Conclusions
Our results suggested that TRP at level of 2 g kg-1 during 4 weeks experiment had beneficial effects on older laying hens, because it improved the FCR and may help to producers from economic aspects. Also, TRP as a plant origin coloring agent, had potential to improve the yolk color value of the eggs produced by older laying hens. Turmeric rhizome powder, with hypolipidemic and hypocholesterolemic properties, had strong effect for changing serum lipid profile and it bring the idea that TRP may affect on total cholesterol of eggs. Further studies must be carried out to test the protection effects of TRP on fatty liver syndrome, egg oxidation and the egg persistency.