What is the major component of a cow's mammary system?

The major component of a cow's mammary system is the udder. The udder is a complex organ responsible for the production and storage of milk, which is crucial for nourishing calves and provides the basis for dairy production. It consists of four quarters, each with its own teat, and is richly supplied with blood vessels and secretory tissue that allows for efficient milk synthesis.

While the teat is important for milk secretion and allows the calf to nurse, it is not the primary component of the mammary system; rather, it serves more as an extension of the udder. The ovary plays a different role in the reproductive system by producing eggs and hormones related to reproduction. Hormones are significant in regulating various physiological processes, including lactation, but they are not structural components of the mammary system itself. Thus, the udder is recognized as the main structure involved in the milk production process.