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المصدر: Frontiers in veterinary science, vol 5, iss MAY
Frontiers in Veterinary Science, Vol 5 (2018)مصطلحات موضوعية: Veterinary medicine, medicine.medical_specialty, 040301 veterinary sciences, Longitudinal data, animal diseases, Porcine Reproductive and Respiratory Syndrome, Biology, 0403 veterinary science, Endemic Animal Disease, Epidemiology, medicine, Production (economics), Veterinary Sciences, Respiratory system, Sow Farms, Endemic disease, lcsh:Veterinary medicine, Fixed effects model, General Veterinary, Animal disease, 0402 animal and dairy science, Outbreak, 04 agricultural and veterinary sciences, Production Impacts, US Swine Industry, 040201 dairy & animal science, lcsh:SF600-1100
الوصف: Porcine reproductive and respiratory syndrome (PRRS) is an endemic disease causing important economic losses to the US swine industry. The complex epidemiology of the disease, along with the diverse clinical outputs observed in different types of infected farms, have hampered efforts to quantify PRRS’ impact on production over time. We measured the impact of PRRS on the production of weaned pigs using a log-linear fixed effects model to evaluate longitudinal data collected from 16 sow farms belonging to a specific firm. We measured seven additional indicators of farm performance to gain insight into disease dynamics. We used pre-outbreak longitudinal data to establish a baseline that was then used to estimate the decrease in production. A significant rise of abortions in the week before the outbreak was reported was the strongest signal of PRRSV activity. In addition, production declined slightly one week before the outbreak and then fell markedly until weeks 5 and 6 post-outbreak. Recovery was not monotonic, cycling gently around a rising trend. At the end of the study period (35 weeks post-outbreak), neither the production of weaned pigs nor any of the performance indicators had fully recovered to baseline levels. This result suggests PRSS outbreaks may last longer than has been found in most other studies. We assessed PRRS’ effect on farm efficiency as measured by changes in sow production of weaned pigs per year. We translated production losses into revenue losses assuming an average market price of $45.2/weaned pig. We estimate that the average PRSS outbreak reduced production by approximately 7.4%, relative to annual output in the absence of an outbreak. PRRS reduced production by 1.92 weaned pigs per sow when adjusted to an annual basis. This decrease is substantially larger than the 1.44 decrease of weaned pigs per sow/year reported elsewhere.
وصف الملف: application/pdf
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe04d35a9ddedcd5e5097fce80b73895
https://doi.org/10.3389/fvets.2018.00102