Studies of thyroid function in fattening beef cattle with special reference to hypothyrosis ii. thyroxine and triiodothyronine content in the blood serum of normal beef cattle and those with the clinical picture of hypothyrosis

Zdelar, F.; Mitin, V.; Hahn, V.; Kraljevic, P.; Alegro, A.

Veterinarski Arhiv 56(2): 47-66

1986


ISSN/ISBN: 0372-5480
Accession: 006503315

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Abstract
The investigations were carried out in 12 heads of beef cattle of domesticated Simmental breed in the course of both fattening periods, i.e, at the age of animals from 2 to 11 months. In 6 animals aged 3 to 5.5 months, total bilateral thyroidectomy was performed, while the remaining animals served as controls. All thyroidectomized animals developed the accessory thyroid tissue and showed clinically manifest symptoms of hypothyroidosis. Thyroidohormonal activity was determined on the basis of thyroxine and triiodothyronine content in the blood serum, the content itself being measured by the radioimmunological method using ready-made reagents of the firm Amersham (England). The results obtained have shown that the average thyroxine content in the serum of beef cattle with the histologically unchanged thyroid during the initial fattening period amounted to 5.58 .mu.g/100 ml and as significantly (P < 0.001) higher than that in the course of the prolonged fattening period (3.33 .mu.g/100 ml). The level of the same hormone in the serum of beef cattle with the clinical picture of hypothyrosis was 2.86 .mu.g/100 ml during the first and 2.08 .mu.g/100 ml during the second fattening period, the difference not being significant.