الفهرس 
المقدمةOnly 14 pages are availabe for public view
 |  | from | 130 |  |  |
| | | from | 130 | | |
Abstract
The present study was carried out at the Poultry Research Center of the Poultry Production
Department and Central Laboratory of Faculty of Agriculture (El-Shatby), Alexandria
University, during the period from May to June, 2017. The study was carried out to evaluate
the growth performance and physiological characteristics of broiler chickens feeding diets
with natural zeolite (Z) and phytase enzyme (Ph).
A total number of 594 one-day-old broiler chicks (Ross 308), were used in this study. At
the beginning of the experiment the broiler chicks, were individually weighted to the nearest
gram (41g), and randomly distributed into nine equal experimental groups, 66 birds in each
group. Experimental groups were arranged as 3 * 3 factorial design with three levels of Z (0.0,
1.0 and 2.0 %) and three levels of Ph (0.0, 0.05 and 0.075 %). The experimental period lasted
up to 5 weeks of age.
The main results of this study can be summarized as follows:
The result indicate that LBW didn’t differ between 1% and 2% natural zeolite (Z) in broiler
chicks diet at 7, 14 and 21 days of age, but it has significant differences (P≤ 0.001) at 28 and
35 days of age. The highest LBW was observed of the treatment 0.05 % Ph compared to
0.075 % Ph and the control group. For interaction between natural zeolite clinoptilolite and Ph
on LBW was statistically significant (P≤ 0.001) at 21, 28 and 35 days of age and the highest
LBW was observed in T8 (2% natural zeolite clinoptilolite and 0.05% diet Ph).
Regarding to live body weight gain (LBWG) the result showed that different levels of Z
has insignificant differences on LBWG at 7, 14 and 21 days of age. Within the level of Ph
(0.05%), there is significant difference on broiler LBWG at 14 and 21 days of ages. Over all
the whole experimental period (1-35 days) chicks fed 0.05% diet Ph level had significantly
greater LBWG than those fed 0.075% and control group. For interactions between varying
levels of natural Z and Ph showed that no significant effect existed on LBWG of broilers at 7,
14 and 35 days of age. However, the best value of LBWG was occurred for chicks fed (T8)
natural Z level (2%) and Ph level (0.05%) in their diet.
For feed consumption (FC) results showed significant difference during all studied
intervals, except it being insignificant during 1-7 and 21-28 days of age interval. Treated of
broiler chickens with natural zeolite clinoptilolite (2%) had significantly reduced FC than
those of the other supplemented groups and the control group at 7, 14 and the whole
experimental period (1- 35 days). For interactions between natural Z and Ph on FC result
showd that the birds treated T2, T4, T5, T7 and T9 for 7 days had significantly lower FC.
For FCR, data revealed that FCR was not significantly influenced by the natural Z at 7 and
35 days of age, and Broilers treated with Z2 (2%) had the better FCR than the control group at
7 to 14, 14 to 21 and 1 to 35 days of age. Meanwhile the data showed that treatment of the
broiler chicks with Ph (0.05%) during the whole period from 1 to 35 days of age caused a
significant improve (P≤0.001) effect in their FCR, when compared with the control group.
Regard to interaction the results indicated that at 7 to 14, 14 to 21, 21 to 28, 28 to 35 and 1 to
35 days of age, FCR was significantly improved as compared with control group and other
treatment groups.
Regarding to hematology parameters results revealed a non-significant increasing effect of
treatment with natural zeolite clinoptilolite on RBC, Hbl, PCV and MCHC during the
treatment period. The results indicated that the different levels of Ph insignificant differences
82
on MCV (Fl) and MCH (pg), the increase in values were in favor of the treatment of 0.075 %
Ph compared to the control group. Data showed a non-significant increasing effect for Ph on
birds at the end of the treatment period.