porcine respiratory disease syndrome (porcine respiratory diseases, complex, prdc), is a kind of the floorboard of the respiratory disease caused by many factors, is common breeding pig disease, prdc was put forward for the first time was in 1998, the 15th international conference pig disease. the prdc is also known as the "18 weeks of age wall", because the disease is susceptible to 18 weeks of breeding pigs, a "invisible wall" that is more difficult to pass through. so far, prdc's onset is in advance, and some of the piglets have begun to show clinical symptoms, and the most serious is the late nursery and early fattening pigs.
winter and spring seasons alternately is prdc season, this is due to large temperature difference between day and night at this time, easy to damage the pig respiratory tract mucous membrane, destruction of defence protective screen of the respiratory tract, causing all kinds of air germs, easy to enter the respiratory tract and lungs, causing secondary mixed infection.
prdc is a hybrid infection caused by many factors, such as various pathogenic factors and environmental stress. the pathogen of viral pathogens is the primary pathogen, and bacterial pathogens are secondary pathogens. including primary pathogen mainly include: porcine reproductive and respiratory syndrome virus (prrsv), mycoplasma pneumoniae (mhp), pig pseudo rabies virus (prv), swine influenza virus (siv), porcine circovirus type ⅱ virus (pcv - ⅱ), and a growing body of evidence indicates that pig pneumonia mycoplasma, pig pseudo rabies and blue-ear disease is the main cause of porcine respiratory disease syndrome a culprit, is also the most frequent and one of the most common pathogens, mycoplasma dependent on bronchial cilia, lead to the cilia mechanical filtering functions of air and removal of airway foreign body is damaged, can not effectively prevent air germs enter the respiratory tract and lungs; at the same time, as a form of immune inhibitory disease pathogens, mycoplasma infection, the ability of lymphocytes to produce antibodies to reduce, alveolar macrophages engulf weakened, resulting in a decline in cell immunity. other secondary pathogeny easily invaded, almost all mycoplasma pneumonia secondary infections are easily happened, especially in the mycoplasma pneumoniae infection blue-ear disease is most serious, when at the same time two pathogen infection, often severe respiratory disease, it is difficult to cure, high mortality, damage is also the most serious.
secondary pathogens are mainly bacterial diseases, such as bacilli, streptococcus suis, and haemophilus. environmental factors to cause the prdc plays an important role, the harmful gas in piggery overweight, day and night temperature difference is bigger, factors such as temperature and humidity can't balance to the body in a state of stress, so as to inspire the pathogen infection. the biggest characteristic of prdc is that the secondary infection is severe, most of which are the mixed infection caused by the co-action of pathogenic microorganisms such as bacteria and viruses. typical symptoms include cough, shortness of breath, severe mouth breathing a dog sitting posture, especially in 2-3 months pig multiple, mortality is 20% - 20%, pig growth performance, apparent weight slowly, population uniformity decline, consumption is expected to increase, chulanqi extended.
therefore, spring should strengthen the prevention of diseases from the aspects of feeding management, immunisation, drug prevention and daily disinfection. immunization, according to the monitoring situation of pig farms, set up a reasonable immunization programs, and the focus of the vaccine in swine fever, blue ear pig and pig pseudo rabies commodity seedlings, yongshun creatures as own duty, to provide high-quality vaccine to prevent and control prdc series of star products, "swine fever vaccine (extend the cell source)", "highly pathogenic porcine reproductive and respiratory syndrome virus (gdr180 strains)" and "crystal pseudo rabies vaccine. one of the simplest and most important measures to prevent and control prdc is to adopt strict all-around system of delivery, conservation and breeding. attach importance to the quality of feed, forbid feeding mildew feed; drug prevention is primarily a secondary and concurrent control of bacterial diseases in prdc, and so far, tylenol and titrin are the first drugs to prevent prdc.
the annual plan is in spring, the spring strictly prevent the occurrence of prdc, and lay a solid foundation for the health of the pigs, and ensure the improvement of the benefits. |
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