Røsæg Magnus Vikan, Garseth Åse Helen, Brynildsrud Ola Brønstad, Jansen Mona Dverdal
SalMar Farming AS, Brattørkaia 15B, 7010 Trondheim, Norway; Department of Food Safety and Infection Biology, Norwegian University of Life Sciences, Ullevålsveien 72, 0454 Oslo, Norway.
Norwegian Veterinary Institute, Ullevålsveien 68, 0454 Oslo, Norway.
Prev Vet Med. 2019 Aug 1;169:104699. doi: 10.1016/j.prevetmed.2019.104699. Epub 2019 May 31.
Pancreas disease (PD), caused by several subtypes of salmonid alphavirus (SAV), is associated with significant economic losses in European salmonid aquaculture. In this retrospective cohort study, we investigate the impact of PD caused by SAV subtype 2 (SAV2) on growth, feed conversion, and mortality in farmed Atlantic salmon (Salmo salar L.). The study was based on harvest data from a large salmon farming company operating in the SAV2 endemic area of Norway. Mixed-effect regression analyses showed a severe impact on both growth and feed conversion when PD appeared late in the production cycle. In a scenario with fixed slaughter time the estimated impact corresponded to a growth reduction of 0.7 kg and 0.07 points increase in feed conversion ratio. No effect on mortality was observed in this data set. In conclusion, the most important consequences of PD caused by SAV2 infection is reduced growth and feed conversion in large Atlantic salmon. The lack of effect on mortality in this study may be due to other factors overshadowing the impact of PD.
胰腺疾病（PD）由鲑鱼α病毒（SAV）的几种亚型引起，在欧洲鲑鱼养殖中会造成重大经济损失。在这项回顾性队列研究中，我们调查了由SAV2亚型（SAV2）引起的PD对养殖大西洋鲑（Salmo salar L.）生长、饲料转化率和死亡率的影响。该研究基于挪威SAV2流行地区一家大型鲑鱼养殖公司的收获数据。混合效应回归分析表明，当PD在生产周期后期出现时，对生长和饲料转化率均有严重影响。在固定屠宰时间的情况下，估计的影响相当于生长减少0.7千克，饲料转化率提高0.07个百分点。在该数据集中未观察到对死亡率的影响。总之，SAV2感染引起的PD的最重要后果是大型大西洋鲑的生长和饲料转化率降低。本研究中对死亡率缺乏影响可能是由于其他因素掩盖了PD的影响。
