Furutani Aina, Sekiguchi Satoshi, Sueyoshi Masuo, Sasaki Yosuke
Course of Animal and Grassland Sciences, Graduate School of Agriculture, University of Miyazaki, Miyazaki, Japan.
Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, Miyazaki, Japan; Center for Animal Disease Control, University of Miyazaki, Miyazaki, Japan.
Prev Vet Med. 2019 Aug 1;169:104710. doi: 10.1016/j.prevetmed.2019.104710. Epub 2019 Jun 18.
Porcine epidemic diarrhea (PED) is an emerging and/or re-emerging disease of pigs in several countries, with high morbidity and mortality in suckling piglets. Farms affected with PED perform various intervention practices to control and/or eliminate the PED virus. The objectives of the present study were to assess the effect of biosecurity measures and intervention practices to control PED on time to absence of clinical signs (TAC) and number of dead suckling piglets during TAC. A questionnaire was administered to 120-PED affected farms located across Japan between 2013, when the first case was reported in Japan, and 2014. Farms were asked to provide information on farm characteristics and internal or external biosecurity measures during PED outbreak, as well as on intervention practices to control PED. The TAC was defined as the number of days from the date that clinical PED signs appeared to the date that clinical PED signs disappeared. The number of dead piglets per sow (DP/S) was calculated as the number of dead suckling piglets during TAC divided by the sow inventory. Regarding the effect of biosecurity measures during PED outbreak on TAC and DP/S, longer TAC was observed in Actinobacillus pleuropneumoniae-positive farms and farms outsourcing pig transport to the slaughterhouse (p < 0.05). In addition, farms with divided truck entrances had lower DP/S than those without divided entrances (p < 0.05).Regarding the effect of intervention practices to control PED on TAC and DP/S, farms that performed feedback at 2 weeks or later after PED outbreak had longer TAC and higher DP/S than other farms (p < 0.05). Farms that fixed the hours staff worked in farrowing barn had lower DP/S than the other farms (p < 0.05). In conclusion, variables associated with long TAC were Actinobacillus pleuropneumoniae -positive farms, farms outsourcing pig transport to the slaughterhouse, and farms performing feedback at 2 week or later after PED outbreak. Additionally, those associated with high DP/S were farms without divided entrances, farms without a fixed hours worked in the barn, and farms that performed feedback at 2 week or later after PED outbreak.
猪流行性腹泻（PED）是几个国家中一种新出现和/或再次出现的猪病，在哺乳仔猪中具有高发病率和高死亡率。受PED影响的猪场采取了各种干预措施来控制和/或消除PED病毒。本研究的目的是评估生物安全措施和控制PED的干预措施对无临床症状时间（TAC）以及TAC期间哺乳仔猪死亡数量的影响。在2013年（日本报告首例病例的年份）至2014年期间，对日本各地120个受PED影响的猪场进行了问卷调查。要求猪场提供有关猪场特征以及PED疫情期间内部或外部生物安全措施的信息，以及控制PED的干预措施的信息。TAC定义为从临床PED症状出现之日到临床PED症状消失之日的天数。每头母猪的死亡仔猪数（DP/S）计算为TAC期间哺乳仔猪死亡数除以母猪存栏数。关于PED疫情期间生物安全措施对TAC和DP/S的影响，在胸膜肺炎放线杆菌阳性猪场以及将猪运输外包给屠宰场的猪场中观察到TAC更长（p<0.05）。此外，有分隔卡车入口的猪场的DP/S低于没有分隔入口的猪场（p<0.05）。关于控制PED的干预措施对TAC和DP/S的影响，在PED疫情爆发后2周或更晚进行反馈的猪场的TAC更长，DP/S高于其他猪场（p<0.05）。在产仔舍固定员工工作时间的猪场的DP/S低于其他猪场（p<0.05）。总之，与TAC长相关的变量是胸膜肺炎放线杆菌阳性猪场、将猪运输外包给屠宰场的猪场以及在PED疫情爆发后2周或更晚进行反馈的猪场。此外，与DP/S高相关的是没有分隔入口的猪场、在猪舍没有固定工作时间的猪场以及在PED疫情爆发后2周或更晚进行反馈的猪场。
