The rumen is an important part of the cow's digestive system that breaks down cellulose and other plant material. However, because cattle often inhale metal substances when swallowing food, such as cattle nails, iron wires, etc., these metal substances may accumulate in the rumen, causing rumen foreign body symptoms. The function of the rumen magnet is to absorb and gather metal substances in the rumen, prevent them from irritating the rumen wall, and relieve discomfort and symptoms caused by foreign bodies in the rumen. The rumen magnet attracts the metal substance magnetically, so that it is fixed on the magnet, preventing it from moving further or causing damage to the rumen wall.