Evaluation of the effects of pregnancy on insulin sensitivity, insulin secretion, and glucose dynamics in Thoroughbred mares
| Autor: | Kibby H. Treiber, Patricia A. Harris, Tania A. Cubitt, Raymond J. Geor, Lindsey A George, W. Burton Staniar |
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| Rok vydání: | 2011 |
| Předmět: |
Blood Glucose
endocrine system medicine.medical_specialty medicine.medical_treatment Insulin resistance Pregnancy Internal medicine Insulin Secretion medicine Animals Insulin Horses Insulin secretion Glucose dynamics reproductive and urinary physiology Glycemic General Veterinary business.industry Insulin sensitivity General Medicine Glucose Tolerance Test medicine.disease Diet Pedigree Endocrinology Gestation Animal Nutritional Physiological Phenomena Female Insulin Resistance business Energy Intake |
| Zdroj: | American journal of veterinary research. 72(5) |
| ISSN: | 1943-5681 |
| Popis: | Objective—To characterize the effects of pregnancy on insulin sensitivity (SI) and glucose dynamics in pasture-maintained mares fed supplemental feeds of differing energy composition. Animals—Pregnant (n = 22) and nonpregnant (10) healthy Thoroughbred mares. Procedures—Pregnant and nonpregnant mares underwent frequently sampled intravenous glucose tolerance tests at 2 times (period 1, 25 to 31 weeks of gestation; period 2, 47 weeks of gestation). Following period 1 measurements, mares were provided a high-starch (HS; 39% starch) or high-fat and -fiber (14% fat and 70% fiber) supplemental feed. From a subset of mares (n = 12), blood samples were collected hourly for 24 hours to assess glycemic and insulinemic response to feeding while pastured. The minimal model of glucose and insulin dynamics was used to estimate SI, glucose effectiveness, and acute insulin response to glucose from tolerance testing data. Results—Pregnant mares during period 1 had a lower SI and glucose effectiveness and higher acute insulin response to glucose than did nonpregnant mares. The SI value decreased in nonpregnant but not pregnant mares from periods 1 to 2. Pregnant mares fed HS feed had a greater glycemic and insulinemic response to feeding than did any other group. Conclusions and Clinical Relevance—Pregnant mares had slower glucose clearance and greater insulin secretion at 28 weeks of gestation than did nonpregnant mares. Glucose and insulin responses to meal feeding, particularly with HS feed, were greater in pregnant mares, indicating that pregnancy enhanced the postprandial glycemic and insulinemic effects of starch-rich feed supplements. |
| Databáze: | OpenAIRE |
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