References
- DIKMEN B.Y., GUNDUZ M., KASIF A., SEVINC B.F. 2025 - Determination of genotype, housing system and age effect on egg production and quality traits of layers. Journal of Poultry Research 22, 1, 7-17.
- FAO. 2023. FAOSTAT: Production: Crops and livestock products. [Accessed on 15 November 2024]. https://www.fao.org/faostat/en/#data/QCL. Licence: CC-BY-4.0.
- Food Business. 2024. https://www.ciwf.pl/media/7460334/polski-rynek-jaj-2024-food-business-compassion-in-world-farming-polska.pdf
- GU Y.F., CHEN Y.P., JIN R., WANG C., WEN C., ZHOU Y.M., 2021 - A comparison of intestinal integrity, digestive function, and egg quality in laying hens with different ages. Poultry Science 100, 100949.
- HABIG C., GEFFERS R., DISTL O., 2012 - Differential Gene Expression from Genome-Wide Microarray Analyses Distinguishes Lohmann Selected Leghorn and Lohmann Brown Layers. PLoS ONE 7, e46787.
- HAMMERSHOJ M., KRISTIANSEN G.H., STEENFELDT S., 2021 - Dual-purpose poultry in organic egg production and effects on egg quality parameters. Foods 10, 897.
- HEJDYSZ M., NOWACZEWSKI S., PERZ K., SZABLEWSKI T., STUPER-SZABLEWSKA K., CEGIELSKA-RADZIEJEWSKA R., TOMCZYK R., PRZYBYLSKA-BALCEREK A., BUSKO M., KACZMAREK S.A., SLOSARZ P., 2024 - Influence of the genotype of the hen (Gallus gallus domesticus) on main parameters of egg quality, chemical composition of the eggs under uniform environmental conditions. Poultry Science 103, 103165.
- HERRANZ B., ROMERO C., ARIJA I., SANCHEZ-ROMAN I., ÁLVAREZ M.D., LOPEZ-TORRES M., VIVEROS A., de PASCUAL-TERESA S., CHAMORRO S., 2024 - Enriching eggs with bioactive compounds through the inclusion of grape pomace in laying hens diet: Effect on internal and external egg quality parameters. Foods 13, 1553.
- KRAUS A., ZITA L. 2019 - The effect of age and genotype on quality of eggs in brown egg-laying hybrids. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 67, 2, 407-414.
- KRAWCZYK J., 2017 - The influence of hen genotype and age on the egg quality of Leghorn hens (G-99 and H-22) and Sussex (S-66). Research and Teaching Equipment 22, 94-100.
- KRAWCZYK J., CALIK J. 2018 – Assessment of egg quality in hens included in the animal genetic resources conservation program. FOOD Science Technology Quality 25, 3 (116), 140-150.
- KRD. 2023. Available online: https://krd-ig.com.pl/dzial-hodowli-i-oceny-drobiu/wstawienia/ (accessed on 31 August 2023).
- KUŹNIACKA J., BIESEK J.; BANASZAK M., GRABOWICZ M., ADAMSKI M., 2020 - The quality of eggs from Rosa 1 hens fed diets containing seeds of legume plants (Lupinus luteus L., Lupinus angustifolius, and Pisum sativum) in two laying phases. Animals 10, 1942.
- LEDVINKA Z., TUMOVA E., ENGLMAIEROVA M., PODSEDNICEK M. 2012 - Egg quality of three laying hen genotypes kept in conventional cages and on litter. Archiv f ü r Gefl ü gelkunde 76, 1, 38-43.
- LI S., XU L., ZHAO X., NING Z., ZHENG X., CHEN H., WANG D. 2025 - Study on changes in egg quality traits and genetic parameters of white leghorn hens from 35 to 100 weeks of age. Poultry Science 104, 105502.
- LIU Z., SUN C., YAN Y., LI G., SHI F., WU G., LIU A., YANG N. 2018 - Genetic variations for egg quality of chickens at late laying period revealed by genome-wide association study. Scientific Reports 8, 10832.
- LORDELO M., CID J., CORDOVIL C.M., ALVES S.P., BESSA R.J., CAROLINO I., 2020 - A comparison between the quality of eggs from indigenous chicken breeds and that from commercial layers. Poultry Science 99, 768-1776.
- ROMERO C., YUSTOS J.L., SÁNCHEZ- ROMÁN I., LÓPEZ-TORRES M., CHAMORRO D., 2024 - Assessment of performance and egg quality in laying hens of Spanish indigenous breed Black Castellana as compared with a selected white egg-layer strain. Poultry Science 103, 104096. https://doi.org/10.1016/j.psj.2024.104096
- SHAKER A.S., KIRKUKI S.M.S., AZIZ S.R., JALAL J.B. 2017 - Influence of Genotype and Hen Age on the Egg Shape Index. International Journal of Biochemistry, Biophysics & Molecular Biology 2, 6, 68-70.
- SIRRI F., ZAMPIGA M., BERARDINELLI A., MELUZZI A.,2018 -Variability and interaction of some egg physical and eggshell quality attributes during the entire laying hen cycle. Poultry Science 97, 1818-1823.
- VLČKOVÁ J., TUMOVA E., MIKOVA K., ENGLMAIEROVA M., OKROUHLA M., CHODOVA Ch., 2019 - Changes in the quality of eggs during storage depending on the housing system and the age of hens. Poultry Science 98, 6187-6193.
- WEGNER M., KOKOSZYŃSKI D., KOTOWICZ M., ŻOCHOWSKA-KUJAWSKA J., NĘDZAREK A., WŁODARCZYK K., 2024 - Influence of genotype on meat quality in laying hens after the egg production season. Agriculture 14, 19.
- ZHANG D.H., ZHAO X.F., REN Z.Z., TONG M.Q., CHEN J.N., LI SH.Y., CHEN H., WANG D.H., 2021 - Comparison between different breeds of laying hens in terms of eggshell translucency and its distribution in various ends of the eggshell. Poultry Science 100, 101510.