America Bison Mating Habits

by Wildlife Adm November 05, 2023

Bison are polygynous, meaning that a dominant male, or a bull, mates with a group of females. The season for breeding takes place in summer, from June to September while the gestation period lasts about 285 days. A female can give birth to a single calf each season.

Newborn calf weight about 15-25 kg. To give birth, bison females choose shelter, a distant place far from the herd. Protection of the calf lies on the shoulders of females whereas males don’t take part in this process. Babies are breastfed for 7-8 months and weaned when they are one year old. Males reach sexual maturity at the age of 3 years and females - from 2 to 3 years.