Sodium selenite, a quality Se-yeast and B-TRAXIMÒSe were compared, at two doses; 0.1ppm and 0.3 ppm, for their effects on performances and bioavailability. Egg production was affected by the level of selenium in the diet. The plasma Se content was not affected by the selenium level or source.

The selenium content in the liver, breast meat and egg was affected by interaction between the dietary selenium level and source. Organic sources increased the liver Se content, with no significant difference between Se-yeast and B-TRAXIMÒSe.

Se-yeast, rich in seleno-methionine, resulted in a higher Se content in the muscle (breast meat). The selenium content in the yolk was highest in hens fed B-TRAXIMÒSe, and the egg yolk is the source of nutrients for the progeny. There was no difference in combined Se contents of yolk and albumen for hens fed Se-yeast and B-TRAXIMÒSe. Glutathione peroxidase activity in the liver and plasma was affected by the selenium source but not by the level.

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