Three hundred-twenty Hisex Brown
laying hens, aged about 25-26 weeks, were used
in a 2 × 2 factorial completely randomized design
experiment. The effects of two levels of
supplementation of P. amaryllifolius Roxb. (0 and
5 g per hen per day) and two types of housing
system (evaporative cooling house and open
housing) on egg production and egg quality were
studied. The animals were divided into four groups
with eight replications. Each replicate consisted
of ten animals and randomly received one of the
following treatments