Turmeric powder supplementation up to 4 % in the ration of
old laying hen showed a significant effect to improve egg
production, but did not significant on egg weight (gr/egg)
(Table II). The improved egg production performance was
apparently maintained by turmeric supplementation along the
3 periods of experiment, while it was gradually decreased by
the control hen, without a significant alteration in egg weight,
as well as yolk index, egg shell index and Haugh unit
(unpublished data).It is an indication that the quality of egg
produced by old laying hen fed dietary turmeric powder was
maintained regardless of the percentages and periods of
supplementation.