, Volume 23, Issue 3, pp 444–452 | Cite as

Temporal relationship of hormonal peaks to ovulation and sex skin deturgescence in the baboon

  • Abubakar A. Shaikh
  • Shamim A. Shaikh
  • Cornelio L. Celaya
  • Ignacio Gomez


The purpose of this study was to determine the temporal relationship of peak levels of oestradiol (E2), LH and progesterone to ovulation and sex skin deturgescence in the baboon. A total of 55 baboons were used in these studies. Hormonal levels were measured in 47 cycles and ovulation was documented by laparoscopic examination in 26 of these cycles. A temporal relationship of ovulation to sex skin deturgescence was established in 57 cycles. The mean interval from E2 peak to ovulation was 41.4±2.3 hr, the interval from E2 peak to LH peak was 17.3±2.0 hr and that from LH peak to ovulation was 18.4±2.0 hr. Eleven baboons showed an LH peak on the day of the E2 peak. The number of days to the first sign of sex skin deturgescence after ovulation was 2.07±0.14 days (range 0–5 days). Nineteen cycles (33.3%) showed sex skin deturgescence 1 day after ovulation, another 19 cycles (33.3%) showed sex skin deturgescence 2 days after ovulation, and only 13 cycles (22.8%) showed sex skin deturgescence 3 days after ovulation. Sex skin deturgescence was observed on day 0, 4 or 5 postovulation in only two baboons.


Progesterone Oestradiol Hormonal Level Animal Ecology Temporal Relationship 
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Copyright information

© Japan Monkey Centre 1982

Authors and Affiliations

  • Abubakar A. Shaikh
    • 1
  • Shamim A. Shaikh
    • 1
  • Cornelio L. Celaya
    • 2
  • Ignacio Gomez
    • 2
  1. 1.Department of Veterinary Physiology and Pharmacology, College of Veterinary MedicineTexas A&M UniversityCollege StationU.S.A.
  2. 2.Southwest Foundation for Research and EducationSan AntonioU.S.A.

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