Pullet replacement is one of the most expensive costs in
the commercial egg industry. The farmers prefer to keep
the hens for an additional laying cycle, when pullet
replacing is expensive (Bell, 2003). In older laying hens
preservation of ideal egg production is difficult and these
birds are more susceptible to some metabolic disorders
such as fatty liver (Squires and Wu, 1992).
Turmeric (Curcuma longa) is a perennial herb that
grows and cultivated extensively in the tropical regions of
Asia and Central America. The yellowish rhizome powder
of this plant is traditionally used as a spice and food
coloring agent. The main essential oils obtained from