The effect of the electromagnetic spectrum as well as the efficiency of various wave (4000 to 7000 A) on growth and develop-lengths, require further investigation. More merit of avian gonadal tissue has been re-intensive work is also required on birds reviewed thoroughly by Withrow ( 1 ). H~~-ceiving no ocular illumination. The purpose ever, the wave length-intensity relationships, Of this research was to an inexpensive and relatively simple method for con-*This work was partially supported by Canada trolling wave length and light intensity for photoperiodic experiments with birds.
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