Wplyw organicznej i nieorganicznej formy selenu na sklad morfologiczny jaj i zawartosc selenu w masie jajecznej

The aim of the study was to determine the effect that organic and inorganic selenium-containing compounds had in feed mixtures for laying hens on the morphological quality of their eggs as well as the amount of selenium contained in the egg mass. The feed mixture for the laying hens was composed of maize and wheat meal and supplemented with ground soy and a mineral-vitamin additive. The feed contained 18.3% of crude protein and 10.7 MJ/kg of metabolical energy. Hens from group D1 received a mixture to which 0.3 ppm of an organic selenium compound was added and hens from group D2 were fed a mixture containing 0.5 ppm of the above mentioned element (Sel-Plex® of Alltech Company). The feed for laying hens in group D3 contained 0.3 ppm of inorganic selenium (sodium selenate). The results of the study indicate that both forms of selenium contributed to improving the quality of thick protein, which was expressed in H units. Adding selenium compounds to feed mixtures resulted in significant differences in the content of this microelement in the egg mass. The greatest quantity of selenium (565 ng/g) was contained in eggs from laying hens which received 0.5 ppm of organic selenium in their feed. Eggs from the remaining groups had a similar level of the above- -mentioned element.