Beta-carotene is a precursor of vitamin A, and the efficiency of its conversion to vitamin A varies greatly depending on the animal species. --carotene has an independent physiological effect unrelated to vitamin A, can enhance the information transmission between cells, is an antioxidant that cuts off the chain reaction, can eliminate toxic oxygen free radicals in animals, and can improve the animal's own immunity. Resist the invasion of bacteria and viruses, improve the survival rate of farmed animals; promote animal growth and improve production performance, especially for the reproductive performance of female animals and poultry; β-carotene is natural yellow or orange, which is also effective Coloring agent.
With the development of the feed industry, various feed additives and processing aids are increasingly used in compound feed production, and β-carotene is one of them. The purpose of adding coloring agents to the feed is to increase the color of the animal, poultry and aquaculture animal products, such as the butter color of the milk, the egg yolk and the outer skin of the egg, and the color enhancement of the feathers of the bird, thereby increasing the product value. In addition, the color of the feed can be changed by the coloring agent to stimulate the appetite of the animal and the bird. Moreover, β-carotene can exert antioxidant properties, thereby improving the body's immunity. Animals produce some highly active oxygen-containing molecules during normal metabolism, such as free radicals, hydrogen peroxide, etc. Beta-carotene can regulate the concentration of free radicals and hydrogen peroxide in cells, thereby improving the immunity of animal organisms.
Studies by American scholars have shown that red yeast, trispora, can ferment β-carotene, which is a good egg yellow and deepening agent. Chicken, duck and goose can be applied. The egg yolk is dark yellow and orange red, commonly known as “red heart egg”. With the improvement of people's living standards, “red heart egg” is more and more popular; and egg export also requires certain color grade standards for egg yolk, that is, it must reach level 8 The party meets the export standards. Therefore, the production of "red hearts" has become an important issue that can not be ignored by laying hens. Chickens eat beta-carotene-rich feeds, which produce deep egg yolks because chickens can store excess beta-carotene that is not hydrolyzed to VA, and egg production rates increase, beta-carotene and others. Some vitamins can also prevent some laying hens from moulting, thus increasing the egg production rate during the moulting season.
Supplementing a certain amount of β-carotene to the bull can increase the amount of sperm production and increase sperm motility. Conversely, when the supply is insufficient, the abnormal chromosome will be higher than in normal semen. Beta-carotene is also important for cows. If it is lacking, it will cause cows to have weak estrus, slow ovulation, frequent follicular cysts, low conception rate, early pregnancy abortion, severe cases, reproductive failure, and placental development stagnation. .
Beta-carotene can also promote the growth of Chinese sturgeon. Yang Xinyu used β-carotene produced by the pharmaceutical factory to feed 89 Chinese sturgeons weighing 128 g in 0.4% of the feed. After 73 days of testing, the results showed that the test composition of β-carotene was added. The rate was 15.8% higher than that of the control group, and the daily gain was increased by 105.6%. The β-carotene feed additive has the functions of enhancing the resistance of the corpus callosum, promoting the growth of mites, improving the meat quality, reducing the feed cost, improving the feed efficiency, and having no residue, no drug resistance, etc., and can produce the mites. Non-polluting, high nutritional value and good flavor, it will be widely used.

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