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- W4239331376 abstract "Abstract Background: Effect of monochromatic green light illumination on embryo development has been reported in chickens. The avian pineal is an important photo-endocrine organ formed by a mediodorsal protrusion of the rudiment during embryonic development. However, the involvement of pineal gland in the lighting transducing process remain to beelucidated.In the present study, we investigated the influence of monochromatic green light on hatching time and explored the possible mechanism via pineal function. Results : A total of 600 eggs were incubated underphotoperiods of either 12 h of light and 12 h of darkness using monochromatic green light (12L:12D group) or 24 h of darkness (0L:24D group)for 18 d, with two replicates for each treatment. As compared to 0L:24D group, the green light stimulation shortened the hatching time without extending the hatch window or impairing hatchability. The liver of embryos incubated in the 12L:12D light condition was heavier than those of the 0L:24D group on d 21 post incubation. Meanwhile, the green light increased the serum concentration of insulin-like growth factor 1 (IGF-1), which is primarily secreted by the liver. Histological structure analysis of pineal gland demonstrated that the light stimulation increased follicle area, wall thickness and lumen area on d 10 and d 12 post incubation. Rhythmic function analysis demonstrated that three clock related genes ( brain and muscle ARNT-like-1 , BMAL1 ; circadian locomotor output cycles kaput , CLOCK ; and cryptochrome-1 , CRY1 ) and a melatonin rate-limiting enzyme related gene ( Arylalkylamine N-acetyltransferase , AANAT ) were rhythmically expressed in the pineal gland of the 12L:12D group, but not in that of the 0L:24D group. Simultaneously, the light stimulation also increased the concentration of melatonin (MT), which was linked to hepatocyte proliferation and IGF-1 secretion in previous studies. Conclusions : The 12L:12D monochromatic green light stimulation during incubation shortened hatching time without impairing hatching performance. Pineal gland’s early histological development and maturation of its rhythmic function were accelerated by the light stimulation. It may be the key organ in the photo-endocrine axis that regulates embryo development, and the potential mechanism could be that its higher secretion product of MT in the 12L:12D group promotes the secretion of IGF-1." @default.
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- W4239331376 date "2020-06-24" @default.
- W4239331376 modified "2023-10-06" @default.
- W4239331376 title "Monochromatic Green Light Stimulation During Incubation Shortened the Hatching Time via Pineal Function in White Leghorn Eggs" @default.
- W4239331376 doi "https://doi.org/10.21203/rs.3.rs-37386/v1" @default.
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