Fluctuations in the Porosity of Egg-Shells

Abstract

DURING the course of an experiment designed to study the effect of different levels of dietary calcium on various egg-shell characteristics, measurements were made of the porosity of egg-shells. Eggs were collected from twelve birds in all during a period lasting from mid-December to mid-January. At first, four birds received a high-, four a medium-, and four a low-calcium diet; later, all twelve received the medium-calcium diet. A basal ration low in calcium was used, and to this was added 8, 4 and 0 per cent of calcium carbonate to give the high-, medium- and low-calcium diets respectively.