The Effects of Feed Form on Consumption Time and Glucose and Insulin Response to a Concentrate Meal in Equine |
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Authors: | Mary E Gordon PhD Michael L Jerina BS Randel H Raub PhD Karen E Davison PhD J Kathleen Young PhD |
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Institution: | aLand O'Lakes, Purina Feed, Gray Summit, MO |
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Abstract: | This study tested the hypothesis that feeding an identically formulated, low sugar and starch concentrate in three forms (5-mm extruded E], 4-mm pellet P], and 19-mm oval O]) would affect consumption rate and glucose or insulin responses, or both. Horses received 1.8 kg treatment feed in a randomized, crossover design, with samples taken every 30 minutes for 6 hours for blood glucose and insulin response. Pearson's correlation compared consumption time, insulin and glucose peak, and time to peak insulin and glucose. The pellet (P) elicited a lower (P = .01) glucose concentration at 2.5 hours than O. The pellet also elicited a lower (P = .03) insulin concentration at 5.5 hours than E and O. There were no differences (P > .05) in area under the curve (AUC) insulin, peak insulin, and time to peak insulin for the three treatments. Average insulin concentration was lower (P = .01) for P versus O. There were no differences (P > .05) in average insulin between P and E, nor between O and E. There were no differences (P > .05) in AUC and peak glucose concentration. Time to peak glucose was longer (P = .04) for P versus E. Average glucose concentration was lower (P = .02) for P versus O. Consumption time was longer (P = .03) for O versus P. There was a positive correlation between consumption time and time to peak insulin (r = 0.46, P = .029). Further research on feeding practices, feed forms, and consumption times that affect glycemic response is necessary. |
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Keywords: | Carbohydrate Equine Feed Glucose Insulin |
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