Abstract
Alternative (non-conventional) poultry housing systems are introduced into production, on the one hand for the benefit of poultry welfare and, on the other hand because of the quality of eggs, i.e. the association/correlation between quality of life of hens and quality of product is established. Data obtained in the comparative analysis for proximate composition, fatty acid profile and cholesterol content of whole egg of genotype (Hy line and Naked N) housed in different systems (cage and free range) are presented in this study. Eggs from Naked Neck hens reared in free range system had statistically significantly higher content of dry matter, fat, protein and ash compared to genotype Hy line housed in both systems. Eggs obtained from genotype Hy line hens reared in free range system, in comparison to cage system, had higher content of dry matter, fat and ash, although the differences were not statistically significant, whereas the difference in the protein/albumen content in Hy line hens housed in cages compared to free range was statistically significant. Significantly lower content of n-6 fatty acids was established in eggs from Naked Neck hens (13.32) compared to eggs obtained from Hy-line hens housed on free range (17.46) and Hy-line hens housed in cage system (18.02). Content of toxic elements (Cd < 0.001 mg/kg; Pb < 0.05 mg/kg; As < 0.01 mg/kg; Hg < 0.005 mg/kg) in all three groups of eggs was in compliance with standards stipulated in the Article 9a, Annex 5, Rulebook on maximum residue limits for plant protective compounds in food and feed for which maximum reside limits are established.
Highlights
Quality of table eggs is a property of dynamic character and depends on numerous factors
Alternative poultry housing systems are introduced into production for the benefit of poultry welfare, on one hand, and on the other because of the quality of eggs, i.e. the association is established between the quality of life of hens and quality of product (Pavlovski et al, 2001; Appleby, 2001)
Data obtained in the comparative analysis for proximate composition, fatty acid profile and cholesterol content in the whole egg content in genotypes -Hy line and Naked Neck hens housed in different housing system are presented in this paper
Summary
Quality of table eggs is a property of dynamic character and depends on numerous factors. Alternative (non-conventional) poultry housing systems are introduced into production for the benefit of poultry welfare, on one hand, and on the other because of the quality of eggs, i.e. the association is established between the quality of life of hens and quality of product (Pavlovski et al, 2001; Appleby, 2001). Few authors in Serbia has investigated rearing of hen and egg quality in non-conventional housing systems (Pavlovski et al, 2002; Đukić-Stojčić et al, 2009; Perić et al 2007; Pavlovski et al, 2009; Pavlovski et al, 2010; Senčić et al, 2006). Even greater need for new alternative systems appeared following the adoption of the Rulebook on animal welfare in Serbia, in February 2010, banning the housing of layer hens in batter cages starting from 2012. Data obtained in the comparative analysis for proximate composition, fatty acid profile and cholesterol content in the whole egg content in genotypes -Hy line and Naked Neck hens housed in different housing system (cage and free range) are presented in this paper
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