Effects of blue light at night on behavior, expression of clock genes, and the hypothalamus-pituitary-adrenal-axis in broiler chicks
2017
Hiramoto, D. (Kobe University, Kobe (Japan). Graduate School of Agricultural Science) | Honda, K. | Kondo, M. | Saneyasu, T. | Kamisoyama, H.
In the present study, the effects of blue light at night on behavior, expression of clock genes, and the hypothalamus-pituitary-adrenal (HPA) axis in broiler chicks were examined. One day old broiler chicks (Ross308) were maintained under 23 h light-1 h dark cycles (23L1D group) or 12 h light-5 h blue light-1 h dark-6 h blue light cycles (BL group) for 13 days. Significant changes were observed in the number of locomotions from 13 to 14 days of age in the 23L1D group, but not in the BL group. The mRNA levels of Bmal1 and Cry1 showed different changes between groups, whereas the mRNA levels of Per3 changed in a similar manner between groups. The mRNA levels of corticotropin-releasing factor in the diencepharon tended to increase after 18 : 00 in both groups. Plasma corticosterone concentrations were significantly changed in the 23L1D group, but not in the BL group. These results suggest that a change in light color can be used to regulate behavior, circadian changes in the expression of clock genes, and the plasma corticosterone concentration in broiler chicks.
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