Horse mating season

It begins in the spring because horses are sensitive to the lengthening of the days. Indeed, light stimulates the secretion of certain hormones. When a female is in heat, she emits what are called pheromones detectable by a male several miles away. This usually curls up his upper lip in a characteristic grimace called "flehmen". In the presence of the mare, it begins its court: dilated nostrils, ears erect, head raised, carrying its tail in plume. It utters short, short neighs, turns around and comes, sideways to avoid blows, to sniff it and nibble its rump and sides