Effect of long‐term overfeeding of a high‐energy diet on glucose tolerance in Shetland pony mares
Background Overfeeding is associated with obesity and insulin dysregulation (ID), which are both risk factors for equine metabolic syndrome. How chronic overfeeding affects development of these factors is poorly understood. Objectives To examine the influence of long‐term high‐energy diet provision...
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Published in | Journal of veterinary internal medicine Vol. 34; no. 3; pp. 1339 - 1349 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Hoboken, USA
John Wiley & Sons, Inc
01.05.2020
Wiley |
Subjects | |
Online Access | Get full text |
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Summary: | Background
Overfeeding is associated with obesity and insulin dysregulation (ID), which are both risk factors for equine metabolic syndrome. How chronic overfeeding affects development of these factors is poorly understood.
Objectives
To examine the influence of long‐term high‐energy diet provision on body condition and ID.
Animals
Eleven Shetland pony mares.
Methods
In a 3‐phase study, the high‐energy group (n = 7) was fed 200% of net energy (NE) requirements (hay; concentrate: 36% sugar and starch, 13% fat) for 24 weeks, followed by 17 weeks hay‐only feeding before resuming the high‐energy diet (n = 4) for an additional 29 weeks. Mares were weighed weekly. Oral glucose tolerance tests were performed 3 to 4 times per dietary period. Results were compared with those of a control group (phase 1, n = 4; phases 2 and 3, n = 6) that received 100% NE requirements, using a general linear mixed model with post hoc Bonferroni testing.
Results
The mean body weight of the high‐energy group increased by 27% per high‐energy feeding period. During both feeding periods, area under the curve (AUC) for plasma glucose concentration decreased (P < .01), whereas AUC for plasma insulin concentration increased. Mean basal plasma glucose concentration and peak plasma insulin concentrations were higher (P < .05) in the high‐energy group than in the control group.
Conclusion and Clinical Importance
Feeding a high‐energy diet to healthy nonobese Shetland pony mares led to more efficient glucose metabolism within 5 weeks, followed by significant hyperinsulinemia and obesity. Hyperinsulinemic status was reversed during 17 weeks of hay‐only feeding, regardless of body condition, but returned rapidly after restarting the high‐energy diet. |
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Bibliography: | Funding information FP7 People: Marie‐Curie Actions, Grant/Award Number: 317146; PAVO ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Funding information FP7 People: Marie‐Curie Actions, Grant/Award Number: 317146; PAVO |
ISSN: | 0891-6640 1939-1676 |
DOI: | 10.1111/jvim.15788 |