The Effect of Fasting Duration on Baseline Blood Glucose Concentration, Blood Insulin Concentration, Glucose/Insulin Ratio, Oral Sugar Test, and Insulin Response Test Results in Horses

Objectives Published descriptions of the oral sugar test (OST) and insulin response test (IRT) have been inconsistent when specifying the protocol for fasting horses before testing. The purpose of our study was to examine the effect of fasting duration on blood glucose concentration, blood insulin c...

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Bibliographic Details
Published in:Journal of veterinary internal medicine 2016-09, Vol.30 (5), p.1726-1731
Main Authors: Bertin, F.R., Taylor, S.D., Bianco, A.W., Sojka‐Kritchevsky, J.E.
Format: Article
Language:English
Subjects:
Animals
Blood Glucose - drug effects
Clinical pathology
Endocrinology
EQUID
Equine
Food Deprivation - physiology
Glucose metabolism
Glucose Tolerance Test - veterinary
Horses - blood
Horses - metabolism
Insulin - blood
Insulin - metabolism
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Summary:Objectives Published descriptions of the oral sugar test (OST) and insulin response test (IRT) have been inconsistent when specifying the protocol for fasting horses before testing. The purpose of our study was to examine the effect of fasting duration on blood glucose concentration, blood insulin concentration, glucose/insulin ratio, OST, and IRT results in horses. Animals Ten healthy adult horses. Procedures Both OST and IRT were performed on horses without fasting and after fasting for 3, 6, and 12 hours. Thus, 8 tests were performed per horse in a randomized order. Blood collected at the initial time point of the OST was analysed for both blood glucose and serum insulin concentrations so that baseline concentrations and the glucose/insulin ratio could be determined. Unless fasted, horses had free‐choice access to grass hay. Results There was no effect of fasting and fasting duration on blood glucose concentration, serum insulin concentration, glucose/insulin ratio, or the OST. Response to insulin in the IRT was decreased in fasted horses. The effect increased with fasting duration, with the least response to insulin administration after a 12‐hour fast. Conclusions and Clinical Relevance These data indicate that insulin sensitivity is not a fixed trait in horses. Fasting a horse is not recommended for a glucose/insulin ratio or IRT, and fasting a horse for 3 hours is recommended for the OST.
ISSN:0891-6640
1939-1676
DOI:10.1111/jvim.14529