Studies at home and abroad have shown that animals have a wide range between the normal requirements for zinc and the dose of toxic, and pigs can tolerate 20 to 30 times the normal requirements. At the same time, the tolerated dose is also related to the form of adding zinc source. When high-dose inorganic zinc compounds (such as zinc oxide, zinc sulfate) are used, it is less likely to cause zinc poisoning in animals than organic zinc. Among the inorganic zinc compounds, the application of high zinc (2000-3000 mg/kg) in the form of zinc oxide has the effect of promoting piglet Growth and preventing post-weaning diarrhea in piglets, except that zinc oxide itself has astringent and weak antibacterial effects, possibly with oxidation. The biological potency of zinc is lower than that of zinc sulfate, zinc carbonate and zinc chloride, which is less likely to cause poisoning.
However, long-term feeding of high-zinc diets for livestock and poultry will have adverse effects on the development of the livestock industry and the ecological environment, and should therefore be given high priority. According to the Ministry of Agriculture of China, the amount of zinc in the form of zinc oxide in the compound feed in the first two weeks after weaning is not more than 2250 mg/kg.
Zinc oxide is highly chemically active and can react with a variety of organic substances (including organic matter in bacteria) to kill most bacteria and viruses.
After the piglets are weaned, the feed intake changes from a liquid to a solid, and the intestinal villi and intestinal epithelial cells are severely damaged. Zinc oxide can enhance the metabolism of nucleic acids and proteins by affecting the synthesis and level of biologically active substances such as insulin and zinc finger proteins. On the other hand, it promotes the proliferation and division of intestinal villi and intestinal epithelial cells through zinc finger proteins, and quickly repairs weaning due to piglets. Intestinal mucosa and villus damage caused by stress, effectively treating gastrointestinal ulcers caused by weaning stress. At the same time, it inhibits the growth of harmful bacteria and maintains the balance of intestinal flora.
A salt lick is a deposit of mineral salts used by animals to supplement their nutrition, ensuring that they get enough minerals in their diets. A wide assortment of animals, primarily herbivores, use salt licks to get essential nutrients like calcium, magnesium, sodium, and zinc. When a saltlick appears, animals may travel to reach it, so the salt lick becomes a sort of rally point where lots of wildlife can be observed.
Farmers have historically provided salt licks for their cattle, horses, and other herbivores to encourage healthy growth and development. Typically a salt lick in the form of a block is used in these circumstances, and the block may be mounted on a platform so that domesticated animals do not consume dirt from the ground along with the necessary salt. Salt blocks for farm animals can also be treated with medications, which may be convenient when someone needs to medicate shy animals, or a large group of animals.
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