ANFS332 Lecture Notes - Lecture 15: Herd Immunity, Estrous Cycle, Weaning
4 Feb 2020
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Porcine reproductive & respiratory syndrome (prrs) group exercise. Agalactica (failure to secret milk) and mastitis. Red/blue discoloration of the ears and vulva. Prrsv can also cause severe reproductive damage. Premature farrowings (producing a litter of pigs) by 2-3 days. Stillborn or mummified piglets (10-15% die in the last 3-4 weeks of pregnancy) Weak prrsv-positive piglets (50% die soon after birth) Once the acute disease has passed through the herd prrs virus normally then only becomes of significance in the early growing period, where severe endemic pneumonia can persist with periods of inappetence and wasting of pigs. Pigs become infected as maternal antibody disappears and then remain viremic for 3 to 4 weeks continually excreting virus. Permanently populated houses maintain the virus at high levels. Clinical disease is seen in pigs from 4 to 12 weeks of age and it is characterised by a fairly predictable time of onset, inappetence, malabsorption and wasting, coughing and pneumonia.
