The influence of chronic sound stress on thyroid hormone concentrations in broiler chickens

Abstract

The aim of this experiment was to investigate influence of the chronic sound stress on thyroid hormone concentrations in broiler 'HYBRO' chickens during fastening period of 45 days. Chickens were subjected to the sound stress during two hours every day. Within that period, intervals between two sound signals (school alarm bell, 95 dB) varied from 5 to 115 seconds and lasted 5 seconds each. Chickens were sacrificed on days 15, 30 and 45 when blood samples were taken. Concentrations of T3, and T4 were determined in the blood plasma by RIA method (INEP, Zemun). Chronic sound stress resulted in significant T3 concentration decline on days 15 and 45. In addition, concentration of T4 was considerably decreased on the day 45. Our results indicates that chronic sound stress leads to considerable changes in the thyroid hormone concentrations. .

Cilj ovog rada je bio da se ispita uticaj hroničnog delovanja buke na koncentraciju tireoidnih hormona u krvnoj plazmi brojlera hibrida 'HYBRO' tokom tova od 45 dana. Pilići su svakodnevno bili izlagani delovanju buke u trajanju od 2 sata. U tom periodu intervali između dva uzastopna uključivanja zvučnog signala jačine 95 dB (školsko zvono) varirali su od 5 do 115 sekundi, a dužina trajanja signala iznosila je 5 sekundi. Pilići su žrtvovani 15-og, 30-og i 45-og dana kada su i uzimani uzorci krvi. Koncentracija T3 i T4 je određivana u krvnoj plazmi RIA metodom. Hronično delovanje buke dovelo je do statistički značajnog pada koncentracije T3 15. i 45. dana ogleda. Statistički značajne, razlike kao posledica delovanja zvučnog stresa, u pogledu koncentracije T4 uočene su u uzrastu od 45 dana. Rezultati ovog ispitivanja ukazuju da hronični zvučni stres izaziva značajne promene u koncentraciji tireoidnih hormona.