Impact of a porcine epidemic diarrhea outbreak on swine productivity in Japan: a retrospective cohort study

YAMANE, Itsuro; YAMAZAKI, Hisanori; ISHIZEKI, Sayoko; WATANABE, Yugo; OKUMURA, Hanako; OKUBO, Mitsuharu; KURE, Katsumasa; HAYAKAWA, Yuiko; FURUKAWA, Makoto; OOI, Munetaka; MIZUKAMI, Yoshihiro; ITO, Mitsugu

The difference in MP between the PED-negative and L-PED-positive herds in October-December 2014 was 3.88 pigs/sow/year, which was equivalent to 0.97 pigs/ sow/3 months. During October-December 2014, the average price of marketed pigs in the L-positive-herds was $332/pig (data not shown). Therefore, the estimated average loss for an L-PED-positive herd caused by the PED outbreak, based only on the fewer pigs marketed, is estimated to be $314/sow ($322 × 0.97). Using the mean AFI (1,259) for the L-PEDpositive herds, the estimated average loss from the reduced MP caused by the PED outbreaks per L-PED-positive herd was $395,326 ($314/sow ×1,259), which is a significant loss for pig producers. In addition to the losses mentioned above, the potential reduced productivity described by the reduced daily weight gain and feed conversion rate have been reported previously [1] . Other indirect losses, including the costs of vaccines and disinfectants, animal movement restrictions and additional labor cost for disease control, were also estimated.