The ovary is a bean shaped organ which varies in
size with season. During the winter, most mares have small, hard
ovaries. As the light increases, there is an increase in connective
tissue and small follicles and the ovary increases in size. The
ovaries and follicles of the mare are the largest in the farm animal
species [2-3 inches (6-8 cm) in length, 1-1.5 inches (3-4 cm) in
height, 70-80 gm]. The ovary has both an exocrine function (produces
eggs) and an endocrine function (produced hormones).