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The goal of the study was to map the blood serum concentrations of thyroid  hormones in various age categories in cattle, small ruminants, and swine.  Blood serum concentrations of TSH, T4, and T3 were analysed in randomly  selected healthy animals of various species and age. Age-dependent changes of  thyroid hormones were studied in 7 clinically healthy calves during the first  6 months of life. The observation started at the age of one month (body  weight 45 - 51 kg). A similar study was done in 9 sucking piglets since birth  to 9 weeks of age (weaning at 35 days). Blood samples were taken every week.  In calves, heifers, and dairy cows we recorded significant differences in T4  and T3 values with the highest levels in heifers (p<0.05). The hormones mean  concentrations in sheep, goats, and swine corresponded to data reported by  other researchers. Within age dependent studies, mean concentrations of TSH  showed no significant changes, however, most of the samples showed  concentrations below the detection limit of the assay. In the third month  close to weaning we found significantly lower serum T4 concentrations  (p<0.05), compared with the initial value. Similar, but however insignificant  decrease was observed for T3 concentrations. In the piglets, both T4 and T3  concentrations showed a significant (p<0.001) decrease during the study with  the highest mean concentrations of T3 and T4 in the youngest piglets. After  weaning, both in calves and piglets concentrations of the hormones slightly  increased

Concentrations of thyroid hormones in various age categories of ruminants and swine