engleski

Increase of selenium content in table eggs

The aim of this research was to increase the selenium content in eggs, and to present how the different levels of selenium from feed affect the quality of fresh eggs. The experiment involved 90 layers divided into three experimental groups (A, B and C). Selenium content determined in the mixtures for laying hens was as follows: A=0.123 mg/kg, B=0.443 mg/kg and C=0.612 mg/kg. For analysis of selenium content in the edible part of egg 30 eggs was used (10 per group), while for the analysis of egg quality a total of 75 eggs were broken (25 pieces per group). Indicators of external and internal egg quality that were analyzed are: weight of eggs and main parts of eggs (g), shell firmness (kg/cm2) and thickness (mm), yolk color, pH value of yolks and albumen, albumen height (mm) and HU (Haugh units). The content of selenium in the edible part of egg increased in relation to its content in mixtures for laying hens. Statistically significantly higher (P<0.001) content of selenium in albumens and yolks of eggs was determined in the group C (albumen=0.209 mg/kg and yolk=0.863 mg/kg) compared to groups B (albumen=0.149 mg/kg and yolk=0.663 mg/kg) and A (albumen=0.053 mg/kg and yolk=0.387 mg/kg). Comparison of quality indicators results of tested eggs showed no statistically significant differences in weight of main parts of eggs, shell thickness, yolk color, pH values of albumen and yolk, albumen height and HU (P>0.05). A statistically significant difference (P=0.007) was found for egg weight. Laying hens of experimental groups C and A had heavier eggs in relation to the laying hens of group B (68.12 g and 67.72 g in relation to 65.96 g). In addition, statistically significantly firmer eggshell had eggs from group B in relation to group C (3.455 kg/cm2 and 2.941 kg/cm2 ; P=0.030). By analyzing the obtained results, it can be confirmed that the increase of selenium in feed for laying hens significantly affects the increase of mentioned microelement content in the edible part of eggs, and that addition of organic selenium to feed has no negative impact on quality indicators of eggs.

organic selenium ; table eggs ; quality

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