SavedAdd your journal

Journals / Turkish Journal of Veterinary and Animal Sciences / 2008 / Cilt: 32 - Sayı: 2

Circadian variations in thyroid hormone levels of nonpregnant uniparous fat-tailed Iranian ewes in summer

Mahdi SAEB
Saeed NAZİFİ
Mahdi HASANKHANİ
Maryam ANSARI-LARI
Pages
137–140
Publication Date
2022-11-05
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

It is concluded that circadian rhythm was observed in serum thyroid hormones.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Circadian variations in serum triiodothyronine (T3), thyroxine (T4), free triiodothyronine (fT3), and free thyroxine (fT4) levels were investigated in Iranian ewes.
📊
Key Findings & Data:For that purpose, blood samples were collected from the jugular veins of 15 adult clinically healthy Iranian nonpregnant uniparous ewes every 6 h (0600, 1200, 1800, and 0000) during 6 days in summer with a mean ambient temperature of 40 °C.
💡
Conclusion & Impact:It is concluded that circadian rhythm was observed in serum thyroid hormones.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Circadian variations in serum triiodothyronine (T3), thyroxine (T4), free triiodothyronine (fT3), and free thyroxine (fT4) levels were investigated in Iranian ewes. For that purpose, blood samples were collected from the jugular veins of 15 adult clinically healthy Iranian nonpregnant uniparous ewes every 6 h (0600, 1200, 1800, and 0000) during 6 days in summer with a mean ambient temperature of 40 °C. Serum T3, T4, fT3, and fT4 were measured by radioimmunoassay. There were statistically significant differences in thyroid hormone concentrations (T3, T4, fT3, and fT4) at different hours of the day. The results revealed that serum T3, T4, fT3, and fT4 levels were highest at 1800 (P < 0.05). Significant 24 h periodicity in the serum levels of T3, T4, fT4 and fT3 was observed in nonpregnant uniparous Iranian ewes. It is concluded that circadian rhythm was observed in serum thyroid hormones.

🔖

Cite This Article

SAEB, M., NAZİFİ, S., HASANKHANİ, M., ANSARI-LARI, M. (2022). Circadian variations in thyroid hormone levels of nonpregnant uniparous fat-tailed Iranian ewes in summer. Turkish Journal of Veterinary and Animal Sciences, Cilt: 32 - Sayı: 2, 137–140. https://ajindex.com/articles/615384

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (13)

  1. Kaneko, J.J.: Clinical Biochemistry of Domestic Animals. 4th edn., Academic Press., New York. 1989; 630-648
  2. Assane, M., Sere, A.: Influence of the season and of gestation on the plasma concentration of thyroid hormones: triiodothyronine (T3) and thyroxine (T4) in Sahel Peulh ewes. Ann. Rech. Vet., 1990; 21: 285-289. (article in French with an abstract in English
  3. Salem, M.H., EI-Sherbiny, A.A., Khalil, M.H., Yousef, M.K.: Diurnal and seasonal rhythm in plasma cortisol, triiodothyronine and thyroxine as affected by the wool coat in Barki sheep. Indian J. Anim. Sci., 1991; 61: 946-951
  4. Ashutosh, M., Dhanda, O.P., Kundu, R.L.: Effect of climate on the seasonal endocrine profile of native and crossbred sheep under semi-arid conditions. Trop. Anim. Health Prod., 2001; 33: 241- 252
  5. Krebietke, P.: Diurnal rhythms of thyroid hormones in rooster chicks (Gallus domesticus)
  6. Studies on the colloid epithelium protein, the radioiodine accumulation in the thyroid gland and the plasma radioiodine concentration. Endokrinologie, 1975; 65: 33- 41. (article in German with an abstract in English
  7. Krebietke, P.: Diurnal rhythms of thyroid hormones in rooster chicks (Gallus domesticus)
  8. Studies on the protein-bound radioiodine and the “free” hormone portion. Endokrinologie, 1975; 65: 42-52. (article in German with an abstract in English
  9. Guagnano, M.T., Del Ponte, A., Menduni, P., Nuzzo, A., Palummeri, E., Angelucci, E., Vitacolonna, E., Sensi, S.: Time structure of endocrine secretion. II. Circannual variations in the free fractions of tri- and tetraiodothyronine, cortisol, human growth hormone and plasma insulin in healthy subjects. Boll. Soc. Ital. Biol. Sper., 1983; 59: 1243-1247. (article in Italian with an abstract in English
  10. Wong, C.C., Döhler, K.D., Atkinson, M.J., Geerlings, H., Hesch, R.D., von zur Mühlen, A.: Influence of age, strain and season on diurnal periodicity of thyroid stimulating hormone, thyroxine, triiodothyronine and parathyroid hormone in the serum of male laboratory rats. Acta. Endocrinol. (Copenh)., 1983; 102: 377- 385
  11. Komosa M., Flisi´nska-Bojanowska A., Gill J.: Development of diurnal rhythm in some metabolic parameters in foals. Comp. Biochem. Physiol. A., 1990; 95: 549-552
  12. Flisi´nska-Bojanowska, A., Komosa, M., Gill, J.: Influence of pregnancy on diurnal and seasonal changes in cortisol, T3 and T4 levels in the mare blood serum. Comp. Biochem. Physiol. A., 1991; 98: 23-30
  13. Souza, M.I.L., Bicudo, S.D.,