Analysis of the causes of high incidence of swine
In recent years, the incidence of pigs is getting higher and higher, especially the respiratory diseases of pigs and infectious reproductive diseases of pigs have been increasing year by year. The clinical manifestations are mixed infections and secondary infections with multiple factors and multiple pathogens. The long course of disease and the diversification and complexity of symptoms have brought many difficulties to clinical diagnosis and prevention, causing great economic losses to pig owners. In particular, the epidemic of high fever has caused many pig farmers to suffer a lot of undue economic losses. To sum up, the increasing incidence of swine disease mainly has the following reasons: (1) Effects of immunosuppression Porcine reproductive and respiratory syndrome (PRRS) virus, porcine circovirus type 2, swine pseudorabies virus, swine fever virus, etc., result in low immunity of the herd, poor immune response after vaccination, overall disease resistance of the herd decline. At the same time, it is easy to cause mixed infections and secondary infections in pigs, and also causes multiple conditional diseases. In addition, the above-mentioned diseases are also the major diseases causing sow reproductive failure. (2) The presence of atypical swine fever The persistent infection and outward detoxification of swine fever virus in pig herds caused constant atypical swine fever. Sows' swine scrofula syndrome causes immune tolerance in piglets and piglets in piglets. The immunization against swine fever vaccine does not produce a good response, and it often dies in the late stages of lactation and early childcare. The presence of atypical swine fever also causes the pig's immune system to decline, often secondary to bacterial disease. (3) Stress is too large Stress is a global swine disease and it is the source of all diseases of pig farming. Feeding was highly concentrated, and the stocking density was too large. The sow's positioning and feeding lacked exercise and light, the pigs were frequently transported, the environment was harsh, and the site was heavily polluted. Scaring, catching, transporting, overcooling, overheating, crowding, mixed groups, lack of oxygen, infection, lack of nutrition, lack of water, broken materials, vaccination, castration, changes in feeding methods, replacement of feed, change of environment, replacement of breeders, High productivity, pain, poisoning, etc. (4) Overstocking density Excessive breeding density results in multiple diseases and transmission. There is an oversupply in each pen. Barriers are not enclosed walls that cause pigs to come into contact with their mouths (mouth contact is a way for pigs to express their feelings. Many contact sexually transmitted diseases are often transmitted in this way). A sick sire spreads pathogenic microorganisms to other pigs. If it is a physical partition, the spread through the mouth contact of the pig will be controlled in a small column. Some scholars have used dogs for interesting experiments: feeding more than 12 dogs within a square kilometer will cause the dog to become hot, and there will be no epidemic if 11 or fewer dogs are raised. Although it is a case, it also shows that the high density has an accelerating effect on the occurrence of infectious diseases. (5) Feed nutrition is not comprehensive and unbalanced Feed formula design is irrational, quality control during the procurement is not strict, there is no intensive cultivation during production, there is no strict inspection at the factory, resulting in poor feed quality. In addition, some raw materials for feed ingredients have high skill levels, which makes it more difficult to identify. Contaminated with bacteria, mold, poor quality fish meal, meat meal, bone meal, blood meal and feather meal. Fat oxidation and rancidity in the feed. In addition, non-protein nitrogen, such as melamine and urea, is added to the feed. The energy, amino acids, vitamins and minerals in the feed are insufficient and the ratio is not reasonable. In order to pursue the growth rate of pigs, excessive amounts of copper, iron, zinc and barium are added to the feed. Excessive addition of antioxidants, fungicides, flavors. Toxic heavy metals such as lead, cadmium, and mercury exceeded the standards. Stone powder, calcium hydrogen phosphate in the fluoride content seriously exceeded the fluorine content of more than 2000 mg / kg. In order to meet the market's demand for low-priced feeds, the positioning of product design is too low. Disposable Double Lumen Endobronchial Tube,Dlt High Volume Low-Pressure Cuff,Latex Free Dlt,Medical Pvc Double Lumen Endobronchail Tube Hangzhou Trifanz Medical Device Co., Ltd , https://www.cfzmed.com