THE INFLUENCE OF THYROID HORMONES ON THE BLOOD LIPID PROFILE IN HEIFERS DEPENDING ON AGE
N. Fedak1, L. Piddubna2, O. Lesnovska3, L. Mykolaichuk3, D. Mylostyva4, A. Babchenko4, R. Mylostyvyi3
- 1 Institute of Agriculture of the Carpathian region of the National Academy of Agrarian Sciences, Obroshyne village, Lviv region
- 2 Polissia National University, Zhytomyr
- 3 Dnipro State Agrarian and Economic University, Dnipro
- 4 Dnepropetrovsk Scientific Research Institute of Forensic Expertise of the Ministry of Justice of Ukraine, Dnipro
DOI: https://doi.org/10.15407/fz72.03.026

Abstract
The secretory activity of the thyroid gland (TG) and the effects
of thyroid hormones in the bodies of heifers of the V olyn beef
breed were assessed according to age. Age-related changes
in lipid metabolism and free fatty acids (FFA) synthesis were
observed under the influence of thyroid hormones. It was
established that the effects of the hormones are mediated
primarily by triiodothyronine (T3), the concentration of which
is associated with key parameters of lipid metabolism. In the
animals, the maximum thyroxine (T4) content was observed
at 8 months of age and subsequently decreased gradually by
21.8% and 45.2% at 15 and 18 months of age, respectively.
The lowest T3 levels were observed at 15 months, and the
highest at 18 months. Age also influenced lipid metabolism
parameters. Total lipid (TL) levels at 15 and 18 months
were 16.61% and 66.35% lower, respectively, compared to
8-month-old animals. Compared to 8-month-old animals, total
cholesterol (TC) levels in 15- and 18-month-old animals were
also lower by 14.9% and 21.1%, respectively. The influence
of thyroid hormones on FFA synthesis, depending on age, was
also observed. The most pronounced correlations at 8 months
of age were observed between T3 levels and palmitic acid
and oleic acid, as well as T4 and capric acid; in 15-month-old
animals-between T3 and oleic acid and T4 and arachidonic
acid; in 18-month-old animals-between T3 and palmitic acid
and T4 and stearic acid. The results obtained allow the use of
indicators of hormonal-metabolic relationships to assess the
physiological state of animals of different ages.
Keywords:
metabolism; lipid metabolism; thyroid hormones; age-related differences; fatty acids
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