"Improper feed restriction" influences sow's subsequent reproductive performance

The purpose of “restricted feed” for pregnant sows is to: 1 increase embryo implantation rate, 2 control body condition, and increase feed intake during lactation.
“Unreasonable feed restriction” interpretation: “Incorrect feed restriction” is not necessarily expressed as a body weight indicator. It may be due to: insufficient deposition of body fat – expressed as “thickness of back fat”, possibly due to nutritional formulas and nutrient concentrations. Did not take into account the nutritional needs of pregnant sows in the "restricted feeding" situation. Insufficient supply of nutrients associated with normal expression of reproductive performance and immune function.
It is because it is not necessarily expressed by the thickness of back fat, and it is easy for the breeder to ignore. Therefore: Feeders and nutritionists need to reconsider the harm caused by insufficient feeding of special nutrients in the body during the gestation period of sows due to restricted feeding.
During pregnancy, insufficient supply of protein and special nutrients in the body, in addition to affecting the development of the fetus, we are particularly concerned about the nutritional support needed for the sow's immune response. The sow is resistant to pathogens (from the environment or the body). ) The nutritional support needed.
The sows were forced to bear the burden of immature swine immunization. There are more and more types and times of vaccines for sows that are given pre- and post-partum injections. Feeders and nutritionists do not pay enough attention to the nutritional support needed for the sow’s immune response. A new field that animal nutritionists should pay attention to is the relationship between immunity and nutrition. This is a marginal discipline.
Nutritional regulation of immune system activation: The activation of the immune system is to consume nutrients. A reasonable hypothesis is that the nutritional requirements of the immune response are different when the pig is under mild activation of the immune system and the immune system is highly activated. Similarly, the nutritional requirements of the immune response should also be different when the pig is attacked (type and number), after vaccination (type and quantity). The activation of the pig's immune system disrupts the normal physiological process of the body. This change will lead to delay the growth of the body and reduce the body's protein deposition.
Due to feeding restriction in the gestation period of sows, the protein supply in the body is insufficient, and the more times of immunization, the more severe the sow’s nutritional overdraft, which not only fails to achieve the immune effect, but also reduces the resistance of the sow to the pathogen and ultimately affects the sow. The sow’s health status thus causes irreversible damage to the sow's subsequent reproductive performance.
Is the immune system the target of the next functional feed (premix)? - This is a problem that nutritionists in foreign countries are considering.