Which statement about guinea pig reproduction is NOT true?

• A. They are spontaneous ovulators.
• B. The estrus cycle interval is 15-17 days.
• C. Pubic symphysis fuses at 7 months.
• D. They should be mated after 7 months.

Answer: (D)

The key concept is how guinea pig reproduction is managed to avoid birth complications. Guinea pigs are induced ovulators, meaning ovulation is triggered by mating rather than occurring on a set cycle. Their estrous cycle interval is about 15–17 days, so females can be receptive and mating opportunities arise roughly every couple of weeks. The pubic symphysis fuses around 7 months of age, which narrows the birth canal and makes dystocia much more likely if birth occurs after that point. Therefore, breeding after 7 months is not advisable. The statement about mating after 7 months is not true because it increases the risk of difficult or obstructed labor; optimal practice is to mate before the pelvis fuses.