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A case study of ventilation shutdown with the addition of high temperature and humidity for depopulation of pigs.
J Am Vet Med Assoc ; 259(4): 415-424, 2021 08 15.
Article in English | MEDLINE | ID: covidwho-1337606
ABSTRACT
CASE DESCRIPTION In February 2020, a swine farm operating in multiple states throughout the Midwest began to evaluate emergency plans to respond to potential impacts of the COVID-19 pandemic. CLINICAL

FINDINGS:

From February through April, extensive mitigation strategies were implemented in anticipation of market disruption. The farm consulted the AVMA Guidelines for the Depopulation of Animals to identify preferred methods for depopulation of swine; however, none of these methods were feasible. When the first US packing plant closed in April 2020 because of human COVID-19 infection, the farm began to evaluate whether ventilation shutdown plus (VSD+) could be used for depopulation. TREATMENT AND

OUTCOME:

Through proof-of-concept trials, a method for ventilation shutdown with the addition of supplemental temperature and humidity was developed. A single location with 4 barns that could be retrofitted for the process was selected, and between April and June 2020, 243,016 pigs were depopulated (59,478 nursery and 183,538 finishing pigs). Mean ± SD time to silent (the time when no sounds could be heard and no motion seen) was 55.4 ± 14.5 minutes for the nursery pigs and 65.0 ± 18.1 minutes for the finishing pigs. Only 728 (0.300%) pigs required manual euthanasia at the end of the depopulation process. CLINICAL RELEVANCE Efficacy exceeded AVMA recommendations for the use of VSD+ (> 95% mortality rate in < 1 hour). Findings could potentially guide the use of this method for mass depopulation in the event of a foreign animal disease outbreak or severe market disruption in the future.
Subject(s)

Full text: Available Collection: International databases Database: MEDLINE Main subject: Swine Diseases / COVID-19 Type of study: Case report / Experimental Studies / Observational study / Prognostic study Limits: Animals / Humans Language: English Journal: J Am Vet Med Assoc Year: 2021 Document Type: Article

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Swine Diseases / COVID-19 Type of study: Case report / Experimental Studies / Observational study / Prognostic study Limits: Animals / Humans Language: English Journal: J Am Vet Med Assoc Year: 2021 Document Type: Article