Author/Editor		Čebulj-Kadunc, N; Kosec, M; Cestnik, V
Title		Ščitnični in steroidni hormoni v serumu lipicanskih konj
Translated title		Serum thyroid and steroid hormone levels in Lipizzian horses
Type		članek
Source		Slov Vet Res
Vol. and No.		Letnik 40, št. 1
Publication year		2003
Volume		str. 9-16
Language		slo, eng
Abstract		The variation of serum thyroid (triiodothyronine - T3, thyroxin - T4) and steroid (testosterone, estradiol, progesterone) hormone levels was examined in Lipizzan horses of both sexes and various age groups. Serum T3, T4, testosterone and estradiol concentrations were measured by radioimmunoassays (RIA) and serum progesterone concentrations by enzyme immunoassay (EIA). The mean T3 and T4 levels in Lipizzans were in the normal range for warm-blooded horses, but age, sex and pregnancy-dependent variations were observed for both hormones. Testosterone concentrations increased with age in stallions. Changes in progesterone and estradiol concentrations were found in fillies and pregnant and barren mares, indicating the onset of puberty, cyclic ovarian activity and pregnancy.
Summary		Proučevali smo spremembe koncentracije ščitničnih (trijodtironin - T3, tiroksin T4) in steroidnih (testosteron, estradiol, progesteron) hormonov v serumu lipicancev obeh spolov in različnih starosti. Koncentracije T3, T4, testosterona in estradiola smo izmerili z radioimunskim (RIA), koncentracijo progesterona pa z encimskoimunskim postopkom (EIA). Povprečne vrednosti T3 in T4 pri lipicancih so bile znotraj normalnih vrednosti za toplokrvne konje, vendar pa smo pri obeh hormonih ugotovili vpliv starosti, spola in brejosti. Pri žrebcih je koncentracija testosterona naraščala s starostjo. Med žrebicami, brejimi in jalovimi kobilami smo ugotovili razlike v koncentracijah progesterona in estradiola, ki kažejo začetek pubertete, ciklično aktivnost jajčnikov in brejost.
Descriptors		TRIIODOTHYRONINE THYROXINE TESTOSTERONE ESTRADIOL PROGESTERONE HORSES IMMUNOENZYME TECHNIQUES RADIOIMMUNOASSAY AGE FACTORS SEX FACTORS