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Dos t Ii 1 M., Bohumira B ilk 0 v Ii, J. Vas k u, V. P a vii C e k, P. G u b a, 0 1 gaS 0 t 0 1 0 v Ii: The Influence of Sleep Deprivation on Levels of Serum Hormones in Healthv Calves (Technical CoDmunication). Acta vet. Bmo. 57.1988:183-190. The influence of 24 h of sleep deprivation on the blood serum concentration of aldosterone, thyrotropine, triiodthy­ ronine, and thyroxine was studied in healthy calves. In the experiment, 14 calves (Bohemian Pied x Holstein) aged 3 months with mean body mass of 85 kg were used. Blood samples were collected from the v. jugularis externa. The concentration of hormones was measured using RIA. A sleep deprivation of 24 h led to a statistically signi­ ficant (P(O. 05) increase of aldosterone and thyrotropine le­ vels and to a significant (P(0.05) decreae of triiodthyronine. The level of thyroxine and the triiodthyronine/thyroxine ratio were not changed significantly. Calf, stress, aldosterone, TSH, T3 and T4 •

The Influence of Sleep Deprivation on Levels of Serum Hormones in Healthy Calves (Technical Communication)