Claim: The average gestation period is 20 days, and a fertile postpartum estrus occurs 14–24 hours following parturition (the act or process of bearing or bringing forth offspring).
Evidence: A fertile postpartum estrus occurs 14–24 hours following parturition, and simultaneous lactation and gestation prolongs gestation by 3–10 days owing to delayed implantation. The average gestation period is 20 days. Birth is the act or process of bearing or bringing forth offspring, also referred to in technical contexts as parturition.