Female ferrets are polyestrous, meaning they usually come into heat more than once a year. Under natural lighting conditions - one - two times a year. With adjustment of photoperiod (extra lighting) up to five per year.
The ferret is a photoreceptive breeder. Breeding season is triggered by photoperiod, the length of daylight hours, when there is more daylight than night or the ratio of daylight hours to night time hours (more than 12 hours of daylight in a day) cause physical changes in their bodies. The time of year or month varies depending on where in this world you live, the ferrets brain perceives the right time by the length of daylight hours. Ferrets can also be affected by exposure to artificial lighting that will cause them to go into season.