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Effects of feeding state on glycaemic and insulinaemic responses to a starchy meal in horses: a methodological approach

Published online by Cambridge University Press:  22 May 2009

I. Vervuert ,
S. Klein  and
M. Coenen
I. Vervuert*
Affiliation:
Institute of Animal Nutrition, Nutrition Diseases and Dietetics, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
S. Klein
Affiliation:
Institute of Animal Nutrition, Nutrition Diseases and Dietetics, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
M. Coenen
Affiliation:
Institute of Animal Nutrition, Nutrition Diseases and Dietetics, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
*
†E-mail: Ingrid.Vervuert@vetmed.uni-leipzig.de
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Abstract

A standardised methodology is required for classification of starchy diets. One important question is what feeding status is optimal to describe glycaemic and insulinaemic responses to the respective starchy diet. Four horses were fed, in a randomised order, four different feeding protocols relative to offering hay before or after cracked corn (CC): (i) ad libitum hay for 12 h before feeding CC and ad libitum hay after CC intake for 9 h (+CC+), (ii) ad libitum hay for 12 h before feeding CC and no hay after CC intake for 9 h (+CC−), (iii) feed restriction for 12 h before feeding CC and ad libitum hay after CC intake for 9 h (−CC+) and (iv) 1.2 kg hay/100 kg body weight (BW) per day, divided into two equal portions and offered at 0900 h and 1900 h, feed restriction for 12 h before feeding CC and no hay after CC intake for 9 h (−CC−). CC intake was adjusted to a starch intake of 2 g/kg BW. The different hay offerings did not affect basal plasma glucose and insulin levels. A significant rise in plasma glucose and insulin was found after CC intake for all diets. The highest peak glucose levels were analysed for −CC+, and the lowest glucose peaks were found for +CC− (diet P < 0.05). The highest insulin peaks were monitored for −CC+ (31.27 ± 18.19 μU/ml) and lower peaks for +CC− (13.36 ± 2.93 μU/ml) (diet P < 0.05). Insulin for −CC− and +CC− returned to resting values about 300 min after CC feeding. For +CC+ and −CC+, insulin levels were still above resting levels 510 min after CC intake (diet P < 0.05). The present data suggest that feed restriction for 12 h before feeding the starchy diet and no further roughage intake during blood sampling period provide the best-defined conditions.

Keywords

feed restrictionstarch intakeglucoseinsulinhorses
Type
Full Paper
Information
animal , Volume 3 , Issue 9 , September 2009 , pp. 1246 - 1253
Copyright
Copyright © The Animal Consortium 2009

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