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Ovulation without cervical stimulation in domestic cats
D F Lawler1, S D Johnston, R L Hegstad
1Department of Pet Nutrition Research, Ralston Purina Company, Checkerboard Square, St Louis, MO 63164.
Journal of Reproduction and Fertility. Supplement
|January 1, 1993
Summary
Female cats may ovulate without mating. Proximity to other cats, including males, can induce non-coital ovulation in intact queens, as evidenced by elevated progesterone levels.
Area of Science:
- Reproductive endocrinology
- Veterinary science
- Animal behavior
Background:
- Ovulation in domestic cats is typically considered induced by coitus.
- The role of non-coital factors in feline ovulation requires further investigation.
Purpose of the Study:
- To investigate the occurrence of non-coital ovulation in intact female cats housed in proximity to other cats.
Main Methods:
- Serum progesterone levels were measured monthly for 9 months in 24 female cats using radioimmunoassay.
- Cats were housed in visual and auditory contact with other cats, including males, but direct physical contact was prevented.
Main Results:
- Seven of 20 intact queens (35%) exhibited progesterone levels indicative of ovulation (>= 4.8 nmol/L) at one or more sampling points.
- These occurrences of non-coital ovulation resulted in elevated progesterone concentrations, significantly higher than in other cats.
Conclusions:
- Proximity to other cats, including males, may be sufficient to induce ovulation in some intact female cats.
- Cervical stimulation is not always a prerequisite for ovulation in domestic cats under these housing conditions.