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Abstract
Sloan, D.R., Harms, R.H., Abdullah, A.G. and Kuchinski, K.K. 2000. Variation in egg content density makes egg specific gravity a poor indicator of shell weight. J. Appl. Anim. Res., 18: 121–128.
A study was conducted to measure the variability in egg content specific gravity (ECSG) among breeds and strains, and ages of laying hens. Also information is presented concerning how the specific gravity of egg content (EC) affects the specific gravity of egg (ESG). The observed ECSG ranged from a low of 1.0298 to a high of 1.0352. Based on the formula of Harms et al. (1990) a change of ECSG from 1.029 to 1.035 would change the ESG from 1.0823 to 1.0883 and the eggshell weight from 5.64 to 6.18 g. ECSG on a commercial farm ranged from 1.0323 to 1.0352. This resulted in calculated ESG from 1.0856 to 1.0885 and calculated SW from 5.84 to 6.21g. Researchers and industrymen must be very careful in using ESG data in making decisions relating to eggshell quality.