Furthermore, an interaction between the
P. amaryllifolius Roxb. supplementation and the
type of housing system was found. Table 1 shows
that the livability and daily feed intake of laying
hens raised in housing with evaporative cooling
were significantly better than those of laying hens
raised under the open house system, even without
supplementation with P. amaryllifolius Roxb.. Egg
production followed the same trend. Nevertheless,
supplementation with 5 g per hen per day of fresh
P. amaryllifolius Roxb. in the diet reduced the
heat effect on the productive performance. The egg
production of laying hens kept in the open house
system was significantly improved (P< 0.0001),
when compared with that of those in the
non-supplemented group. It can be noted
that the beneficial medicinal ingredients in