References
- Gaisford , M. J. 1965 . The application of shell strength measurements in egg shell quality determination . Br. Poult. Sci. , 6 : 193 – 196 .
- Schoorl , P. and Boersma , H. Y. 1962 . Research on the quality of the egg shell. A new method of determination . Proc. 12th Wld's Poult. Congr. , : 432 – 435 .
- Tyler , C. 1961 . Studies on egg shells. XVI. Variations in shell thickness over different parts of the same shell . J. Sci. Fd Agric. , 12 : 459 – 470 .
- Tyler , C. and Geake , F. H. 1961 . Studies on egg shells. XV. Critical appraisal of various methods of assessing shell thickness . J. Sci. Fd Agric , 12 : 281 – 289 .
- Wells , R. G. 1967 . Egg shell strength. 1. The relationship between egg breakage in the field and certain laboratory assessments of shell strength . Br. Poult. Sci. , 8 : 131 – 139 .
- Present address: B.E.M.B. Experimental Unit, Edgmond, Newport, Shropshire.