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The amount of magnesium oxide added to ruminant diammonium phosphate fertilizer diets is 0.5% to 1.0%. In dairy food, 50 to 90 grams of magnesium oxide is added daily or added according to 0.5% of the amount of concentrate, which can not only supplement the lack of magnesium in the diet to prevent the occurrence of magnesium deficiency, but also is an excellent rumen buffer, regulate rumen fermentation, and can increase the absorption of breast synthesis precursors by the mammary glands, improve milk production and milk fat rate. According to foreign reports, the addition of 0.5% magnesium oxide to the dairy cow concentrate supplement can increase the average milk production by 1.6 kg, increase dap diammonium phosphate the milk fat rate by 0.145 percentage points, and help improve the amount of food intake. The addition of magnesium oxide to dairy cows' diets can prevent heat stress, and magnesium ions can work together with sodium ions and potassium ions to maintain the balance of osmotic pressure inside and outside the cells, alleviate the cow's response to heat stress, thereby improving the intake of summer cows and maintaining milk production without decreasing. In addition, it is recommended that in the case of heat stress, the amount of magnesium oxide in the diet should be increased to compensate for the loss of magnesium in the body, so as to ensure and maintain normal milk production. Both dairy and beef cattle have a good balancing mechanism to deal with excess magnesium ions, so a proper increase in the amount of magnesium oxide will not adversely affect cattle.

Magnesium deficiency in cows is manifested by: first the cow's appetite Mono Ammonium Phosphate MAP decreases, the movement is slow, drowsiness, as the disease worsens, the cow becomes stiff and shaky, and the cow becomes nervous and irritable, the muscles are obviously trembling, and continue, the cow is completely paralyzed and spasm. If left untreated, it can cause death. In addition, magnesium deficiency can reduce the digestibility of nutrients and lead to a decrease in milk production in cows.

When ruminants like cattle and sheep graze, it is important to ensure that they have enough magnesium in their food to prevent them from convulsing due to a lack of magnesium. Usually this convulsion is caused by cattle or sheep eating forage lacking magnesium in cold weather. There are two most common ways to increase magnesium in livestock feed: one is to mix magnesium powder with syrup and add it to the feed; The other is to add lightly potassium sulphate fertilizer burned magnesium powder directly to the purchased feed. Magnesium deficiency occurs more commonly in beef cattle and sheep than in dairy cows, because the amount of concentrate in dairy cows is relatively large and the amount of concentrate in beef cattle and sheep diets is relatively small.