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Bacteria counts in sawdust bedding

J S Hogan1, K L Smith

  • 1Ohio Agricultural Research and Development Center, Ohio State University, Wooster 44691, USA.

Journal of Dairy Science
|August 1, 1997
PubMed
Summary
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Adding lime to sawdust bedding significantly reduces bacteria, including mastitis pathogens, for up to one day. Daily bedding replacement had minimal impact on bacteria levels in this study.

Area of Science:

  • Animal Science
  • Microbiology
  • Environmental Health

Background:

  • Bacterial contamination in animal bedding can increase the risk of mastitis.
  • Sawdust bedding is commonly used but can harbor significant bacterial loads.
  • Effective bedding management is crucial for dairy cow health.

Purpose of the Study:

  • To evaluate the impact of lime treatment and daily bedding replacement on bacterial counts in sawdust bedding.
  • To assess the relationship between bedding bacteria and teat skin contamination.
  • To determine the efficacy of lime in reducing mastitis pathogens in dairy cow stalls.

Main Methods:

  • Bacteria counts (Gram-negative, coliforms, Klebsiella spp., streptococci) were measured in sawdust bedding under three conditions: untreated, lime-treated, and daily replacement.

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  • pH and dry matter content of bedding were analyzed.
  • Teat skin swabs were collected to assess bacterial contamination.
  • Correlation between bedding bacteria and teat swabs was examined.

    • Main Results:

    • Lime treatment significantly reduced Gram-negative bacteria, coliforms, Klebsiella spp., and streptococci in new bedding.
    • Lime-treated sawdust showed lower bacteria counts than daily replaced or control bedding after 1 day.
    • Increased bedding pH correlated with decreased bacterial populations.
    • Teat swabs had lower Gram-negative bacteria and Klebsiella spp. counts for cows on lime-treated bedding after 2 days.
    • Daily bedding replacement had minimal effect on bacteria counts in bedding and on teat skin.

    Conclusions:

    • Lime treatment effectively reduces bacterial load and exposure to mastitis pathogens in sawdust bedding for at least one day.
    • Lime's efficacy is linked to increased bedding pH.
    • Daily bedding replacement is less effective than lime treatment for controlling bacterial contamination.
    • Lime-treated sawdust bedding can help decrease teat exposure to environmental mastitis pathogens.