LEVEL OF THYROID HORMONES IN THE BLOOD OF LAMBS AFTER USING
IN THEIR DIET AMINO FCIDS LYSINE, METHIONINE AND SULFUR
O. S. Druzhyna
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Institute of Animal Biology NAAS, Stus str., 38, Lviv, 79034, Ukraine
The effect of essential amino acids lysine, methionine and sulfur as the main supplements to the diet of 4-month lambs of Meryno landshaft breed on the content of thyroid hormones (triiodothyronine and thyroxine ) in their blood have been studied. It has been shown that the thyroxine (T4) level in lambs blood, which received a diet consisting of basic amino acids lysine (3 g) and 2 g of sodium sulfate per head /per day was almost like as in control animals (69.6 vs. 40.0 nmol/L), and the level of triiodothyronine (T3) decreased by 32.6 % (1.76 vs 2.13 nmol/L; P <0.1)compared to control group. At the same time, the inclusion to the diet of lambs elevated levels of sulfur — sulfur-containing amino acids methionine and sodium sulfate (2 g per head /per day, the second experimental group) contributed the increasing T3 on 18.7 % (P<0.05) and T4 on 36.1 % (P<0.01) in blood plasma. The inclusion to lambs diet the amino acid lysine (3 g per head/per day), methionine and sodium sulfate (2 g per head/per day, the third experimental group) resulted in increased plasma levels of both hormones compared with animals in the control group. In particular, T4 content significantly (P<0.01) increased by 20.4 % compared with the control group of animals and decreased by 13.0 % (P<0.05) compared with animals of the second experimental group. The content of T3 was the same with animals in the control group and significantly decreased (P<0.05) on 18.7 % compared to the first experimental group of animals.
It was concluded that lysine as an essential amino acid leads to a decrease in the level of thyroid hormones (especially T3) in the blood of lambs and sulfur-containing substances (methionine, Na2SO4), on the contrary — to increase the thyroid hormones content.
Keywords: LAMBS, BLOOD, THYROID HORMONES, LYSINE, METHIONINE, SULFYR, DIET
