Green light and intermittent lighting modulate testicular gonadotropin inhibitory hormone without central or morphological effects in broiler chickens

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dc.authorid0000-0002-4077-6634
dc.authorid0000-0003-0891-5523
dc.authorid0000-0002-3208-6772
dc.contributor.authorAykoç Göçer, Miray
dc.contributor.authorAkın, S. G.
dc.contributor.authorÖzel Armutoğlu, Emine
dc.contributor.authorKoç Yıldırım, Ece
dc.date.accessioned2026-02-02T16:11:45Z
dc.date.available2026-02-02T16:11:45Z
dc.date.issued2025
dc.departmentFakülteler, Tıp Fakültesi, Temel Tıp Bilimleri Bölümü, Histoloji ve Embriyoloji Ana Bilim Dalı
dc.description.abstractEnvironmental factors, especially light duration and wavelength (colour), affect reproductive physiology in broilers. In birds, light is perceived especially by extraretinal photoreceptors in the brain, including the hy pothalamus, which regulates reproductive function. Gonadotropin-inhibitory hormone (GnIH), expressed in both the hypothalamus and gonads, suppresses gonadotropin release and modulates reproductive activity. Its expression is influenced by photoperiod and light colour. Rooster fertility is economically important, as one male can inseminate many females. This study investigated how green light and intermittent lighting affect GnIH levels and testicular development in prepubertal broiler males. 288 one-day-old male commer cial broilers (Ross-308) were divided into four groups (n=12) and exposed to: Group I, 18 hours light - 6 hours dark (18L:6D) with white light; Group II, 18L:6D with green light; Group III, 17L:3D:1L:3D with white light; and Group IV, 17L:3D:1L:3D with green light. The study was conducted in four identical ex perimental rooms, each consisting of six pens (replicates). Two male broilers were randomly selected from each pen. A total of 48 chickens, 2 males from each pen (replicate group), were randomly selected for analysis. After 42 days under standard conditions, GnIH levels were measured in the hypothalamus and testes via ELISA. Testicular development was assessed histologically by evaluating seminiferous tubule diameter and epithelial height. Results showed that intermittent lighting and green light significantly in creased testicular GnIH levels but had no effect on hypothalamic GnIH. The most pronounced increase in testicular GnIH was observed in Group IV, which received both intermittent lighting and green light. No significant differences were observed in testicular morphology. These findings suggest that intermittent lighting and green light may selectively influence gonadal GnIH levels without affecting central GnIH or morphology, offering insight into how lighting strategies may be optimized in poultry production.
dc.identifier.citationAykoç Göçer, M., Akın, S. G., Özel Armutoğlu, E., & Koç Yıldırım, E. (2025). Green light and intermittent lighting modulate testicular gonadotropin inhibitory hormone without central or morphological effects in broiler chickens. Iranian Journal of Applied Animal Science, 15(4), 617-625. https://doi.org/10.71798/ijas.2025.1229007
dc.identifier.doi10.71798/ijas.2025.1229007
dc.identifier.endpage625
dc.identifier.issn2251-628X
dc.identifier.issn2251-631X
dc.identifier.issue4
dc.identifier.scopusqualityQ3
dc.identifier.startpage617
dc.identifier.urihttps://doi.org/10.71798/ijas.2025.1229007
dc.identifier.urihttps://hdl.handle.net/20.500.13055/1286
dc.identifier.volume15
dc.identifier.wosWOS:001653967300002
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynak.otherESCI - Emerging Sources Citation Index
dc.institutionauthorEmine, Özel Armutoğlu
dc.institutionauthorid0000-0003-0891-5523
dc.language.isoen
dc.publisherIslamic Azad University
dc.relation.ispartofIranian Journal of Applied Animal Science
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectEndocrinology
dc.subjectHistology
dc.subjectHormones
dc.subjectLighting
dc.subjectPhysiology
dc.subjectReproduction
dc.titleGreen light and intermittent lighting modulate testicular gonadotropin inhibitory hormone without central or morphological effects in broiler chickens
dc.typeArticle
dspace.entity.typePublication

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