Only a small part of an ejaculate of semen is composed of sperm cells. Most of the volume of semen is from secretions of accessory glands that are stimulated by the secretion of testosterone by the testes. The major accessory glands are ampullary gland, seminal vesicle, prostate, cowers gland, coagulating gland, and preputial gland. The presence, size, and amount of secretion by the different glands vary among species. For instance, ampullary glands are large in stallions and absent in boars. Seminal vesicles are large in boars and absent in dogs. Accessory glands are absent in birds. The differences in the occurrence and size of accessory glands result in differences in volume and composition of semen.

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