Effects of environmental temperature on thyroid hormones in the barn owl (Tyto alba)

Ákos Klein, M. Kulcsár, Virág Krízsik, R. Mátics, P. Rudas, J. Török, G. Huszenicza

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The basic patterns of thyroid hormones [thyroxine (T4) and 3,3′,5-triiodothyronine (T3)] and the T4 and T3 responses induced by thyrotropin releasing hormone (TRH) are reported in captive female barn owls (Tyto alba) during the non-breeding period. The main findings of the study, conducted on a total of 10 owls, are as follow: (1) The thyroid gland of barn owl can be stimulated by the classical TRH stimulation test. (2) T3 response was much more pronounced both under cold (around 10 °C) and warm (around 20 °C) conditions, whereas T4 response ranged so widely that we could not point out any significant change in it. (3) Basal T3 plasma level was significantly (p = 0.036) higher in birds exposed to cold temperature, and they responded to TRH treatment with a lower plasma T3 elevation than the birds kept in a warm chamber. This pattern, however, cannot be explained by increased food intake, but is in agreement with the fact that enhanced T3 level may account for higher avUCP mRNA expression, which results in higher heat production on the cell level. From the results it is concluded that altering T3 plasma level plays a significant role in cold-induced thermoregulation.

Original languageEnglish
Pages (from-to)321-331
Number of pages11
JournalActa Veterinaria Hungarica
Volume54
Issue number3
DOIs
Publication statusPublished - 2006

Fingerprint

Strigiformes
Tyto alba
triiodothyronine
thyroid hormones
Thyroid Hormones
Thyrotropin-Releasing Hormone
ambient temperature
Temperature
thyrotropin-releasing hormone
Thyroxine
Birds
L-thyroxine
Thermogenesis
Body Temperature Regulation
Triiodothyronine
Thyroid Gland
Eating
Messenger RNA
thyroid gland
birds

Keywords

  • Barn owl
  • Temperature
  • Thermoregulation
  • Thyroid hormones
  • Thyrotropin releasing hormone

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Effects of environmental temperature on thyroid hormones in the barn owl (Tyto alba). / Klein, Ákos; Kulcsár, M.; Krízsik, Virág; Mátics, R.; Rudas, P.; Török, J.; Huszenicza, G.

In: Acta Veterinaria Hungarica, Vol. 54, No. 3, 2006, p. 321-331.

Research output: Contribution to journalArticle

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