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XTi Science
Trial of XTi PAWS on Hy-line W36 layer hen growth and production
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June 20, 2020

Trial of XTi PAWS on Hy-line W36 layer hen growth and production, 7/2019 – 6/2020

Internal XTi Trial

Conclusion: Exposure of Hy-line W36 laying hens to XTi’s pulsed alternating wavelength system (PAWS) resulted in faster bird growth and earlier onset of maximal egg production compared to the control and Hy-line W36 breed standard. XTi light recipes can also facilitate manipulation of egg production via changes in photoperiod and light intensity.

Study Objectives:

  • To evaluate the effect of XTi PAWS on growth and production of Hy-line W36 layer hens based on previous data from internal XTi trials as well as external commercial data.
  • To assess the impact of differing XTi recipe intensities on previously assessed metrics.


  • Previous studies on Hy-line W36 layer hens showed improved bird growth, egg production, and egg size distribution under XTi lighting.
  • The best recipes from internal XTi trials as well as early external commercial trial data were used to determine recipes for both growth and lay phases.
  • It was noted that ambient light at commercial facilities did not seem to negatively impact production of XTi lit birds.


  • The study was conducted at XTi’s research facility in northern Colorado.
  • 500 Hy-line W36 pullets were obtained from a supplier on day 2. The birds were placed into 13 pullet tents. Pullets were placed under either XTi lighting or control lighting.
  • XTi lighting was either 17hrs or 24hrs of light. Control lighting was set at 17hrs of light per industry standard.
  • Birds were started on “grow” light recipes and changed to “lay” light recipes at week 14.
  • Birds were transferred to lay battery cages at 10 weeks of age.
  • Data was collected until birds were 46wks old.
  • Birds were kept in commercial battery cages and fed standard 18% lay feed.


  • Birds under XTi grow recipes showed a 17% increase in weight over the Hy-line W36 breed standard at 14 wks.
  • Both 17hr and 24hr XTi lighting exceeded breed standard growth.
  • Birds under XTi lighting once again reached maximal production 1-2 weeks earlier than breed standard.
  • XTi recipe type, photoperiod, and light intensity all had an impact on egg production and egg size distribution.
  • Egg case weights of XTi lit birds increased early and remained steady throughout the trial period.


  • Previous trials had shown that XTI lighting can speed up early bird growth and sexual maturity. This trial confirmed those earlier results.
  • This trial showed that subtle recipe changes, photoperiod, and light intensity can all impact egg production and egg size distribution.
  • These results show that commercial producers could leverage light inputs to control flock outputs in a beneficial way.
  • No negative health outcomes were noted for the birds – consistent across all trials.
  • Animal behavior under XTi lighting is consistently improved: calmer, easier to handle birds.
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