Features of the relationship between the hormones of the thyrotropin-thyroid system in the body young pigs of different sexes and breeds

The assessment of the state of the thyrotropin-thyroid system in the body of young pigs in the context of sexual dimorphism and different breeds in specific economic conditions is given. It was found that the concentration of TTG, T3 and T4 in the blood of pigs varies in the range of 0.83±0.18-1.07±0.10 mMU/l, 5.76±0.33-7.14±0.41 and 26.82±2.90-28.73±0.93 pmol/l, boars 0.02±0.01-0.03±0.01 mMU/l, 7.50±0.25-9.24±0.34 and 25.74±4.63-31.67±2.43 pmol/l. The concentration of TTG and thyroxine is statistically significantly correlated in pigs at the level of r(TTG-T4)= 0,56±0,16 - 0,89±0,05, hryachkov r(TTG-T4)= 0,76±0,23 - 0,83±0,25). In a pair of TTG - T3 signs, the correlation coefficients are equal in pigs r(TTG-T3)= 0,47±0,09 - 0,51±0,17, hryachkov r(TTG-T3)= 0,49±0,39 - 0,64±0,54. Regulation in the TTG-T4 hormone pair, regardless of gender and breed of animals, is carried out on the principle of positive feedback (the higher the level of TTG in the blood, the greater the concentration of thyroxine). Functional communication in the TTG-T3 pair in the body of pigs and boars within the physiological scale of TSH concentrations is supported by the principle of direct and feedback, as well as the principle of "active regulation of vegetative functions".