Pregnancy sows "improper feeding restrictions" affect the subsequent reproductive performance of sows

The purpose of "limited feeding" for pregnant sows is to: 1 increase the rate of embryo implantation, 2 control the body condition, and increase the feed intake during lactation.

Interpretation of “improper feeding restriction”: “Inappropriate feeding restriction” does not necessarily mean weight index. It may be: insufficient deposition of body fat – expressed by “thickness of back fat”, or possibly due to nutritional formula and nutrient concentration The nutritional needs of pregnant sows are not taken into account in the case of “limited feeding”. The supply of nutrients related to the normal expression of reproductive performance and immune function is insufficient.

It is because the performance of the back fat is not necessarily insufficient to make it easy for the breeder to ignore. Therefore, the breeder and nutritionist should have a need to re-recognize the harm caused by the insufficient supply of special nutrients in the sow during the gestation period.

In the gestation period of the sow, the supply of protein and special nutrients in the body is insufficient. In addition to affecting the development of the fetus, what is particularly concerned with us now is the nutritional support required for the sow immune response, and the sow against the pathogen (from the environment or the body) ) the nutritional support required.

The sow is forced to bear the responsibility of the over-populated herd. There are more and more types of vaccines for pre- and pre-natal injections of sows. Feeders and nutritionists do not pay enough attention to the nutritional support needed to provide an immune response to the sow. Animal nutritionists should pay attention to a new field - the relationship between immunity and nutrition. This is a marginal subject.

Nutritional regulation of immune system activation: Activation of the immune system is to consume nutrients. A reasonable guess is that the nutritional requirements of the immune response are different in the state where the immune system is activated at a low level and the immune system is highly activated. Similarly, the nutritional requirements of the immune response should be different when the pig is attacked by the pathogen (type and quantity), after vaccination (type and quantity). When the pig's immune system is activated, it disrupts the normal physiological processes of the body, which can lead to delaying the growth of the body and reducing protein deposition in the body.

Sows during the gestation period due to limited feeding cause insufficient supply of protein in the body, and the more the number of immunizations, the more severe the nutritional overdraft of the sows, which not only fails to achieve the immune effect, but also reduces the resistance of the sows to the pathogens, ultimately affecting The sow's health status, which 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 question that foreign nutritionists are considering.