The teat develops in size as the young grows. Eutherian Mammals General Observations Below is a brief description of the mammary anatomy of goats, sheep, horses and pigs. These should be compared with the more detailed description of mammary anatomy of cattle. Does more synthesizing of milk components and less taking presynthesized components from the blood. Males have rudimentary ducts and teats.
Stallions have no mammary structures at all.
Generally milk is only used for the young. Cows can produce 10-20 X their wt. The blue whale grows to 200 tons and is 100 ft. They are located in the inguinal region. The teats vary considerably in size.