We research the influence of monochromatic red (<$E lambda sub max> = 630 nm), blue (<$E lambda sub max> = 470 nm), and green (<$E lambda sub max> = 520 nm) light of laser light-emitting diodes on the early embryo development of Japanese Quail by the number of the differentiated pairs of somites which were generated by the 38-th hour of incubation. It is shown that red and blue lights at the intensity of a light beam of 0,1 mW/<$E roman cm sup 2> increases the number of the differentiated pairs of somites by 20,43 % (and 15,18 %, respectively) at the optimum temperature of incubation and by 27,62 % (and 38,48 %, respectively) at a lower temperature as compared with control group. A significant reduction of the number of the differentiated pairs of somites by 24,61 % (31,26 %) at the optimum temperature of incubation was observed at the intensity of red and blue lights of 1 mW/<$E roman cm sup 2>. Green light at a similar intensity did not influence somitogenesis.

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