Now, vitamin nutrition research has been developed to the level of molecular biology. In recent years, the newly discovered additional ef-feet has far exceeded the traditional category of vitamin deficiency prevention. The increasing challenges in the aquaculture industry have prompted people to rethink the appropriate vitamin supplementation standards in feed to achieve healthy, productive, and profitable breeding goals. With the increasing understanding of the role of various vitamins, especially the continuous development of aquaculture technology and people's expectations of the input and output of the aquaculture industry, the recommended amount of vitamins has been continuously revised. The addition of vitamin nutrition should not only prevent vitamin deficiency in livestock and poultry in the traditional sense, but also support the optimization of feeding in the commercial operating environment. 1. Re-Awareness of Vitamin Needs A typical test report that revealed the difference between the minimum nutritional requirement (NRC recommended amount) and the appropriate supply volume was published by Stahy et al. in 1995. He added different doses of vitamin premix (vitamin B2, niacin, pantothenic acid, and folic acid) to the pig feed at 70%, 170%, 270%, 370%, and 470% of the recommended NRC standards, respectively. No significant increase was found in the lowest addition dose of the test group. This result confirms that the benefit of increased vitamin supplementation is not only to alleviate deficiencies. The results of the trial also found that this advantage is evident in the growth of high-yield lean-type pigs compared to medium-lean pigs. This result also indicates that the optimal addition of B vitamins is satisfactory for deposition of proteins. Therefore, it is recommended to adjust the appropriate amount of B vitamins in pig feed for the growth phase to 200%-300% of the recommended amount of NRC. The rapid development of biotechnology has created many new miracles. The emergence of new varieties with high productivity has promoted continuous advancement of nutrition research. The demand for vitamins, in particular, varies greatly. The reasons may be as follows: 1 The breeding of new livestock and poultry breeds changes in the requirements of various vitamins; 2 Internal and external stress factors affect the animal's demand for various vitamins; 3 The market's quality requirements for products also restrict the supply of vitamins. 2. The misunderstanding of the use of multivitamins in the market There is still a long way to go in the development of the feed industry in China and the promotion and application of many new technologies. The uneven quality of feed has hindered the development of the livestock industry in the direction of quality and efficiency. In particular, there are many misunderstandings in the understanding of vitamins. Although people have recognized that vitamin C is one of the essential nutrients for livestock and poultry, its use does not meet the production needs of animals. At present, due to cost and other reasons, the deficiency of general-purpose compound vitamins for livestock and poultry is mainly due to the fact that the differences in livestock species, physiological stages and production purposes are not taken into account, resulting in excess vitamins in livestock and poultry diets and other vitamins. insufficient. Regarding the amount of vitamins used, different experts have their own opinions and it is difficult to have a unified conclusion. In short, satisfying the animal's nutritional needs for vitamins is the common desire of everyone to produce superior quantities of livestock and poultry products. 3. Re-evaluate the role of vitamin production Previously, people's understanding of vitamin supply was mainly based on the presence or absence of deficiencies. The purpose of our livestock and poultry breeding is to obtain its final product. More and more consumers are pursuing the intrinsic quality of livestock and poultry final products such as flavor, color, nutrition, health care, and hygiene and safety. In addition to nutrition, vitamins can also improve eggshell quality and egg yolk color, enhance meat freshness, extend shelf life, and improve reproductive performance. Therefore, to evaluate whether the supply of vitamins is appropriate, not only to consider the effects of feeding, input and output ratio, but also to determine whether it meets the needs of the market and achieve the best benefits.
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