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Open AccessArticle

Evaluation of Quality of Eggs from Hens Kept in Caged and Free-Range Systems Using Traditional Methods and Ultra-Weak Luminescence

1
Faculty of Biotechnology and Food Sciences, Lodz University of Technology, 90-924 Łódź, Poland
2
Institute of Electrical Engineering Systems, Lodz University of Technology, 90-924 Łódź, Poland
3
Faculty of Production and Power Engineering, University of Agriculture in Krakow, 30-149 Kraków, Poland
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(12), 2430; https://doi.org/10.3390/app9122430
Received: 26 April 2019 / Revised: 5 June 2019 / Accepted: 10 June 2019 / Published: 14 June 2019
The paper presents the results of an evaluation of the quality of eggs from laying hens kept in caged and free range systems using traditional methods and ultra-weak luminescence (USL). It was found that the tested eggs were fresh and were characterized by the required quality, as demonstrated by analysis of the egg white and egg yolk. Eggs from free-range laying hens were characterized by an eight-fold higher emission of photons compared to eggs from caged hens, and they had over three times higher content of natural antioxidants in the form of carotenoids. Most probably, the higher number of photons emitted is associated with a higher content of biologically active substances in the material under study. Photon emission also varies in different ways depending on the specific hen breeding system. Differences in time in the identified maximum values of photon emission result from the composition of individual parts of the egg. Different times in which the emission peaks occurred for free-range eggs and for caged eggs were observed. The application of the USL method in order to confirm its usefulness in the assessment of food quality requires further research. View Full-Text
Keywords: ultra-weak luminescence; eggs quality; traditional food ultra-weak luminescence; eggs quality; traditional food
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Gałązka-Czarnecka, I.; Korzeniewska, E.; Czarnecki, A.; Sójka, M.; Kiełbasa, P.; Dróżdź, T. Evaluation of Quality of Eggs from Hens Kept in Caged and Free-Range Systems Using Traditional Methods and Ultra-Weak Luminescence. Appl. Sci. 2019, 9, 2430.

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