Recent years have seen increased interest in the influence of bioactive dietary components on humangenes and gene expression. A good source of many bioactive substances is the chicken egg. The egg is consideredto be an excellent food provided by nature. It is a good source of nutrients such as vitamins A, B2, B6, B12, D,E and K, as well as elements including phosphorus, selenium, iron, zinc, magnesium and calcium. The researchmaterial use in this study consisted of eggs from hens kept in two different systems: organic and battery cages.The content of calcium (Ca), magnesium (Mg) and zinc (Zn) was determined in the egg contents – in the yolkand white respectively. The content of elements was determined by atomic absorption spectrometry (AAS) usingan AA280 FS spectrometer with the automatic dilution of standards and samples. The eggs from the organicallyraised hens had a higher calcium, magnesium and zinc content. The greater variation in the Ca, Mg and Zncontent in the organic eggs is due to the more individualized feeding system. The rearing system of the henssignificantly affects the concentration of elements in the egg. The results of this research indicate that eggs fromorganic farming systems have a richer chemical composition in terms of the content of nutrients such as calcium,magnesium and zinc compared with eggs obtained from caged hens. Therefore, consumers purchasing eggsshould consider the system in which the hens were reared, as eggs can be a valuable source of these elements inthe diet.