Table 1 shows the effects of dietary
supplementation of fresh P. amaryllifolius Roxb.
on the productive performance of laying hens
raised in different types of housing system. The
livability and the average daily feed intake of
laying hens were not significantly affected,
whereas the egg production was significantly
improved (P< 0.01) by P. amaryllifolius Roxb.
supplementation. The chlorophyll and its
derivatives may have improved the metabolism
and enhanced nutrient utilization (Chanpreechapul
and Wattanakitrungrote, 2000). In addition, the
aromatic substances in P. amaryllifolius Roxb.,