(1) Lactating cows: According to the diet dry food intake of 0.46% or 1% of the compound feed (or concentrate supplement), it can meet the needs of dairy cows. Generally, lactating cows feed 15 grams of salt a day; 30 grams of salt per day is more than 20 kilograms. (2) Non-lactating cows: Calculated according to the dietary dry matter intake of 0.25%-0.3%, can meet the needs. The maximum tolerated level of salt in lactating cows is 4% of dry matter in the diet; the maximum tolerated level of growing cows is 9%. It has been proven that high levels of salt increase breast swelling and are not conducive to feeding management. Bread Magnet,N50 Ndfeb Magnet,Permanent Magnet Yongze Magnet Co., Ltd. , http://www.nb-magnets.com