Beak temperature change in response to acute stress in laying hens measured using infrared thermography/Infracrvena termografija za mjerenje promjena temperature kljuna kao odgovor na akutni stres u kokosi nesilica

• Published in: Veterinarski arhiv Vol. 91; no. 6; p. 647
• Main Authors: Soroko, Maria, Zaborski, Daniel
• Format: Journal Article
• Language: English
• Published: Sveuciliste U Zagrebu 01-11-2021
• Subjects: Computer software industry; United States
• ISSN: 0372-5480
• DOI: 10.24099/vet.arhiv.1127

The aim of this study was to investigate beak surface temperature changes to stress induced by fear resulting from tonic immobility using infrared thermography in laying hens. It was also examined whether beak temperatures differed among brown and white lines. The study was based on 89 hens from both lines: 45 White Leghorn birds and 44 Hy-Line brown birds. Beak temperature was measured with infrared thermography immediately before and after tonic immobility testing. The average temperature was obtained from the upper and lower beak area measurements. The beak temperature before tonic immobility had significantly higher temperature than after tonic immobility testing. Birds with shorter tonic immobility had lower temperature of beak than birds with longer tonic immobility. An interaction effect of stimulus (before and after tonic immobility) and tonic immobility time was significant. The upper and lower beak temperatures significantly (P<0.001) decreased in response to tonic immobility test in birds with shorter tonic immobility. Brown hens had higher lower-beak temperature compared to white hens. Based on these results, hens experienced tonic immobility resulting in beak surface temperature changes that were detectable using thermography. Therefore, infrared thermography could be used as a non-invasive technique to assess beak temperature changes in response to stress. Infrared thermography could improve ability to evaluate hens under potentially stressful conditions. Key words: infrared thermography; beak temperature; tonic immobility; stress response; laying hen Cilj ovog rada bio je istraziti promjene temperature povrsine kljuna u kokosi nesilica uzrokovane stresom zbog straha pri testu tonicne imobilnosti. Mjerenja su obavljena infracrvenom termografi-jom. Istrazeno je i razlikuje li se temperatura kljuna u smede i bijele linije. Ukljuceno je 89 kokosi obiju linija: 45 jedinki pasmine White Leghorn i 44 smede jedinke pasmine Hy-Line. Temperatura kljuna mjerena je infracrvenom termografijom neposredno prije te poslije testa tonicne imobilnosti. Prosjecna temperatura dobivena je mjerenjem gornjeg i donjeg dijela kljuna. Temperatura kljuna prije testa tonicne imobilnosti bila je znakovito visa nego poslije testa tonicne imobilnosti. Jedinke s kracom tonicnom imobilnoscu imale su nizu temperaturu kljuna od ptica u kojih je tonicna imo-bilnost dulje trajala. Interakcija podrazajnog ucinka (prije i poslije tonicne imobilnosti) i vrijeme tonicne imobilnosti bili su znakoviti. Temperatura gornjeg i donjeg dijela kljuna znakovito je snizena (P < 0,001) kao odgovor na test tonicne imobilnosti u jedinki u kojih je test krace trajao. Smede jedinke imale su visu temperaturu donjeg dijela kljuna u usporedbi s jedinkama bijele linije. Na temelju ovih rezultata, u kokosi u kojih je ucinjen test tonicne imobilnosti doslo je do promjene temperature povrsine kljuna koja je izmjerena termografijom. Infracrvena termografija mogla bi se stoga upotrijebiti kao neinvazivna metoda procjene temperaturnih promjena koje prate odgovor na stres. Navedeno bi moglo unaprijediti mogucnost procjene kokosi koje su izlozene potencijalno stresnim uvjetima. Kljucne rijeci: infracrvena termograf __ ja; temperatura kljuna; tonicna imobilnost; odgovor na stres; kokosi nesilice