Herd' The term CATTLE UNIT can be summarized as a 'HERD' of cattle, which is a group of animals that are kept together for the purpose of breeding, raising, or harvesting. Cattle are typically domesticated animals, such as cows, bulls, and oxen, that are used for their meat, milk, and hides. A HERD of cattle is usually managed by a single person, known as a herdsman, who is responsible for the care and maintenance of the animals.