Investigation of the effect of organic and inorganic selenium on the immune system, egg traits and blood parameters in laying hens

This experiment was conducted in a completely randomized design with 5 treatments, 6 repetitions and 10 chicken in each repetition in order to evaluate the effect of selenium supplement immune system related treats, egg qualitative characteristics, blood parameters and antibody titers against Newcastle disease and influenza, laying hens w36 strains. Experimental treatments include: (1) basic diet, (2) basic diet plus 0.5 mg/kg of Sodium selenite (3) basic diet plus 1 mg/kg of Sodium selenite, (4) basic diet plus 0.5 mg/kg of selenium-methionine and (5) base diets plus 1 mg/kg of selenium-methionine. The results show egg traits were not affected by experimental treatments (P>0.05). treatment of 0.5 and 1 mg/kg of selenium-methionine significantly reduced the enzyme Aspartate Amino Transferase (P<0.05). Also, treatments containing organic selenium significantly reduced the enzyme Alanine Amino Transferase (P<0.05). The results showed that 0.5 mg/kg of selenium-methionine significantly increased the levels of immunoglobulin G, M and A compared to other experimental treatments (P<0.05). However, the levels of immunoglobulins A and M in organic and inorganic sources were not significantly affected by selenium levels (P>0.05). Newcastle antibody titers did not significantly differentiate between experimental treatments (P>0.05). However, 1 mg/kg of selenium-sodium significantly reduced the antibody titer of influenza (P<0.05). In general, although the consumption of organic and inorganic sources of selenium was ineffective on egg characteristics, organic sources of selenium more effectively stimulate the immune system and increase blood immunoglobulins than non-organic sources.