Some egg quality traits are presented in Table 3. In
consistent with Radwan et al. (2008), our results showed
that different levels of TRP had no significant effect on
egg shell thickness and egg shell weight. Radwan et al.
(2008) reported that the higher levels of turmeric (5 and
10 g kg-1
) may improve the small environment of uterus
and consequently increase the shell weight and shell
thickness. In the present study specific gravity and egg
shell weight: egg weight was not affected by TRP levels.
Supplementation of TRP had no effect on yolk color fan
value after two weeks of experiment, but its effect was
remarkable after 4 weeks. Levels of 1 and 2 g kg-1 TRP
had higher (P<0.05) yolk color fan value compared with
the control group. The yellowish pigment of turmeric
(curcuminoids, curcumin and its related compounds) may
be responsible for slightly improving the yolk color.
Awang et al. (1992) who used curcumin for upgrading
skin color of broilers reported that this pigment was
deposited in the broiler skin.
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