Temperature sequence of eggs from oviposition through distribution: processing--part 2

Area of Science:

• Food Science
• Agricultural Science
• Microbiology

Background:

• The 1999 Egg Safety Action Plan highlighted the need to re-evaluate egg temperature data in risk models.
• Previous assessments may not have fully accounted for seasonal and geographical variations in egg temperatures.

Purpose of the Study:

• To determine the internal and external temperature profiles of eggs from oviposition through distribution.
• To analyze how season and geographic location influence egg temperatures during processing and cooling.

Main Methods:

• A national study collected egg temperature data from commercial production, processing, and distribution facilities.
• A mixed-effects model analyzed temperature variations based on season, geographic region, and operation type (inline/offline).
• Internal and external egg temperatures were recorded at various stages, including pre- and post-processing cooling.

Main Results:

• Significant season x geographic region interactions affected both surface and internal egg temperatures (P < 0.05).
• Egg temperatures were consistently higher in summer than in winter, with increased temperatures during shell egg processing.
• While cooling rates were similar, internal temperatures were higher in summer in both pre- and post-processing cooler areas.

Conclusions:

• Seasonal and geographical factors demonstrably influence egg temperatures throughout the processing chain.
• These temperature variations must be incorporated into future egg safety risk assessments for improved accuracy.
• The findings underscore the dynamic nature of egg temperature and its implications for food safety protocols.