This kind and peaceful life ends in October when the manhood of the males awakens. Each tries to build the most abundant harems. The rutting period lasts roughly a month, between mid-October and mid-November.
In forest areas where monitoring is more complicated, the male is satisfied with a few daines, while in open meadow, he can reserve about thirty partners. As with deer, the flirting technique adapts to the circumstances. Some males prefer to defend their territory, waiting for one or more daines to put the hoof on it, while others seize their future wives by landing on their territory.
And when two rivals meet, they challenge each other. If one of them wins by size and aggressiveness, he does not even have to fight to win. If the two males are similar in size, the fight can be spectacular, sometimes deadly. The weakest quickly makes a reason.
The winner must now honor all his females so proud of their hero. For each, he frequently puts the cover back to be sure of a future paternity. Needless to say, he leaves a lot of strength there. Between the surveillance of its females and its sexual activities that leave it little time to eat, the deer can lose a third of its weight
After a gestation of 8 months, the daine isolates itself to give birth, in June, to a fawn, much more rarely to two.