Circadian Variations of Thyroid Hormone Levels of Nonpregnant Uniparous Fat-tailed Iranian Ewes in Summer

Saeed NAZIFI; Mahdi SAEB; Mahdi HASANKHANI; Maryam ANSARI-LARI

Article Details

Circadian Variations of Thyroid Hormone Levels of Nonpregnant Uniparous Fat-tailed Iranian Ewes in Summer

Authors:

Saeed NAZIFI | Mahdi SAEB | Mahdi HASANKHANI | Maryam ANSARI-LARI

Publisher:

TUBITAK

Journal:

Turkish Journal of Veterinary and Animal Sciences 2008 Vol.32 Issue 2, pp.137-140

Document Type:

Article

Publication Date:

1/2008

Document Language:

Turkish

Document ID (Org No.):

2000768035

Frequency:

Bimonthly

eISSN:

1303-6181

pISSN:

1300-0128

Keywords:

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.

 

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.

Article Details

Circadian Variations of Thyroid Hormone Levels of Nonpregnant Uniparous Fat-tailed Iranian Ewes in Summer

Authors:

Saeed NAZIFI | Mahdi SAEB | Mahdi HASANKHANI | Maryam ANSARI-LARI

Publisher:

TUBITAK

Journal:

Turkish Journal of Veterinary and Animal Sciences 2008 Vol.32 Issue 2, pp.137-140

Document Type:

Article

Publication Date:

1/2008

Document Language:

Turkish

Document ID (Org No.):

2000768035

Frequency:

Bimonthly

eISSN:

1303-6181

pISSN:

1300-0128

Circadian rhythm

triiodothyronine

thyroxine

nonpregnant uniparous ewes

Issues

Article Details

Circadian Variations of Thyroid Hormone Levels of Nonpregnant Uniparous Fat-tailed Iranian Ewes in Summer

Authors: Saeed NAZIFI | Mahdi SAEB | Mahdi HASANKHANI | Maryam ANSARI-LARI

Publisher: TUBITAK

Journal: Turkish Journal of Veterinary and Animal Sciences 2008 Vol.32 Issue 2, pp.137-140

Document Type: Article

Publication Date: 1/2008

Document Language: Turkish

Document ID (Org No.): 2000768035

Frequency: Bimonthly

eISSN: 1303-6181

pISSN: 1300-0128

Circadian rhythm

triiodothyronine

thyroxine

nonpregnant uniparous ewes

Issues

Authors:

Saeed NAZIFI | Mahdi SAEB | Mahdi HASANKHANI | Maryam ANSARI-LARI

Publisher:

TUBITAK

Journal:

Turkish Journal of Veterinary and Animal Sciences 2008 Vol.32 Issue 2, pp.137-140

Document Type:

Article

Publication Date:

1/2008

Document Language:

Turkish

Document ID (Org No.):

2000768035

Frequency:

Bimonthly

eISSN:

1303-6181

pISSN:

1300-0128