Detailed Explanation of Differential Diagnosis and Prevention and Control Measures for Sow Reproductive Disorders (2)
Differential Diagnosis and Prevention and Control Measures for Sow Reproductive Disorders (2)
Stillbirth and placental changes: porcine Japanese encephalitis causes fetal hydrocephalus and subcutaneous edema; toxoplasmosis and swine fever produce malformed fetuses; brucellosis causes fetal ascites, subcutaneous edema and purulent placenta; in porcine leptospirosis and brucellosis, stillbirths rarely become mummified; in swine fever, necropsy shows button ulcers at the ileocecal junction and hemorrhagic infarction at the spleen margin; porcine reproductive and respiratory syndrome (PRRS) shows varying degrees of pulmonary congestion and edema, with the lung tissue presenting diffuse brown lesions.
4 Prevention and ControlMeasures
There are currently no goodtreatmentdrugs for swine reproductive disorders; prevention mainly relies on vaccination. Prevention of porcine parvovirus: first-litter sows and growing boars are vaccinated 1 to 2 months before mating. Prevention of Japanese encephalitis: gilts are injected with attenuated or inactivated vaccine at 5 to 6 months of age, twice a year, while other pigs should be injected with inactivated vaccine one month before the epidemic season arrives. Prevention of porcine pseudorabies: sows are vaccinated about 1 month before mating and before farrowing. Prevention of swine fever:breeding pigsare vaccinated once every six months, and piglets are immunized twice at around 20 and 60 days of age; in areas where swine fever is prevalent, super-early immunization is used. Prevention of brucellosis: quarantine and monitoring are carried out at least once a year, and once detected, animals are culled immediately.
For porcine leptospirosis,treatment: when diseased pigs are found, streptomycin or gentamicin can be injected intramuscularly and the pigs isolated fortreatment, with oxytetracycline added to the feed, about 1 gram per kilogram of feed. Prevention andcontroltreatment of porcine toxoplasmosis: cats are prohibited from being kept on pig farms; mixing sulfamonomethoxine into the feed for 3 to 5 days can prevent the disease, and sulfonamide drugs can also be injected intramuscularly fortreatment。