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Optimized Ex-ovo Culturing of Chick Embryos to Advanced Stages of Development
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Temperature manipulation during layer chick embryogenesis.

I Walstra1, J Ten Napel, B Kemp

  • 1Adaptation Physiology Group, Wageningen University, PO Box 338, 6700 AH Wageningen, the Netherlands. irene.walstra@wur.nl

Poultry Science
|June 16, 2010
PubMed
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Temperature manipulation during embryogenesis altered temperature preference and heat response in young layer chicks, but these effects were temporary, lasting only until 8 days post-hatch. This study offers insights into early life thermal conditioning in poultry.

Area of Science:

  • Poultry Science
  • Animal Physiology
  • Environmental Adaptation

Background:

  • Temperature manipulation (TM) during embryogenesis is studied primarily in broilers.
  • Its effects on posthatch environmental adaptation in layer chicks remain largely unexplored.
  • Understanding TM effects is crucial for optimizing poultry welfare and performance.

Purpose of the Study:

  • To investigate the impact of late-embryonic temperature manipulation on layer chicks.
  • To assess effects on temperature preference, response to heat, behavior, and performance.
  • To determine the duration of these effects post-hatch.

Main Methods:

  • Embryos were exposed to controlled temperatures (37.8°C) or thermal manipulation (40°C for 4h/d, embryonic days 14-18).

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  • Post-hatch chicks underwent temperature preference tests and thermal challenges at 1, 7, and 33 days of age.
  • Behavioral tests (tonic immobility, home pen observations) were conducted.

    • Main Results:

    • TM reduced incubation time and body temperature at hatch.
    • TM chicks showed altered temperature preference and higher body temperature responses to heat challenges up to day 8.
    • No significant effects of TM on chick behavior or performance were observed.

    Conclusions:

    • Late-embryonic TM influences early posthatch thermoregulation in layer chicks.
    • These effects are transient, primarily observed up to 8 days of age.
    • Further research is needed to optimize TM protocols or understand limitations in layer breeds.