الفهرس 
Overview of phytaseOnly 14 pages are availabe for public view
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Abstract
This experiment was designed to the study of Phytase
Supplementation on egg production and egg shell quality of aged laying
hens.
The main results could be summarized as follows;
This study was carried out at the poultry breeding Farm, Poultry
Production Department, Faculty of Agriculture, Ain Shams
University. The study aimed to investigate the effect of different
levels of phytase on egg production and eggshell quality
measurements in laying hen of (Hy-lineW36 and Brown) layers
during the last period of production. Feed was offered ad lipitum
in metal feeders for each 2hen; water was supplied through
automatic nipples. The layers were directly fed a diet according to
the producer recommended manual guide of Hy-Line layers 2011
up to 52 week of age to 64 week of age as control treatment and
supplied 2 levels of phytase (300FTU-450FTU).
Results demonstrated highly significant difference between strains
for body weight, whereas the brown strain had significantly
heavier body weight compared to the white ones. The present
results indicated that no significant difference between strains for
egg number.
The main effects data indicated that the body weights at 52 week
of age weren’t significantly different on brown strain groups, and
at the other ages was significantly different in white strain groups,
but in all stages ph.2 with other experiment treatments weren’t
significantly different (P ˃0.05) compared control. Body weight at
60 and 64 weeks of ages in treatment showed higher body weight
of ph.2 group in tow strains more than other treatments, and
treatment of ph.1 in the same ages compared with control
treatment.
The brown layers significantly consumed more feed compared to
the white counterparts. Concerning Feed conversion ratio, the
present results showed that strain and layers age had highly
significant effect on Feed conversion ratio. W-36 layers strain had
better feed conversion ratio (1.84) compared to brown layers
strain (1.97). Feed conversion ratio increases with advancing of
layers age. Consequently, feed efficiency decreases
Supplementation of phytase in normal, corn-soybean meal diets
improved egg mass. Increase egg mass may be due the increase
egg production as egg number/hen, the result reported that, laying
hens fed a diet with phytase had significantly higher egg weight
than hens fed on the same diet without supplemental phytase
(control) showed that in white strain
There was no significant difference among treated group’s on egg
weight was not significant.
Results showed that Phytase supplementation by levels (300 FTU
kg-1 of feed) significantly improved all traits, while levels in
white strain (450 FTU kg-1 of feed) of phytase supplemented
laying hen diet