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Related Experiment Videos

Improved performance of a large pig complex after sequential nursery depopulation

S A Dee1, H S Joo, D D Polson

  • 1Department of Clinical and Population Sciences, College of Veterinary Medicine, University of Minnesota, St Paul 55108, USA.

The Veterinary Record
|January 13, 1996
PubMed
Summary

Nursery depopulation significantly improved pig farm productivity and financial returns, generating over $1.7 million by increasing marketable pigs and reducing antibiotic use. This strategy effectively addressed poor performance linked to porcine reproductive and respiratory syndrome virus (PRRSV).

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Area of Science:

  • Veterinary Medicine
  • Animal Science
  • Swine Production

Background:

  • Five large pig farms experienced persistent poor post-weaning performance for 12 months.
  • These farms were previously infected with porcine reproductive and respiratory syndrome virus (PRRSV).

Purpose of the Study:

  • To compare the productivity and financial benefits of nursery depopulation in a multi-farm complex.
  • To assess the impact of sequential nursery depopulation on pig performance, mortality, and PRRSV seroprevalence.

Main Methods:

  • Sequential depopulation, cleaning, and disinfection of nurseries on four farms over four weeks.
  • Relocation of pigs to available fattening facilities on a central farm (farm 3).
  • One-year assessment of nursery performance, mortality rates, and PRRSV antibody seroprevalence.

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Main Results:

  • A net financial benefit of $1,708,431 was assessed for the farm complex.
  • Significant improvements in nursery growth rate and reduced mortality were observed on depopulated farms (1, 2, 4, 5).
  • PRRSV antibodies were detected in farms 3 and 4, but not in farms 1, 2, and 5, suggesting potential viral maintenance in farm 3.

Conclusions:

  • Nursery depopulation is a financially beneficial strategy for improving swine production in PRRSV-affected complexes.
  • Maintaining PRRSV-positive status in shared facilities (farm 3) may hinder complete virus eradication and pose a risk to other farms (farm 4).
  • Strategic depopulation requires careful management of shared facilities to prevent viral reintroduction and ensure farm complex health.