They are reported to breed at the end of winter.

He decided to try breeding them at his 100-acre farm.

Females are ready to breed at about seven years old.

These creatures may breed at any time of the year.

If a male attempts to breed with her at this point, the female will attack him.

Males and females are able to breed at one year of age.

Females breed at a younger age because the male population is larger.

I thought war had been bred and conditioned out of them at the very moment when they needed this ability the most.

Black robins will generally start to breed at two years of age.

A discovery has shown females are not breeding at the same time in a year.