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Effect of zinc deficiency on appetite and plasma amino acid concentrations in the rat

Published online by Cambridge University Press:  09 March 2007

J. C. Wallwork ,
G. J. Fosmire  and
H. H. Sandstead
J. C. Wallwork
Affiliation:
United States Department of Agriculture, Science and Education Administration, Grand Forks Human Nutrition Research Center, Grand Forks, North Dakota, 58202, USA
G. J. Fosmire
Affiliation:
United States Department of Agriculture, Science and Education Administration, Grand Forks Human Nutrition Research Center, Grand Forks, North Dakota, 58202, USA
H. H. Sandstead
Affiliation:
United States Department of Agriculture, Science and Education Administration, Grand Forks Human Nutrition Research Center, Grand Forks, North Dakota, 58202, USA
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Abstract

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1. Levels of zinc in liver and plasma of the Zn-depleted rats fluctuated with the feeding cycle and were significantly higher at the bottom than at the top of the cycle. As Zn deficiency became more severe fluctuations in plasma Zn diminished. Concentrations of Zn in liver, in contrast to levels in plasma and femur, were not markedly lowered by day 15.

2. In contrast to udlib.-fed (AL) and overnight-fasted (OF) controls, some pair-fed (PF) controls had elevated levels of Zn in liver and plasma.

3. Intakes of water and food were sigdicantly correlated in Zn-deficient rats. Packed cell volumes were significantly higher for Zn-depleted than for AL and PF rats.

4. Food intakes and plasma glucose concentrations were related in AL, OF and PF control rats but not in Zn-deficient rats.

5. At day 15 of Zn deficiency the order of total plasma amino acid concentrations in the groups of rats was AL > Zn-deficient > OF > PF. Many of the differences between the AL and OF groups for individual plasma amino acids also appeared in the Zn-deficient group at the top and bottom of the feeding cycle. Differences in individual amino acid conmntrations at the top and bottom of the feeding cycle tended to be opposite in the PF and the Zn-ddicient group. Levels of tyrosine and tryptophan in plasma were correlated (P ≶ 0.05) with the cyclic feeding pattern of the Zn-deficient group; however, the ratios tryptophan or tyrosine: sum of other large neutral amino acids did not correlate significantly with the eating habits of Zndeficient rats.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 45 , Issue 1 , January 1981 , pp. 127 - 136
Copyright
Copyright © The Nutrition Society 1981

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