Historically, certain sub-professions within the field of Animal Husbandry are specifically named according to the animals which are cared for.
A swineherd is a person who cares for hogs and pigs (older english term: swine). A shepherd is a person who cares for sheep. A goatherd cares for goats. In previous years, it was common to have herds which were made up of sheep and goats. In this case, the person tending them was called a shepherd. King David of Israel was a shepherd before he was anointed to be king.
In more modern times, cowboys (or in Spanish: gauchos) rode horses and participated in cattle drives to watch over cows and bulls raised primarily for food.
Today, herd managers often oversee thousands of animals and many staff. Farms and ranches may employee breeders, herd health specialists, feeders, and milkers to help care for the animals. Techniques such as artificial insemination and embryo transfer are frequently used not only as methods to guarantee that females are bred but to help improve herd genetics. This in turn improves the ability of the animals to convert feed to meat, milk, or fiber more efficiently and improve the quality of the final product.