<![CDATA[Light plays an important role in the avian life. The present study was designed to evaluate the effects of monochromatic light on serum estrogen concentrations and profile the oviduct, that were the length and weight of the oviduct in the quail. Two hundred and seventy quails were divided into nine treatments of light, with ten replications and three quails in each replication. The treatments were without light, controls with 15 and 25 W, red, green, and blue lights with intensities of 15 and 25 lux. Control treatment used incandescent bulb.  The red,  green,  and  blue lights  were  provided  by  light emitting  diodes  (LED). All lights  treatment   were  given   for  14 h  daily,  started from 17.00 to 07.00. Parameters  measured were serum estrogen concentrations, and weights and lengths of   the oviduct on weeks 5,  7, and  9. Quails  exposed  to monochromatic  light had  higher  serum  estrogen  concentrations (P<0,05). Quails  exposed to monochromatic light had  better  weights and  lenghts of  the  oviduct  development. Blue light could be used to increase serum estrogen concentrations and stimulate shell gland development.]]>
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