Information on the mating system of these animals is not available.
The gestation period is about 10 months long. The calves are usually born in June and July. There is usually one young per a birth, averaging about 25 kg and 107 to 122 cm in size when born. The young are usually weaned at 18 months. The calving interval is 2 to 3 years.
Males become sexually mature between 2.1 and 2.4 m in length. Females become sexually mature between 1.94 and 2.22 m in length, which probably corresponds to 12 years of age (Klinowska, 1991). The maximum longevity of males is probably 22 years, whereas female longevity is 27 years.
Breeding interval: The calving interval is 2 to 3 years.
Average number of offspring: 1.
Average gestation period: 10 months.
Average weaning age: 18 months.
Average age at sexual or reproductive maturity (male): 12 years.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); fertilization ; viviparous
Average birth mass: 24000 g.
Average gestation period: 316 days.
Average number of offspring: 1.25.
Average age at sexual or reproductive maturity (female)
Sex: female: 2231 days.