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Investigation of nitrogen balance in dairy cows and steers nourished by intragastric infusion

Effects of submaintenance energy input with or without protein

Published online by Cambridge University Press:  09 March 2007

E. R. Ørskov ,
N. A. MacLeod ,
S. T. M. Fahmy ,
L. Istasse  and
F. D. DeB. Hovell
E. R. Ørskov
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
N. A. MacLeod
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
S. T. M. Fahmy
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
L. Istasse
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
F. D. DeB. Hovell
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Abstract

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1. Two dairy cows were maintained by intragastric infusion of volatile fatty acids and casein. Except when fasting, the casein-nitrogen was held constant, while total gross energy supply was varied from zero during fasting to 650 kJ/kg body-weight (W)0·75.

2. One cow was estimated to attain zero N balance at an energy intake of 255 kJ/kg W0·75 and the other at 307 kJ/kg W0·75, which was calculated to be substantially below the estimated energy required for zero energy balance.

3. When the cows were later given an N-free infusion for a period preceding the trial, N balance occurred at 98 kJ/kg W0·75 for one cow and 115 kJ/kg W0·75 for the other.

4. Four steers were similarly nourished by intragastric infusion and the energy nutrient increased from 0 at fasting to 450 kJ/kg W0·75. The protein was held constant at 1 g N/kg W0·75 except at fasting. The energy level at which N balance occurred was 154 (SE 38) kJ/kg W0·75 or approximately equal to the energy content of the protein. The practical implications of these findings are discussed.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 50 , Issue 1 , July 1983 , pp. 99 - 107
Copyright
Copyright © The Nutrition Society 1983

References

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