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There is indeed a direct relationship between nutrition and disease resistance, and good nutrition can ensure the normal development of the pig's immune system. The nutritional standards of pigs are established under normal production conditions. However, in the process of disease development or during stress response, the demand for certain nutrients by pigs, especially the nutritional requirements of the immune system, increases accordingly. This may result in The relative lack of these nutrients affects the function of the immune system. That is, the lack of nutrients affects the immune system more than the effect of growth, so it is prone to various infectious diseases. The nutritional deficiencies that specifically impair the development of the immune system include linoleic acid, vitamin A, E, iron, zinc, selenium, and several B vitamins. Therefore, in the course of disease or stress reaction, adding enough vitamins, trace elements, etc., can improve the resistance of pigs and accelerate the recovery of the disease.