Etlik Piliçlerde Aralıklı Aydınlatma ve Işık Spektrumunun Tibiotarsal Morfometri ve Biyomekanik Üzerine Etkileri

Year 2025, Volume: 14 Issue: 2, 143 - 149, 24.12.2025

İsmail Gökçe Yıldırım , Firuze Türker Yavaş , Figen Sevil Kilimci

https://doi.org/10.31196/huvfd.1781934

Abstract

Aydınlatma rejimi, etlik piliç yetiştiriciliğinde iskelet gelişimi ve hayvan refahı açısından kritik bir çevresel faktördür. Bu çalışmada fotoperiyot deseninin (kesintisiz vs. aralıklı) ve ışık spektrumunun (beyaz vs. yeşil) tibiotarsus’un morfometrik ve biyomekanik özellikleri üzerindeki birleşik etkileri değerlendirildi. Kırk dört etlik piliç rastgele olarak dört gruba ayrıldı ve 42 günlük yaşa kadar ilgili ışık koşullarına maruz bırakıldı. Morfometrik parametreler—kemik uzunluğu, dış ve iç çaplar ile kortikal indeksler—dijital kumpas kullanılarak ölçüldü. Biyomekanik özellikler, kırılma yükü, rijitlik, atalet momenti ve elastik modülün belirlenmesi amacıyla üç nokta eğme testi ile değerlendirildi. Aralıklı aydınlatma, kesintisiz aydınlatmaya kıyasla kemik uzunluğu ve craniocaudal iç çapta anlamlı artış sağlamıştır (P < 0,05). Bu durumun, artan lokomotor aktiviteye bağlı mekanik yüklenmenin sonucu olduğu düşünülmektedir. Kırılma yükü ve rijitlik gibi mekanik parametreler aralıklı aydınlatmada artış eğilimi göstermiştir (+%3,9 ve +%4,3); ancak bu farklar istatistiksel olarak anlamlı bulunmamıştır. Beyaz ve yeşil ışık arasında ise ne morfometrik ne de biyomekanik açıdan anlamlı bir fark gözlenmemiştir. Sonuç olarak, aralıklı aydınlatmanın, mekanik dayanımda belirgin bir değişiklik olmasa bile, kemik morfometrik özelliklerini iyileştirerek etlik piliçlerde iskelet gelişimine katkı sağlayabileceği belirlenmiştir. Işık spektrumunun etkisinin sınırlı kalması, kontrollü koşullarda bacak sağlığı ve refahını geliştirmede fotoperiyot manipülasyonunun spektral düzenlemeye kıyasla daha etkili bir strateji olabileceğini göstermektedir.

Keywords

biyomekanik , etlik piliç , fotoperiyot , ışık spektrumu , kanatlı refahı , tibiotarsus

Ethical Statement

Bu çalışma, Aydın Adnan Menderes Üniversitesi Hayvan Deneyleri Yerel Etik Kurulu'nun 64583101/2023/45 sayılı izni ile yürütülmüştür. Ayrıca yazarlar Araştırma ve Yayın Etiği kurallarına uyduklarını beyan etmişlerdir.

Supporting Institution

Bu araştırma için herhangi bir dış finansman sağlanmamıştır.

Thanks

Materyallerin sağlanması sırasında desteklerinden dolayı Dr. Öğr. Üyesi Ece KOÇ YILDIRIM ve Doç. Dr. Mehmet KAYA'ya teşekkür ederiz.

Effects of Intermittent Lighting and Light Spectrum on Tibiotarsus Morphometry and Biomechanics in Broilers

Abstract

The lighting regime is a critical environmental variable in broiler production, with significant implications for skeletal development and welfare. This study evaluated the combined effects of photoperiod pattern (continuous vs. intermittent) and light spectrum (white vs. green) on the morphometric and biomechanical characteristics of the tibiotarsus in broiler chickens. Forty-four broilers were randomly assigned to four groups and exposed to the respective light conditions until 42 days of age. Morphometric parameters, including bone length, external and internal diameters, and cortical indices, were measured using digital calipers. Biomechanical properties were assessed via three-point bending tests to determine fracture load, stiffness, moment of inertia, and elastic modulus. Intermittent lighting significantly increased bone length and internal craniocaudal diameter compared to continuous lighting (P < 0.05), likely reflecting increased mechanical loading from enhanced locomotor activity. Although mechanical parameters such as fracture load and stiffness exhibited positive trends under intermittent lighting (+3.9% and +4.3%, respectively), these differences did not reach statistical significance. No significant differences were observed between white and green light in either morphometric or biomechanical outcomes, suggesting limited spectral influence under the conditions tested. In conclusion, the findings indicate that intermittent lighting may improve skeletal development in broilers by enhancing morphometric bone traits, even in the absence of marked changes in mechanical strength. The negligible effect of light spectrum suggests that, under controlled conditions, photoperiod manipulation may be a more effective strategy than spectral adjustment for promoting leg health and welfare in commercial broiler production.

Keywords

biomechanics , broiler , light spectrum , photoperiod , poultry welfare , tibiotarsus

Ethical Statement

This study was carried out with the permission of Aydın Adnan Menderes University, Animal Experiments Local Ethics Committee, number 64583101/2023/45. In addition, the authors declared that Research and Publication Ethical rules were followed.

Supporting Institution

This research received no external funding.

Thanks

We would like to thank Assistant Professor Dr. Ece KOÇ YILDIRIM and Associate Professor Dr. Mehmet KAYA for support during providing materials.

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