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9 Cards in this Set
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causes of low litter size
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d/t embryonic death < 35 d. gestation: resorption
suspect non-infectious cause if no other signs: regular returns to estrus, boar overuse, poor mating management |
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causes of mummies
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d/t embryonic death < 35 d. gestation: resorption
suspect non-infectious cause if no other signs: regular returns to estrus, boar overuse, poor mating management |
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PRRS
a. pathogenesis b. signs c. tx d. px |
a. infects MPs --> vasculitis
b. does not kill piglets!: interstitial pneumonia, mild fever, moderate depression, then recover; mortality d/t effects of 2º bacterial dz “immune” herds: abortions > 80 d., stillbirths, mummies, weak piglets, high pre-weaning mortality acute PRRS: sow abortion & mortality syndrome; d/t herd infection w/ new heterologous PRRS virus c. poor response to ABs, minimize cross fostering d. isolate new breeding stock for 120 d.: expose to herd’s PRRS virus, purchase only PRRS free semen |
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porcine parvovirus
a. epidemiology b. pathogenesis c. signs d. dx e. prevention |
a. ubiquitous
gilt litters typically affected sows immune for life b. attacks fetus only: no placentitis, no abortion c. SMEDI: stillbirths, mummies, embryonic death, infertility adults: no clinical dz d. test mummies for Ag or Ab e. vaccinate gilts twice before mating expose unmated new gilts in isolation |
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pseudorabies
a. epidemiology b. lesions c. signs |
a. pigs shed virus sporadically
transmisision: pig to pig (most important), fomites, aerosol, vertical (only during outbreaks) b. focal necrosis: lung, liver, tonsil, braini +/- placentitis: abortion, mummies (repro syndrome NOT common) c. all ages affected: dec. CNS signs, inc. pneumonia w/ age most severe in suckling piglets: marked CNS signs, high mortality, die w/in 2 d. sows off feed (ddx: TGE, mycotoxin, severe PRRS) |
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pseudorabies
a. dx b. tx c. prevention d. eradication |
a. virus isolation (tonsils, brain), differential ELISA,
serology: latex agglutination: detects early infection (test incoming gilts) b. none c. biosecurity vaccination: excellent for preventing outbreaks -vaccinate gilts before entry -revaccinate all gilts & sows 4x/yr d. differential ELISA: very sensitive & specific -test whole herd & remove carriers |
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circovirus-2
a. epidemiology b. signs c. dx |
a. repro syndrome reported in gilts only
b. abortions (mid to late term), stillbirths, mummies, viremic weak live born piglets c. PCR, immunohistochemistry, virus isolation on fetuses & newborn pigs |
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leptospirosis
a. signs b. dx c. tx d. prevention |
a. sows: often no signs, abortion 1-4 w. later (mid to late gestation)
birth of weak, squealing piglets; stillborns b. darkfield microscopy (stomach contents), immunohistochemistry (kidneys) paired serology (commonly no rising titers) c. high doses of tetracycline (not done) d. vaccination: twice pre-breeding |
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brucellosis
a. epidemiology b. signs |
a. nearly eradicated, mainly affects feral pigs
b. abortion at any stage of gestation poor conception rates after abortion |
