title: [Reference values for cortisol, T4 and T-uptake in different horse groups using the fluorescence polarization immunoassay (FPIA)].
abstract: Reference values for Cortisol, T4 and T-Uptake, determined with the Fluorescence-Polarization-Immunoassays (FPIAs) in blood-plasma of different horse groups were established. The highest Cortisol values were measured in blood samples from thoroughbred racehorses and riding horses taken between 7 and 8 a.m. (181 +/- 37 and 268 +/- 43 nmol/l), the lowest gained between 5 and 6 p.m. (69 +/- 45 and 85 +/- 32 nmol/l respectively). Peak values for T4 in riding horses were found in blood samples collected between 1 and 2 p.m. (28.2 +/- 5.7 nmol/l) followed by the samples taken at 5-6 p.m. and 7-8 a.m. T-Uptake values did not show a diurnal variation. Values of thoroughbred racehorses were much lower than in thoroughbred broodmares and riding horses (0.11 +/- 0.03, 0.18 +/- 0.03 and 0.24 +/- 0.05 units). The blood samples collected on 5 successive days showed significant variations for Cortisol. T4-values were stable whilst T-Uptake had small variations.
authors.affiliation: Institut für Anatomie, Physiologie und Hygiene der Haustiere, Bonn.
authors.forename: A
authors.initials: A
authors.lastname: Lindner
authors.forename: Y
authors.initials: Y
authors.lastname: Will
authors.forename: J
authors.initials: J
authors.lastname: Chrispeels
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D005260:Female; D016231:Fluorescence Polarization Immunoassay; D006736:Horses / Q000097:blood*; D006854:Hydrocortisone / Q000097:blood*; D008297:Male; D012016:Reference Values; D013963:Thyroid Hormones / Q000378:metabolism*; D013974:Thyroxine / Q000097:blood*
chemical_list: D013963:Thyroid Hormones; D013974:Thyroxine; D006854:Hydrocortisone
vernacular_title: Referenzwerte für Cortisol, T4 and T-Uptake bei verschiedenen Pferdegruppen bestimmt mittels Fluoreszenz-Polarisations-Immunoassays (FPIAs).