Quality of eggs from different laying hen production systems, from indigenous breeds and specialty eggs
Autor: | Madalena Lordelo, Rui J.B. Bessa, Evandro de Abreu Fernandes, Susana P. Alves |
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Rok vydání: | 2016 |
Předmět: |
0301 basic medicine
Veterinary medicine food.ingredient Eggs Biology Egg Proteins Dietary Protein content 03 medical and health sciences food Animal science Yolk Fatty Acids Omega-3 Animals Animal Husbandry Production system chemistry.chemical_classification Portugal 0402 animal and dairy science 04 agricultural and veterinary sciences General Medicine 040201 dairy & animal science Animal Feed Diet 030104 developmental biology chemistry embryonic structures Animal Science and Zoology Animal Nutritional Physiological Phenomena Food Organic Chickens Polyunsaturated fatty acid |
Zdroj: | Poultry science. 96(5) |
ISSN: | 1525-3171 |
Popis: | Consumers are concerned about the quality of commercially available eggs. Eggs used in this study were marketed in Portugal and originated from laying hens raised in cages, barns, free-range, organic eggs, and eggs enriched with n-3 polyunsaturated fatty acids (PUFA), and from native Portuguese breeds. The eggs were analyzed for chemical and physical properties. Results indicated that yolk color was lighter in organic eggs and darker in n-3 PUFA enriched eggs. Eggs from caged hens had lower Haugh units in contrast with organic eggs. Caged hens produced eggs with a higher protein content while organic eggs had the lowest level of protein in the albumen. As might be expected, eggs enriched in n-3 PUFA had the highest n-3 PUFA content. Choosing an egg by its production system or labeling specificities may not be a guarantee of superior product quality. The layer genotype, age, diet, and the quality of the range also may affect egg properties. Due to a different layer diet, enriched eggs seem to be of superior quality. |
Databáze: | OpenAIRE |
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