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Changes in egg shell thickness and white and yolk weight and composition over a period of a year

Published online by Cambridge University Press:  27 March 2009

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

A study has been made of all eggs laid over a year (March-March) by twelve birds.

It was found that:

1. Shell thickness, yolk weight and white weight all increased with time.

2. For each individual bird a linear relationship existed between yolk weight and yolk calcium weight and between yolk weight and yolk phosphorus weight.

3. High calcium diets significantly increased shell thickness at the beginning of the experiment and yolk calcium around the middle of the experiment. Dietary calcium levels had no other effects and dietary phosphorus levels no effects at all.

4. The ‘curves’ relating shell thickness and time for each individual bird are discussed in relation to the relative merits of different birds as producers of thick shells.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 55 , Issue 3 , December 1960 , pp. 323 - 331
Copyright
Copyright © Cambridge University Press 1960

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References

REFERENCES

Jenkins, N. K. & Tyler, C. (1960). J. Agric. Sci. 54, 131.CrossRefGoogle Scholar
Mueller, C. D. & Scott, H. M. (1940). Poult. Sci. 19, 163.CrossRefGoogle Scholar
Tyler, C. & Geake, F. H. (1958). J. Sci. Fd Agric. 9, 473.CrossRefGoogle Scholar
Tyler, C. & Geaxe, F. H. (1960). J. Sci. Fd Agric. (in the Press).Google Scholar