Ovulatory cycle characteristics in Macaca fascicularis

Area of Science:

• Reproductive biology
• Primate reproductive cycles
• Veterinary science

Background:

• Understanding ovulation patterns in non-human primates is crucial for reproductive research.
• Macaca fascicularis (crab-eating macaques) are widely used models for human reproductive studies.
• Longitudinal studies are needed to assess factors influencing ovulation and cycle regularity.

Purpose of the Study:

• To investigate ovulation laterality in adult Macaca fascicularis.
• To determine the effect of previous cycle's ovulatory status on cycle length.
• To assess the impact of consecutive ovulations from the same ovary on cycle parameters.
• To evaluate the effect of laparoscopy on reproductive parameters.

Main Methods:

• Observation of 595 menstrual cycles over five years in 28 adult M. fasicularis.
• Laparoscopic observation of ovulation in 138 cycles.
• Analysis of cycle length in relation to ovulatory status and laterality.
• Assessment of laparoscopy's impact on studied parameters.

Main Results:

• Ovulation occurred on the left ovary in 62.6% of observed cycles.
• No significant effect of previous cycle's ovulatory status on cycle length was found.
• No significant effect of consecutive ovulation from the same ovary on cycle length was observed.
• Laparoscopy did not influence the studied reproductive parameters.

Conclusions:

• Ovulation in M. fasicularis shows a significant left-sided preference.
• Menstrual cycle length is not significantly affected by ovulation laterality or previous cycle status.
• Laparoscopy is a safe procedure with no discernible impact on reproductive parameters in this model.