Judging from the summary of non-epidemic cases in various places at present, the incidence of initial infection in sows is high. Why do sows become the most susceptible animals? According to the data:
Sow's own loss: sow breeding all the year round? Pregnant? Delivery? In the high-intensity reproductive production of breast-feeding, the body's own nutrition is gradually exhausted, and there are problems such as insufficient and unbalanced supply of exogenous nutrition, which eventually leads to serious loss of the body, deficiency of both qi and blood and decreased resistance. Often manifested as: the sow's skin is pale and the back hair is rough and messy; The labor process is too long and the lochia is endless; Postpartum loss of appetite, less milk; Weaned sows do not estrus for a long time; Newborn piglets have poor vitality, and many of them are weak.
Toxin accumulation: The toxins mentioned here include drugs, molds, endotoxin and other exogenous and endogenous toxins. The breeding cycle of sows is long, ranging from 2 years to 4-5 years. Various toxins accumulate in the body for a long time, and the problem of constipation in sows will further aggravate the accumulation of toxins in sows, which will eventually lead to metabolic disorder in sows. Often manifested as: rust-colored bleeding spots on the back or whole body, and more tears in the eyes. The poor quality of milk makes the baby healthy and prone to diarrhea.
Low immune function: when toxins accumulate in the body, the liver detoxification function and kidney excretion function are affected, the liver and kidney function are damaged, and the toxin accumulation in the body is further aggravated, which eventually leads to decreased immune function, immunosuppression and secondary pathogen infection, and the problem is getting more and more serious. The common manifestations are: immunosuppression, poor immune effect of vaccine, diarrhea of suckling piglets, frequent occurrence of Haemophilus parasuis, poor uniformity, high morbidity and mortality.
Viral recessive infection: Although the appearance of sows has no obvious symptoms, the health status of pigs is poor! The production is unstable, and various problems often occur: cold and fever, stillbirth and miscarriage, small number of babies, repeated infertility, low reproductive performance and high elimination rate.
The above reasons are for your reference. Therefore, on the basis of biological safety, how to improve the comprehensive immunity of sows has become a top priority.