Usually refers to the black variant of Holstein cattle, which is a dairy cow breed originating in the Netherlands and renowned for its high-yield dairy products. It is one of the most popular dairy cattle breeds in the world, widely raised in dairy farms around the world. Large in size, well proportioned in structure, with strong limbs and wide breasts, it helps support one's weight and provides enough space to accommodate large breasts. Generally gentle and easy to manage in personality, with strong adaptability to caretakers and the environment. It is an efficient dairy producer that can produce a large amount of milk every day, with high milk fat and protein content, suitable for making various dairy products.