Endocrine and molecular regulation mechanisms of follicular development and egg-laying in quails under different photoperiods

Photoperiod is a key environmental factor in regulating bird reproduction and induces neuroendocrine changes through the hypothalamic-pituitary-gonadal (HPG) axis. OPN5, as a deep-brain photoreceptor, transmits light signals to regulate follicular development through TSH-DIO2/DIO3. However, the mech...

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Published in:Animal biotechnology 2023-12, Vol.34 (9), p.4809-4818
Main Authors: Zhou, Xiaoli, Jiang, Danli, Xu, Yanglong, Pan, Jianqiu, Xu, Danning, Tian, Yunbo, Shen, Xu, Huang, Yunmao
Format: Article
Language:English
Subjects:
Birds
Down-regulation
Egg laying
Eggs
Environmental factors
follicle development
Follicles
Gene expression
Gonadotropin-releasing hormone
Hypothalamic-pituitary-gonadal axis
Hypothalamus
Luteinizing hormone
neuro-endocrine regulations
Photoperiodicity
Pituitary
Pituitary (anterior)
Potentiation
Quail
short-photoperiod
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container_end_page 4818
container_issue 9
container_start_page 4809
container_title Animal biotechnology
container_volume 34
creator Zhou, Xiaoli
Jiang, Danli
Xu, Yanglong
Pan, Jianqiu
Xu, Danning
Tian, Yunbo
Shen, Xu
Huang, Yunmao
description Photoperiod is a key environmental factor in regulating bird reproduction and induces neuroendocrine changes through the hypothalamic-pituitary-gonadal (HPG) axis. OPN5, as a deep-brain photoreceptor, transmits light signals to regulate follicular development through TSH-DIO2/DIO3. However, the mechanism among OPN5, TSH-DIO2/DIO3, and VIP/PRL in the HPG axis underlying the photoperiodic regulation of bird reproduction is unclear. In this study, 72 laying quails with 8-week-old were randomly divided into the long-day (LD) group [16 light (L): 8 dark (D)] and the short-day (SD) group (8 L:16 D), and then samples were collected on d 1, d 11, d 22, and d 36 of the experiment. The results showed that compared with the LD group, the SD group significantly inhibited follicular development (P 
doi_str_mv 10.1080/10495398.2023.2196551
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OPN5, as a deep-brain photoreceptor, transmits light signals to regulate follicular development through TSH-DIO2/DIO3. However, the mechanism among OPN5, TSH-DIO2/DIO3, and VIP/PRL in the HPG axis underlying the photoperiodic regulation of bird reproduction is unclear. In this study, 72 laying quails with 8-week-old were randomly divided into the long-day (LD) group [16 light (L): 8 dark (D)] and the short-day (SD) group (8 L:16 D), and then samples were collected on d 1, d 11, d 22, and d 36 of the experiment. The results showed that compared with the LD group, the SD group significantly inhibited follicular development (P &lt; 0.05), decreased the P4, E2, LH, and PRL in serum (P &lt; 0.05), downregulated the expression of GnRHR, VIP, PRL, OPN5, DIO2, and LHβ (P &lt; 0.05), reduced the expression of GnRH and TSHβ (P &gt; 0.05), and promoted DIO3, GnIH gene expression (P &lt; 0.01). The short photoperiod downregulates OPN5, TSHβ, and DIO2 and upregulates DIO3 expression to regulate the GnRH/GnIH system. The downregulation of GnRHR and upregulation of GnIH resulted in a decrease in LH secretion, which withdrew the gonadotropic effects on ovarian follicles development. 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Slow down of follicular development and egg laying may also arise from lack of PRL potentiation to small follicle development under short days.</description><subject>Birds</subject><subject>Down-regulation</subject><subject>Egg laying</subject><subject>Eggs</subject><subject>Environmental factors</subject><subject>follicle development</subject><subject>Follicles</subject><subject>Gene expression</subject><subject>Gonadotropin-releasing hormone</subject><subject>Hypothalamic-pituitary-gonadal axis</subject><subject>Hypothalamus</subject><subject>Luteinizing hormone</subject><subject>neuro-endocrine regulations</subject><subject>Photoperiodicity</subject><subject>Pituitary</subject><subject>Pituitary (anterior)</subject><subject>Potentiation</subject><subject>Quail</subject><subject>short-photoperiod</subject><issn>1049-5398</issn><issn>1532-2378</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><recordid>eNp90U1vFSEUBmBiNLZWf4KGxI2bufIxOLDTNLWaNHGja8LA4ZaGgSnMaO7C_y7Te-vChatzFs97IHkRek3JjhJJ3lPSK8GV3DHC-I5R9UEI-gSdU8FZx_ggn7a9mW5DZ-hFrXeEUCY5eY7O-EAYI5Seo99XyWVbQgJsksNTjmDXaAousG9zCTnhCeytSaFOFWePfY4xHI2DnxDzPEFaHtKw33fRHELa45Dw_WpCrHhNDhoN3kPZ4HyblzxDCdnVl-iZN7HCq9O8QD8-X32__NLdfLv-evnpprO8Z0snGDXSMsIV8456r6xVintu2CikYqAGIaEfoRFLnR0pBysJHwdilXPQ8wv07nh3Lvl-hbroKVQLMZoEea2aDWqgfa962ejbf-hdXktqv9NMMcGHnpNNiaOyJddawOu5hMmUg6ZEb_3ox3701o8-9dNyb07X13EC9zf1WEgDH48gJJ_LZH7lEp1ezCHm4otJNlTN___GH4zloYs</recordid><startdate>202312</startdate><enddate>202312</enddate><creator>Zhou, Xiaoli</creator><creator>Jiang, Danli</creator><creator>Xu, Yanglong</creator><creator>Pan, Jianqiu</creator><creator>Xu, Danning</creator><creator>Tian, Yunbo</creator><creator>Shen, Xu</creator><creator>Huang, Yunmao</creator><general>Taylor &amp; 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OPN5, as a deep-brain photoreceptor, transmits light signals to regulate follicular development through TSH-DIO2/DIO3. However, the mechanism among OPN5, TSH-DIO2/DIO3, and VIP/PRL in the HPG axis underlying the photoperiodic regulation of bird reproduction is unclear. In this study, 72 laying quails with 8-week-old were randomly divided into the long-day (LD) group [16 light (L): 8 dark (D)] and the short-day (SD) group (8 L:16 D), and then samples were collected on d 1, d 11, d 22, and d 36 of the experiment. The results showed that compared with the LD group, the SD group significantly inhibited follicular development (P &lt; 0.05), decreased the P4, E2, LH, and PRL in serum (P &lt; 0.05), downregulated the expression of GnRHR, VIP, PRL, OPN5, DIO2, and LHβ (P &lt; 0.05), reduced the expression of GnRH and TSHβ (P &gt; 0.05), and promoted DIO3, GnIH gene expression (P &lt; 0.01). 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1532-2378
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subjects Birds
Down-regulation
Egg laying
Eggs
Environmental factors
follicle development
Follicles
Gene expression
Gonadotropin-releasing hormone
Hypothalamic-pituitary-gonadal axis
Hypothalamus
Luteinizing hormone
neuro-endocrine regulations
Photoperiodicity
Pituitary
Pituitary (anterior)
Potentiation
Quail
short-photoperiod
title Endocrine and molecular regulation mechanisms of follicular development and egg-laying in quails under different photoperiods
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