At present, almost all pig farms in China have light or heavy respiratory problems, which are manifested as: coughing and gasping, increased proportion of sickness, slow growth or stagnant growth, low feed conversion rate, and increased cost of prevention and control. the swine farm is one of the most important diseases headache, but also "heat stress syndrome" occurs biggest incentive.
According to survey data from various places, more than 85% of slaughter pigs have local epidemic pneumonia, which has typical pulmonary pathological changes; 50% of farms have infectious pleo-pneumonia, mixed infection and secondary infection. When respiratory syndrome (PRDC) occurs, the difficulty of treatment increases, and the mortality rate increases. The general mortality rate is 10% to 20%.
The characteristics of the current respiratory tract: rapid onset and rapid spread. The incidence of nursery pigs and middle pigs is the highest. It is often complicated by viral diseases such as blue ear disease, circovirus and pseudorabies, and is converted into PRDC (respiratory syndrome).
Causes
1. Stress factors are manifested in high density, climate change, group transfer, grouping, castration, and concentration of harmful gases. It has entered the winter season until the spring of next year, which is the high season of respiratory tract. The concentration of harmful gases and the temperature difference are the most important factors to pay attention to at present.
2, the physical factors of pigs, the pig's physical condition is low, the disease resistance is poor. There are many factors that cause low physique in pigs: low nutrient levels, inadequate management, excessive feed forxins and persistent infections with immunosuppressive diseases.
3. Disease factors
The virus is mainly blue ear virus, circovirus type 2, influenza virus, swine fever virus and the like.
Bacterial infection of Actinobacillus pleuropneumoniae, Bordetella septicum, Pasteurella multocida, Streptococcus, and the like.
Nematodes, silkworms and toxoplasma.
Prevention and control measures for respiratory diseases in pig farms
For respiratory diseases, many pig farms have been on the prevention of treatment, and the cost is also very large, but it does not achieve the desired effect, and it is always repeated. Why? The main reason is that the pig farms have not adopted comprehensive prevention and control measures. In terms of specific control measures, they cannot be controlled according to the characteristics of various respiratory diseases.
1. Large-scale pig farms should try their best to self-support.
2, all in and out, especially in the delivery room and nursery, must be all in and out, cut off the horizontal spread of pathogens.
3, do a good job in feeding management to establish a scientific and rational immunization and disinfection procedures.
4, try to reduce stress environment stress is the top priority in stress, especially now when the winter temperature is relatively low, pay attention to density and harmful gases, solve the contradiction between ventilation and ventilation.
5, improve feed quality, enhance the health of pigs: we must control the quality of feed, according to various research data, the over-standard of mycotoxins in feed is the biggest "invisible killer" on the farm, and the largest immunosuppressive factor . When the pig's constitution declines, many pathogenic microorganisms will take advantage of it.
6, do a good job of vaccination of viral vaccines: scientifically and rationally arrange the immunization program.
7, do a good job of deworming and killing work Most pig farms do not attach great importance to deworming, the procedure is not very reasonable, the use of anthelmintic drugs is not widely available.
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