[AOAC (1997). Official methods of analysis. Association of Official Analytical Chemists. 15th Edition. Washington, DC.]Search in Google Scholar
[Baucells M.D., Crespo N., Barroeta A.C., López- Ferrer S., Grashorn M.A. (2000). Incorporation of different polyunsaturated fatty acids into eggs. Poultry Sci., 79: 51-59.]Search in Google Scholar
[Bölükbaşi C.Ş., Erhan K.M., Keleş S.M., koçyi ğit R. (2007). Effect of dietary vitamin E and the performance, plasma and egg yolk vitamin Elevels and lipid oxidation of egg in heat stressed layers. J. Appl. Biol. Sci., 1 (3): 19-23.]Search in Google Scholar
[Cherian G., Holsonbake T.B., Goeger M.P. (2002). Fatty acid composition and egg materials of speciality eggs. Poultry Sci., 81: 30-33.]Search in Google Scholar
[Cywa - Benko K. (2002). Genetic and phenotypic characterization of native strains of hens under the biodiversity conservation program (in Polish). Rocz. Nauk Zoot., Rozpr. Hab., 15, 112 pp.]Search in Google Scholar
[Folch J., Lees M., Stanley G.H.S. (1957). Asimple method for the isolation and purification of total lipids from animal tissues. Biol. Chem., 226: 497-509.]Search in Google Scholar
[Hencken H. (1992). Chemical and physiological behavior of feed carotenoids and their effects on pigmentation. Poultry Sci., 71: 711-717.]Search in Google Scholar
[Hidalgo A., Rossi M., Clerici S., Ratti S. (2008). Amarket study on the quality characteristics of egg from different housing systems. Food Chem., 106: 1031-1038.]Search in Google Scholar
[Horsted K., Hammershoj M., Allesen- Holm B. H. (2010). Effect of grass-clover forage and whole-wheat feeding on the sensory quality of eggs. J. Sci. Food Agric., 90: 343-348.]Search in Google Scholar
[Hughes B.O., Dun P., Mccorquodale C.C. (1985). Shell strength of eggs from medium-bodied hybrid hens housed in cages or on range in outside pens. Brit. Poultry Sci., 26: 129-136.]Search in Google Scholar
[Keshavarz K., Nakjima S. (1995). The effect of dietary manipulations of energy, protein and fat during the growing and laying periods on early egg weight and egg materials. Poultry Sci., 74: 50-61.]Search in Google Scholar
[Koreleski J., Świ ątkiewicz S., Arczewska- W łosek A. (2011). Rapeseed cake, glycerin and distillers dried grains with solubles used simultaneously as source of nutrients for hens in their second laying season. Ann. Anim. Sci., 11: 125-133.]Search in Google Scholar
[Krawczyk J. (2009). Effect of layer age and egg production level on changes in quality traits of eggs from hens of conservation breeds and commercial hybrids. Ann. Anim. Sci., 9:: 185-193.]Search in Google Scholar
[Krawczyk J., Soko łowicz Z., Szymczyk B. (2011). Effect of housing system on cholesterol, vitamin and fatty acid content of yolk and physical characteristics of eggs from Polish native hens. Arch. Geflügelkd., 75 (3): 151-157.]Search in Google Scholar
[Leskanich C.O., Noble R.C. (1997). Manipulation of the n-3 polyunsaturated fatty acid composition of avian eggs and meat. World’s Poultry Sci. J., 53: 155-183.]Search in Google Scholar
[Lynch G.L. (1991). Natural occurrence and content of vitamin Ein feedstuffs. In: Coelho M.B. (Ed.), Vitamin Ein Animal Nutrition and Management. BASF, Parsippany, NJ, pp. 43-48.]Search in Google Scholar
[Meluzzi A., Tallarico N., Sirri F., Franchini A. (1997). Changes in the acidic profile of the egg as a response to the dietary administration of refined fish oils. Proc. ASPA Natl. Cong., pp. 347-348.]Search in Google Scholar
[Mendonça C.X. Jr., Almeida C.R.M., Mori A.V., Watanabe C. (2002). Effect of dietary vitamin Aon egg yolk retinol and tocopherol levels. J. Appl. Poultry Res., 11: 373-378.]Search in Google Scholar
[Odabasi A.Z., Miles R.D., Balaban M.O., Portier K.M. (2007). Changes in brown eggshell color as the hen ages. Poultry Sci., 86: 356-363.]Search in Google Scholar
[Pavlovski Z., Hopic S., Lukic M. (2001). Housing systems for layers and egg quality. Biotech. Anim. Husb., 17: 197-201.]Search in Google Scholar
[Rizzi C., Marangon A. (2012). Quality of organic eggs of hybrid and Italian breed hens. Poultry Sci., 91(9): 2330-2340.]Search in Google Scholar
[Rizzi C., Chiericato G.M. (2005). Organic farming production. Effect of age on the productive yield and egg quality of hens of two commercial hybrid lines and two local breeds. Ital. J. Anim. Sci., 4: 160-162.]Search in Google Scholar
[Sarter G. (2004). Entre beldieroumi: preferences des consommateurs urbains et production de poulets au Maroc, Cahiers d’etudes et de recherché francophones. Agricultures, 13: 75-78.]Search in Google Scholar
[Sekeroglu A., Sarica M., Demir E., Ulutas Z., Tilki M., Saatci M. (2008). The effects of housing system and storage length on the quality of eggs produced by two lines of laying hens. Arch. Geflügelkd., 72: 106-109.]Search in Google Scholar
[Simčič M., Stibilj V., Holcman A. (2009). The cholesterol content of eggs produced by the Slovenian autochthonous Styrian hen. Food Chemistry, 114: 1-4.]Search in Google Scholar
[Sokołowicz Z., Krawczyk J. (2007). Behaviour of conservation breed hens kept with or without access to open-air runs. Ann. Anim. Sci., Suppl., 1: 153-156.]Search in Google Scholar
[Sokołowicz Z., Krawczyk J., Dykiel M. (2008). Hen housing system and egg quality as viewed by consumers. Ann. Anim. Sci., 8: 71-80.]Search in Google Scholar
[Świątkwicz S., Koreleski J. (2006). Effect of maize distillers dried grains with solubles and dietary enzyme supplementation on the performance of laying hens. J. Anim. Feed Sci., 15: 253-260.]Search in Google Scholar
[Świątkiewicz S., Koreleski J. (2008). The use of distillers dried grains with solubles (DDGS) in poultry nutrition. World’s Poultry Sci. J., 64: 257-265.]Search in Google Scholar
[Świątkiewicz S., Koreleski J., Arczewska- W łosek A. (2010). Egg performance, egg quality, and nutrient utilization in laying hens fed diets with different levels of rapeseed expeller cake. Agr. Food Sci., 19: 233-239.]Search in Google Scholar
[Tramontano W.A., Ganci D., Pennino M., Dierenfeld E.S. (1993). Distribution of α-tocopherol in early foliage samples in several forage crops. Phytochemistry, 34: 389-390.]Search in Google Scholar
[Tůmová E., Zita L., Hubený M., Sk řivan M., Ledvinka Z. (2007). The effect of oviposition time and genotype on egg quality characteristics in egg type hens. Czech. J. Anim. Sci., 52: 26-30.]Search in Google Scholar
[Zielińska B. (1965). Estimating the quantity and quality of food collected by hens on free range (in Polish). Rocz. Nauk. Rol., 86 B-4: 640-656. ]Search in Google Scholar
