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Relationships between processing delay and microbial load of broiler neck skin samples.

A Lucianez¹, M A Holmes, A W Tucker

¹Hallmark Meat Hygiene, Ltd., The Old Forge, Tetbury Street, Minchinhampton, Gloucestershire GL6 9JG, UK.

Journal of Food Protection

|January 7, 2010

Summary

Delayed poultry processing significantly increases total viable count and coliforms, but not Staphylococcus aureus or Pseudomonas. This highlights variability in microbial load, preventing definitive processing delay limits.

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Area of Science:

Food Safety and Microbiology
Poultry Processing Science

Background:

Microbial load on poultry carcasses is influenced by farm origin, processing hygiene, and ambient temperature.
Understanding the impact of processing delays on carcass microbial contamination is crucial for food safety.

Purpose of the Study:

To investigate the association between progressive processing delays and microbial load on poultry carcasses.
To quantify changes in specific bacterial populations (total viable count, coliforms, S. aureus, Pseudomonas spp.) over an 8-hour delay period.

Main Methods:

30 poultry carcasses were subjected to delayed processing (1-8 hours) at ambient temperature after defeathering and before evisceration.
Microbial analysis (total viable count, coliforms, S. aureus, Pseudomonas spp.) was performed on neck skin samples post-chilling.
Sampling was conducted over 5 days, with data pooled for analysis.

Main Results:

A significant increase in total viable count (P=0.001) and coliforms (P=0.004) was observed with extended processing delays up to 8 hours.
No significant changes were detected in Staphylococcus aureus or Pseudomonas spp. loads.
Significant variation in microbiological data was noted across different sampling days.

Conclusions:

An 8-hour delay in poultry processing leads to a measurable decline in the microbiological status of defeathered carcasses.
The high variability in results, due to numerous influencing factors, precludes establishing definitive maximum or minimum acceptable processing delay periods based solely on microbial criteria.