| China is a large pig bredding country. According to 2015 data, the consumption of pork was 57.425 million tons, 52% of pork consumption of the world belongs to China; expected annual pig slaughter 16 590 million, accounting for 51 percent of the world slaughter pigs. But our hog production level with the world's advanced level still has a big gap: pig herds and slaughter rate and more: China's current pig population sow 36 million, an average annual per head sow slaughter 15 to 16 piglets, the piglets production level of developed countries is 25 per year, our country is far less than this level; 2015 slaughter of 500 commercial pigs pig farms accounted for 44%, while the United States in 2009, the slaughter of more than 5000 scale commercial pig farms accounting for more than 62%. Our pig technology needs to be improved, which increase the number of child births per sow, reduce piglet mortality is a top priority.Before and after the 2013 and 2015 Spring Festival, the domestic(especially Jilin, Jiangxi, Anhui, Shanxi, Hebei, Shandong and other places) a large area sows reproductive disorders and other diseases; piglets, nursery also faces the respiratory system and digestive diseases, yet no effective prevention and treatment measures. In view of this situation, I visited a number of Jilin swine and pig retail, select a representative scale sow farm, from history, epidemiological investigation, clinical examination, autopsy and pathological tissue observation, laboratory analysis and differential diagnosis, a comprehensive analysis of the causes and prevention of epidemic comprehensive measures.Medical history and epidemiological investigation showed that the sow farm no significant history of disease. Lactating sow diarrhea epidemic that occurred in this outbreak is seasonal, non-infectious. Feeding conservation materials boar nursery and feeding boars are not expected incidence. The incidence of epidemic characteristics is consistent with previous outbreaks. After the last piglets diarrhea outbreak, according to the feed mycotoxin poisoning prevention programs, the epidemic has been effectively controlled. Piglets incidence of antimicrobial drugs and emergency immunization had no significant effect, in accordance with piglets yellow dysentery and classical swine fever, swine pseudo rabies prevention and control program is invalid. Corn and feed sources of procurement changeable, storage unreasonable, Big Corn dusty surface.Clinical examination showed a small birth weight piglets, gilts vulva swelling, indigestion after eating colostrum beginning, yellow-white curd-like discharge loose stools, individual piglets vomit, walking shaking, difficulty standing, whole body contamination, and finally dehydration failure and death, high mortality, using a variety of antibiotics ineffective. Maternal lactation weak, coarse hair disorder, front and sides of the symmetry of hair removal, some sows miscarriage, stillbirth. Sows tears severe plaque individual sow tarsal joints, hip swelling, crown hoof hoof crack. Fattening gray fur, urine yellow, thrown to actively chew stones and chains, often creeping, fighting and so on. Boars and nursery is normal.Pathological examination and histopathological observation showed that piglets skin filthy, emaciated, with signs of dehydration, female piglets vulva was pink, inguinal lymph congestion, bleeding, stomach empty, stomach contents white, milk clot such as residue Thus, congestion pyloric glandular region, pyloric glandular region mucosa shedding, intestinal emptiness, blow, meager intestinal wall, mesenteric lymph nodes, thoracic duct emptiness, no white lymph, liver, dark in color, greasy feeling. Bile thick, granular deposition, renal cortical surface of the needle-point bleeding, renal papillary renal slight deposits of blood, bleeding. Above pathological examination results indicate that piglet's digestive system was severely damaged. Histopathological results showed that liver S1, S2, S3, S4 are inflammatory cell infiltration, lobular ill. Renal visible inflammatory cell infiltration, some tubular autolyzed, kidney S3, S4 than the S1, S2 more inflammatory cell infiltration. Myocardial fibers arranged in close, no exceptions. Spleen, lung, brain normal.Antibody laboratory test results showed that the sow swine fever immunization failure, low levels of antibody lactating sows, piglets lactation maternal antibodies affected by swine fever antibody levels with age increases. The sow reasonable pseudo-rabies vaccination program, successfully immunized piglets for the first time, after the second immunization pseudo-rabies vaccine to protect power drops, the need to strengthen immunity, and make protective isolation and other precautionary measures. The sow herd PRRS antibody in line with changes of PRRS stability fields, indicating that no sow farm PRRS field virus infection. The sow farm porcine circovirus type 2 immune successful lactation piglets immune failure, increases with age piglets circovirus type 2 Anti-examination positive rate decreased, indicating the presence of immunosuppressive diseases piglets.Laboratory test results showed that antigen, 4 Aberdeen Pig Epidemic diarrhea, TGEV and FMD antigens were negative, indicating porcine epidemic diarrhea sow the field did not occur, foot and mouth disease and porcine transmissible gastroenteritis popular.Laboratory test results of corn and feed six kinds of mycotoxins: The test sample, in addition to aflatoxin B1 and ochratoxin A contamination level does not exceed the national standards, deoxynivalenol, T-2 toxin, fumonisin contamination exceeded the national standard. The sow feed mycotoxin pollution will lead to a series of pigs mycotoxin poisoning symptoms, the proposed replacement of moldy feed, and make prevention and control measures as soon as possible to relieve the adverse effects caused by mycotoxins.By the above diagnostic methods and results, investigate the causes and diagnosis sow farm and prevention measures in this outbreak, confirmed the sow suckling piglets because mycotoxin poisoning death and replacement by taking high-quality feed, a lot of fluid, Paul liver and kidney and other methods to effectively control the epidemic situation, the cause of research in recent years reached a sow suckling piglets severe diarrhea Jilin purposes. |
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