreased in early spring, increased during the summer and decreased in the fall. Follicular development was more variable, but showed general increases in the summer months. The seasonal trends reflected the frequency of occurrence of the various reproductive states in the monthly samples.

Two experiments were conducted on captive female gray squirrels. In the first experiment it was determined that FSH-P can cause the formation of luteal glands in the absence of HCG injection. LH contamination of FSH-P probably caused the luteinization. There were no significant differences in ovarian response between squirrels receiving HCG subcutaneously and those receiving it intravenously after pretreatment with FSH-P. In the second experiment, 2.0 mg FSH-P/d~ on days 1, 2, 3, 4, 5, 6, and 7 with subcutaneous injection of 200 IU HCG on day 13 produced significantly (p<0.05) more luteal glands than 200~ FSH-P on days l~ 2, 3, 4, 5, 6, and 7 with subcutaneous injection of 200 IU HCG on day 5. However, there were no significant differences in development of tertiary follicles. Squirrels treated with NIH-FSH-S-6 and HCG had development of large tertiary follicles with no luteinization.

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