The objectives of this study were to assess abortion risk (AR) and the number of piglets that died during suckling periods per litter (DP) in farms infected with porcine epidemic diarrhea (PED) in relation to herd immunization procedures. Data were obtained from 91 farms in Japan that had PED infection during 2013 to 2014. The 91 PED-positive farms were asked the number of abortions that occurred and DP for 3 months (1 month before PED outbreak (previous month), 1 month after PED outbreak (the month of PED), and from 1 month after PED outbreak to 2 months after PED outbreak (following month)). AR in each month was calculated as the number of abortions divided by sow inventory. Both AR and DP in the month of PED were higher than those in the previous and following months (p < .05). Farms that performed a herd immunization procedure had higher AR and DP in the month of PED than those that did not perform the procedure (p < .05). In summary, PED occurrence increased AR and DP.

中文翻译：

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日本商品化猪场感染猪流行性腹泻病毒的母猪流产风险评估

本研究的目的是评估流产风险 (AR) 和在感染猪流行性腹泻 (PED) 的农场中每窝哺乳期间死亡的仔猪数量 (DP) 与畜群免疫程序的关系。数据来自日本 2013 年至 2014 年期间发生 PED 感染的 91 个农场。询问 91 个 PED 阳性农场发生的流产次数和 3 个月（PED 爆发前 1 个月（上个月），爆发后 1 个月）的 DP PED爆发（PED月份），PED爆发后1个月至PED爆发后2个月（次月））。每个月的 AR 计算为流产数除以母猪库存。PED 月份的 AR 和 DP 均高于之前和之后的月份 (p < .05)。执行群体免疫程序的农场在 PED 月份的 AR 和 DP 高于未执行该程序的农场 (p < .05)。总之，PED 的发生增加了 AR 和 DP。