As long as cattle and sheep lick bricks, cattle and sheep are healthy. Some people think that the feed contains various minerals and vitamins, and there is no need to use lick bricks. This is a misunderstanding of licking bricks by some people, and they do not understand the function of licking bricks. We will never get precise nutrition. In addition, animals differ too much in breed, gender, age, physiology, climate, captivity, management, etc., and it is difficult to obtain truly accurate nutrition.
            Scientific research shows that due to the needs of growth, development and production, cattle and sheep not only need nutrients such as energy and protein, but also nutrients such as mineral elements and vitamins to ensure their normal growth and production. For example, a goat weighing 40 kilograms has a daily gain of 75 grams. Daily metabolic energy intake is 1 megajoule, crude protein 92 grams, calcium 3.5 grams, phosphorus 2.7 grams, sodium chloride (salt) 5-10 grams, trace element iron 30-40 mg, copper 5-6 Mg, 30-40 mg of manganese, 50-60 mg of zinc, 0.1-02 mg of cobalt, 0.5-1 mg of Mo, 0.1-02 mg of selenium, 0.2-04 mg of iodine. Some nutrients can be fed with fodder grass and supplementary concentrates to meet the needs of cattle and sheep, while others need to be fed separately. If the nutrient licking block provided is good, the amount of food licked by cattle and sheep will be small, and the nutrition will be insufficient, and the effect of supplementary feeding licking block will be lost. Of course, if the licking brick is too soft and falls off too easily, it will cause waste and will not work.