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The effect of vaccination and use of commercial immunostimulants on the prevalence of PMWS in a Pig Herd

by 5m Editor
1 January 2003, at 12:00am

By Daniel Hurnik, Industry Chair for Swine Research, University of Prince Edward Island - This article reports on a study whose objectives were to investigate the hypothesis that stimulation of the immune system, either specifically with a vaccine against Mycoplasma hyopneumoniae or non-specifically with two immuno-modulating compounds (Emulsigen®, and AlhydrogeTM) or an immunoglobulin supplement (SoluteinTM) can influence the clinical and pathological expression of post-weaning multisystemic wasting syndrome (PMWS) in growing pigs naturally infected with PCV-2.

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EXECUTIVE SUMMARY

  • The pigs treated with the Aluminum hydroxide adjuvant had significantly more cases of PMWS than pigs that only received a saline control injection
  • Pigs that were lighter on entry to the barn had a higher risk of dying with PMWS than heavier pigs
  • Pigs that grew up on the slatted floor had a higher risk if developing PMWS, but pigs on the slatted floor also were lighter, it is not apparent thus if it is a floor effect or a startweight effect.
  • Barrows had a trend toward a higher risk of PMWS, but it was not statistically significant.
  • The only significant impact on backfat was both the gender and the carcass weight. None of the treatments had any significant impact on the backfat of the animals.
  • The only significant impact on loin depth is the weight of the carcass. There was no treatment impact on loin depth or degree of muscling of the pigs
  • Both the carcass lean yield and the index are a function of the loin eye depth and the backfat and there was no impact on either due to treatments
To read the complete research report (13 page PDF file) Click Here
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Source: Atlantic Swine Research Partnership - December 2002
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