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Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...

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In Ovo Electroporations of HH Stage 10 Chicken Embryos
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Temperature sequence of eggs from oviposition through distribution: processing--part 2.

K W Koelkebeck1, P H Patterson, K E Anderson

  • 1Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana 61801, USA. kkoelkeb@uiuc.edu

Poultry Science
|May 22, 2008
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Summary

Egg temperatures vary significantly by season and region, impacting food safety models. Understanding these temperature fluctuations is crucial for accurate risk assessments in egg processing.

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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.