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Tytuł pozycji:

Circannual variation in plasma adrenocorticotropic hormone concentrations and dexamethasone suppression test results in Standardbred horses, Andalusian horses and mixed-breed ponies.

Tytuł:
Circannual variation in plasma adrenocorticotropic hormone concentrations and dexamethasone suppression test results in Standardbred horses, Andalusian horses and mixed-breed ponies.
Autorzy:
Bamford NJ; Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria, Australia.
Harris PA; Equine Studies Group, WALTHAM Petcare Science Institute, Melton Mowbray, Leicestershire, UK.
Bailey SR; Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria, Australia.
Źródło:
Australian veterinary journal [Aust Vet J] 2020 Dec; Vol. 98 (12), pp. 616-621. Date of Electronic Publication: 2020 Oct 01.
Typ publikacji:
Journal Article
Język:
English
Imprint Name(s):
Publication: Oxford : Wiley-Blackwell Pub.
Original Publication: New South Wales : Australian Veterinary Association
MeSH Terms:
Horse Diseases*
Pituitary Diseases*/veterinary
Adrenocorticotropic Hormone ; Animals ; Breeding ; Dexamethasone ; Horses ; Hydrocortisone
References:
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Grant Information:
Australian Research Council; WALTHAM Centre for Pet Nutrition
Contributed Indexing:
Keywords: breed; endocrine; equine; hormone; laminitis; pituitary pars intermedia dysfunction
Substance Nomenclature:
7S5I7G3JQL (Dexamethasone)
9002-60-2 (Adrenocorticotropic Hormone)
WI4X0X7BPJ (Hydrocortisone)
Entry Date(s):
Date Created: 20201001 Date Completed: 20201204 Latest Revision: 20201214
Update Code:
20240105
DOI:
10.1111/avj.13022
PMID:
33001453
Czasopismo naukowe
Objective: To compare circannual plasma concentrations of adrenocorticotropic hormone (ACTH) and seasonal dexamethasone suppression test (DST) results between three different equine breed groups.
Methods: Six Standardbred horses, six Andalusian horses and six mixed-breed ponies were followed over a 1-year period, during which time groups were managed identically. Blood samples were collected monthly (around the autumn equinox) or in every second month (other times of the year) for the determination of plasma ACTH concentrations using a chemiluminescent immunoassay. Overnight DSTs were performed quarterly, with suppression of plasma cortisol to below 27 nmol/L at 19 h considered a normal result.
Results: Seasonal variation in plasma ACTH concentrations was present among all breed groups with, as expected, higher levels detected around the autumn equinox, from February to April (P < 0.001). Plasma ACTH concentrations were different between breed groups in March, with higher levels in Andalusians compared with Standardbreds (P = 0.048) and in ponies compared with Standardbreds (P = 0.010). Suppression of cortisol during the DST was normal for all animals in winter, spring and summer, but five Andalusians and three ponies returned abnormally high results in autumn, compared with zero Standardbreds.
Conclusion: Higher plasma ACTH concentrations and more false-positive DST results were obtained during autumn in ponies and Andalusian horses when compared with Standardbred horses. Potential differences between breeds should be considered when interpreting test results for horses and ponies that are evaluated for pituitary pars intermedia dysfunction. Further work is recommended to establish population-based reference intervals and clinical cut-off values for ACTH in different equine breeds.
(© 2020 Australian Veterinary Association.)

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