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A critical study of the failure of a long-term calcium and phosphorus balance experiment with laying hens

Published online by Cambridge University Press:  27 March 2009

N. K. Jenkins  and
C. Tyler
N. K. Jenkins
Affiliation:
Department of Physiological Chemistry, University of Reading
C. Tyler
Affiliation:
Department of Physiological Chemistry, University of Reading
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Extract

A long-term calcium and phosphorus balance experiment with laying hens is described.

The cumulative balances of calcium and phosphorus over a whole year were seen to be physiologically impossible.

Results from other workers using short term balances could be equally impossible and a similar situation has recently been noted in balance experiments with ruminants.

The techniques employed in the experiment were, therefore, investigated in detail.

Only systematic errors could be responsible and it was found that the most likely source of such errors was (a) the spilling of food on to the floor or into the water bowl, and (b) failure to collect all the droppings.

These errors only become apparent in long-term experiments and are more pronounced when diets containing high levels of calcium and/or phosphorus are fed.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 54 , Issue 1 , February 1960 , pp. 131 - 139
Copyright
Copyright © Cambridge University Press 1960

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References

REFERENCES

Common, R. H. (1932). J. Agric. Sci. 22, 576.CrossRefGoogle Scholar
Duncan, D. L. (1958). Nutr. Abstr. Rev. 28, 695.Google Scholar
Gerritz, H. W. (1935). Industr. Engng Chem. (Anal.), 7, 167.Google Scholar
Halnan, E. T. (1925). J. Nat. Poult. Inst. 10, 410.Google Scholar
Kitson, R. E. & Mellon, M. G. (1944). Industr. Engng Chem. (Anal.), 16, 379.Google Scholar
Koenig, R. A. & Johnson, C. R. (1942). Industr. Engng Chem. (Anal.), 14, 155.Google Scholar
Morgan, C. L. & Mitchell, J. H. (1938). Poult. Sci. 17, 99.CrossRefGoogle Scholar
Russell, W. C. & McDonald, P. G. (1929). J. Biol. Chem. 84, 463.CrossRefGoogle Scholar
Tyler, C. & Geake, F. H. (1953). J. Sci. Fd Agric. 4, 587.CrossRefGoogle Scholar
Tyler, C. & Willcox, J. S. (1942). J. Agric. Sci. 32, 43.CrossRefGoogle Scholar
Wheatley, V. R. (1944). Analyst, 69, 207.CrossRefGoogle Scholar