The paper presents the statistical calculations of correlation coefficients (r) between the concentrations of various hormones in peripheral and ovarian venous plasma of hypo- and hyperthyroid, experimental cyst-bearing gilts. The experiment was carried out on 70 gilts randomly divided into the following six groups (10-16 heads in each): control, hypo- and hyperthyroid gilts (oral application of methylthiouracyl and injections of L-thyroxine) and gonadotropine (PMSG and hCG) treated eu- hypo- and hyperthyroid animals. The experiment started on the 2nd day of estrous cycle. Gonadotropins were applied starting from the 15th day of the cycle for 10 consequtive days. Peripheral venous blood samples were collected several times during the experiment by cannulation of the v. jugularis. On the 25th day of the experiment ovarian blood was collected after laparotomy by cannulation of uterovarian veins and again 2-3 days later (cannulae exposed on back of animals). The gilts were slaughtered on the 2nd - 3rd day after laparotomy. Ovaries were excised, inspected and the number of cysts, follicles and corpora lutea was counted. In several samples of peripheral and ovarian plasma of each gilt, the concentrations of luteinizing hormone (LH), prolactin (PRL), estrone (E,), estradiol- 17p (E2), progesterone (P4), androstenedione (A4), testosterone (T) and Cortisol (CI) were analysed by RIA procedures. The correlation coefficients (r) were calculated between concentrations of various hormones in both kinds of plasma in suitable pairs of individual animals of all groups as well as between their relations to the number of ovarian structures. Hypothyroid gilts evidenced correlation of the level of T to E1 and E2 but hyperthyroid animals - correlation of the level of A4 to P4, LH, PRL, Cl and PRL to P4 and LH. The euthyroid gilts after gonadotropine treatment showed interrelation of the concentration of PRL to LH and E, to E2, T and PRL. Hypothyroid and gonadotropine treated gilts evidenced numerous correlations, namely: the level of E1 to E2 and T and A4 to CI, E2, P4, P4 to PRL and T to LH. Hyperthyroid gilts treated with gonadotropins exhibited correlation of E, to T and A4 to CI. The number of cysts correlated mostly with the concentration of E1, E2, P4 and CI. The follicles showed only singular interrelations with the level of E1, P4, T, LH, PRL and Cl. The number of corpora lutea correlated only with the level of E1 and LH.
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