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How does red light affect layer production, fear, and stress?

G S Archer1

  • 1Department of Poultry Science, Texas A&M University, 101 Kleberg, College Station, Tx 77845.

Poultry Science
|January 29, 2019
PubMed
Summary

Adding red light to LED bulbs for laying hens (Gallus gallus domesticus) reduced stress indicators. However, light spectrum did not impact production or fear responses in commercial layers.

Area of Science:

  • Animal Science
  • Poultry Science
  • Animal Behavior

Background:

  • Light-emitting diode (LED) bulbs offer energy efficiency and dimmability for layer production.
  • The impact of light spectrum on poultry welfare, including stress and behavior, is an area of ongoing research.

Purpose of the Study:

  • To investigate the effects of different light spectra on production, stress, and behavior in White Leghorn laying hens.
  • To compare the effects of white light with added red light (RED) versus solely white light (WHITE) on key production and welfare parameters.

Main Methods:

  • 108 White Leghorn hens per treatment (RED vs. WHITE light) were used across three replicates.
  • Production parameters (e.g., egg production, feed conversion, egg quality) were measured.
  • Fear response (tonic immobility, inversion) and stress indicators (corticosterone, H/L ratio, asymmetry) were assessed at multiple time points.

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Main Results:

  • No significant differences were observed in production parameters between the RED and WHITE lighting treatments.
  • Lighting type did not influence fear responses (tonic immobility, inversion).
  • Hens under RED light exhibited significantly lower plasma corticosterone, H/L ratios, and asymmetry scores from 42 to 72 weeks of age compared to WHITE light.

Conclusions:

  • Incorporating red light into the spectrum for laying hens can mitigate stress susceptibility.
  • Light spectrum, specifically the addition of red light, does not appear to affect production parameters or fear responses in White Leghorn layers.
  • Red light shows potential for improving layer welfare by reducing physiological stress indicators.