The milk-secreting organ in cattle is called the udder. It is a specialized mammary gland that is located on the lower underside of the cow's body. The udder is made up of four separate compartments, or quarters, each containing a network of mammary glands that produce milk.
During milking, a suction device is attached to the teats of the udder, which extracts milk from the cow's mammary glands. The milk is then collected in a container for processing and distribution.
Cows are commonly bred for their milk, which is a nutritious source of protein, vitamins, and minerals. The milk can be consumed as a beverage or used to make dairy products such as cheese, butter, and yogurt.
In summary, the udder is the milk-secreting organ in cattle. It is a specialized mammary gland that produces milk, and is located on the lower underside of the cow's body.