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Effects on plasma insulin of intermittent infusions of propionic acid, glucose or casein into the alimentary tract of non-lactating cows maintained on a liquid diet

Published online by Cambridge University Press:  09 March 2007

L. Istasse ,
N. A. Macleod ,
E. D. Goodall  and
E. R. Ørskov
L. Istasse
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
N. A. Macleod
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
E. D. Goodall
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
E. R. Ørskov
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Abstract

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1. An experiment was conducted using three non-lactating cows completely maintained by infusions of volatile fatty acids into the rumen, and casein into the abomasum. Plasma insulin responses to propionic acid, glucose or casein were recorded. Further information was obtained using protein-free infusions.

2. When part of the propionic acid was infused into the rumen in a twice-daily 3 h dose and the remainder infused continuously with acetic and butyric acids and casein, there were large increases in the concentrations of propionic acid and insulin in the jugular blood. When glucose, corresponding in energy to that supplied by the intermittent propionic acid infusions was similarly infused, the plasma levels of glucose and insulin were increased. Glucose appeared to stimulate a greater increase in insulin than did propionic acid. Casein infused into the abomasum in intermittent doses produced a rise in plasma insulin, but smaller than that observed with propionic acid or with glucose.

3. The protein-free infusion was characterized by a lower concentration of insulin in the blood plasma, a reduction in plasma urea and free amino nitrogen and unchanged plasma glucose.

Type
General Nutrition papers
Information
British Journal of Nutrition , Volume 58 , Issue 1 , July 1987 , pp. 139 - 148
Copyright
Copyright © The Nutrition Society 1987

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