Milk is a white liquid produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals before they are able to digest other types of food. Early-lactation milk contains colostrum, which carries the mother's antibodies to its young and can reduce the risk of many diseases. Milk contains many other nutrients and the carbohydrate lactose.
As an agricultural product, milk is extracted from mammals during or soon after pregnancy and is used as food by people. Throughout the Union, Terran cattle produce the majority (86%) of milk sold, followed by buffalo (11%) and goats (2%), with all other mammals last (1%). Planet Holstein is the Union's largest single exporter of milk and milk products. Pluribus is the Union's largest importer of milk and milk products, followed by Archa.
There are more than six hundred trillion consumers of milk and milk products. Over 750 trillion people live within Union dairy farming households.