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Poult Sci. 2017 Jun 1;96(6):1884-1890. doi: 10.3382/ps/pew489.

In-ovo monochromatic green light photostimulation enhances embryonic somatotropic axis activity.

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Department of Animal Sciences, Hebrew University of Jerusalem, Robert H. Smith, Faculty of Agriculture, Food and Environment, Rehovot 76100, Israel.
Institute of Animal Science, ARO, the Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel.
Department of Animal and Avian Sciences, University of Maryland, College Park, Maryland 20742.
Department of Swine and Small Animal Breeding, Institute of Animal Sciences, University of Agriculture in Krakow, Krakow, Poland.


Previous studies demonstrated that in ovo photostimulation with monochromatic green light increases body weight and accelerates muscle development in broilers. The mechanism in which in ovo photostimulation accelerates growth and muscle development is not clearly understood. The objective of the current study was to define development of the somatotropic axis in the broiler embryo associated with in ovo green light photostimulation. Two-hundred-forty fertile broiler eggs were divided into 2 groups. The first group was incubated under intermittent monochromatic green light using light-emitting diode (LED) lamps with an intensity of 0.1 W\m2 at shell level, and the second group was incubated under dark conditions and served as control. In ovo green light photostimulation increased plasma growth hormone (GH) and prolactin (PRL) levels, as well as hypothalamic growth hormone releasing hormone (GHRH), liver growth hormone receptor (GHR), and insulin-like growth factor-1 (IGF-1) mRNA levels. The in ovo photostimulation did not, however, increase embryo's body weight, breast muscle weight, or liver weight. The results of this study suggest that stimulation with monochromatic green light during incubation increases somatotropic axis expression, as well as plasma prolactin levels, during embryonic development.


broiler; development; growth hormone receptor; in ovo photostimulation; somatotropic axis

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