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Pakistan Journal of Biological Sciences
  Year: 2006 | Volume: 9 | Issue: 12 | Page No.: 2308-2312
DOI: 10.3923/pjbs.2006.2308.2312
 
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The Effect of Ambient Temperature on Thyroid Hormones Concentration and Histopathological Changes of Thyroid Gland in Sheep

M. Nouri, K.H. Mirzadeh and B. Mohamadian

Abstract:
To identify the thyroid histological and hormonal changes in response to ambient temperature variations, thyroid glands and blood samples were randomly collected from 410 indigenous sheep of either sex and different age groups from municipal Ahvaz slaughter house. The extent of fluctuations in triiodothyronine (T3), thyroxin (T4), T3 uptake and Free Thyroxin Index (FTI) and thyroid histopathological lesions were scrutinized in 2 months in year 2003, viz February (the coldest month) and August (the hottest month). A marked decline was discernable in T3, T4 and FTI in August compared to February, but mean value for T3 uptake increased. Out of 410 pairs of thyroid glands, 169 (41.2%) had lesions in which histopathological changes were categorized as follicular atrophy (43.6%), ultimobranchial cyst (30.2%), paranchymal cyst (6.4%), lymphocytic thyroiditis (6.2%), hyperemia/hemorrhage (5.5%), follicular cell hyperplasia (4%), C cell hyperplasia (1.4%), colloid goiter (1.1%) and adenoma (1.1). Mean of thyroidal parameters for T4 and FTI was higher in lesioned group (p<0.05). The frequency of lesioned thyroid was higher in summer than winter (p<0.05). The result of this study showed that high ambient temperature has profound effect on thyroid function, secretion and pathological changes in sheep.
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How to cite this article:

M. Nouri, K.H. Mirzadeh and B. Mohamadian , 2006. The Effect of Ambient Temperature on Thyroid Hormones Concentration and Histopathological Changes of Thyroid Gland in Sheep. Pakistan Journal of Biological Sciences, 9: 2308-2312.

DOI: 10.3923/pjbs.2006.2308.2312

URL: https://scialert.net/abstract/?doi=pjbs.2006.2308.2312

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