Eggs were obtained from 8 difference sources (6 chickens, 1
duck, 1 quail) at local markets, a commercial farmer, small private
producers and the zoological garden of Berlin, Germany. A total
number of 80 eggs (10 from each source) were considered. Eggs
were cleaned by distilled water and dried at room temperature.
After breaking the eggs albumen and egg yolk was separated. Yolk
content was collected after rupturing the yolk membrane and the
yolk was thoroughly mixed and aliquoted before analysis. Each
yolk was extracted and analysed in triplicates for each method.