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Activity of the thyroid gland of cattle
KŘÍŽOVÁ, Zuzana
The thesis deals with the evaluation of the impact of different quantities and forms of iodine in ration dairy cows on the concentration of hormones of the thyroid in the blood plasma. The experiment was done with a herd of Red cows breeding in the conversion to breed in the breeding of Holstein dairy cows in Klatovy. Iodine was given in both inorganic and organic form. Before experimenting, the value of total and free forms of hormones was very low. During the experiment, increased concentrations of hormones in connection with the intake of inorganic iodine, the significant deviations showed free forms of thyroid hoemones. Nevertheless, the addition of organic iodine was not fully substituted for the reduction of inorganic iodine content. The thesis also discusses the assessment of the thyroid status by Czech red cattlebreeding on the school farm. The aim was to compare the activity of the thyroid gland in high-yield dairy cows breeding in a barn environment and cattle on pasture reared cattle. For red cattle reared on pasture, there were characteristically higher concentration levels of total and free hormones compared with high yield dairy cows. Nevertheless, in comparison with the reference value,there was a concentration of TT4 for Czech red cattlelower, it coresponded well as dairy cows, rather lower iodine supply. In connection with the rise (higher content) TT4, possibly fT4, there was a similar tendency for the TT3 and fT3, so we can´t assume a deeper state of iodine deficiencies and its associationwith an underactive thyroid gland.
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Thyroid hormones in blood plasma of dairy cows
KŘÍŽOVÁ, Zuzana
Thesis deals with the evaluation of the impact of different quantities and forms of iodine in ration dairy cows on the concentration of hormones of the thyroid in the blood plasma. Iodine was given in the inorganic (Vitamix S7+) and organic form (UNI-SATURAN J). The experiment was done with a herd of Red cows fleckvieh breeding in the conversion to breed in the breeding of Holstein dairy cows in distrikt Klatovy. The average concentration of thyroxine (TT4) before experiment was 50.91+-12.96 nmol/1, 1.6+-0.53 nmol/l of trijodthyronine (TT3). Free forms of hormones showed: FT4 1.09+-0.06 pmol/l and FT3 2.5+-0.08 pmol/l. Free forms of hormones showed more considerable divergencies.
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