The Technologycal Study to Improve Calcium Absorption of Eggshell

摘要

About 110 billion tons of eggshells are produced globally and the ultimate destination is the landfills, waste utilization and these eggshells are rich source of minerals especially calcium. Calcium carbonate comprises more than 90% by weight of an eggshell. The main purpose of the study to determine an appropriate condition and process for enriching absorption of calcium carbonate in chicken eggshell. In terms of that we have conducted several different kinds of studies and processes in dissolved eggshell with lemon juice and citric acid and dried it up then tested samples by technological experiments. The result revealed that: (1) By adding dissolved eggshell to 12% of the weight of citric acid and extracting at a temperature of 4for 14 days and drying for 5-6 hours at 50C is determined as the most appropriate condition. (2) The amount of calcium contained in blood serum of the rabbit fed with test samples showed that 35.2% more than the control rabbit at 21 day, and the amount of calcium released in manure were 2.5 times less than rabbits fed with the eggshell only, indicating that calcium absorption is improving.