A dairy herd is a group of COWS that are kept together for the purpose of producing milk. The term 'dairy herd' is often used to refer to the COWS themselves, as well as the people who care for them. COWS are the primary source of milk in many parts of the world, and they are an important part of the agricultural industry. A dairy herd typically consists of several COWS, and they are usually kept in a barn or other enclosed area. The COWS are milked regularly, and the milk is then processed and sold.