A Method for Decreasing Sampling Variance in Bacteriological Analyses of Meat Surfaces ^{1, 2}

Area of Science:

• Food Microbiology
• Meat Science
• Hygiene and Sanitation

Background:

• Bacterial contamination on fresh meat surfaces exhibits high spatial variability.
• Inconsistent bacterial counts complicate accurate assessment of hygiene and sanitation effectiveness.
• Previous sampling methods may not adequately represent overall microbial load.

Purpose of the Study:

• To investigate the impact of rubbing fresh meat surfaces on bacterial plate count variability.
• To determine if this method reduces sample variance for improved microbial assessment.
• To assess the potential for fewer samples in hygiene studies of fresh beef.

Main Methods:

• Comparing bacterial plate counts from fresh beef surfaces before and after rubbing the surfaces together.
• Utilizing standard microbiological techniques for viable bacterial enumeration.
• Statistical analysis to evaluate the reduction in variance.

Main Results:

• Rubbing meat surfaces significantly reduced the variation in bacterial plate counts.
• Counts before rubbing ranged from 2 to 6,187/cm², while counts after rubbing ranged from 15 to 2,043/cm².
• The reduction in sample variance was statistically significant.

Conclusions:

• Rubbing fresh meat surfaces prior to sampling is an effective method to reduce bacterial count variability.
• This technique enhances the reliability of microbial assessments on meat surfaces.
• The reduced variance allows for more efficient sampling strategies in food safety and sanitation studies.