الفهرس 
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Abstract
The experimental work was carried out at El-Azab Poultry
Research Station, Fayoum, Animal Production Research Institute,
Agricultural Research Center, Ministry of Agriculture, Dokki,
Egypt during the period from February to April 2016.
A total number of 560 one-day old unsexed Cobb broiler
chickens were initially fed a basal control diet for six days, then
were divided into two experiments. The first experiment 200 chicks
were divided into five treatments; each treatment contained four
replicates of ten birds. The objectives were to determine the effects
of Spirulina to broiler diets on productive performance and some
physiological responses. While, the second experiment 360 chicks
were divided into nine treatments, each treatment contained four
replicates of ten birds. The objectives were to study the effects of
bacteria (B. subtilis or P. acidilactici) alone or combined
supplementation in broiler diets on productive performance, bacteria
enumeration and some physiological responses.
chicks were fed starter diet from 7 to 14-day, grower diet
from 15 to 21- day, finisher diet from 22 to the end of the
experiment at 38 days of age.
Results obtained could be summarized in the following:
5.1. The first experiment:
Live body weight (LBW, g) and body weight gain (BWG, g):
The analysis of data on mean LBW and LBWG reveals
significant differences at finisher period. Birds fed with 0.9 and
0.7g/kg of feed Spirulina platensis had significantly increased LBW
and LBWG compared to the control, while birds fed the basal diet
(control) had the lowest LBW and LBWG values.
Feed intake (FI) and feed conversion ratio (FCR):
The mean feed intake (g) showed significant differences on
broiler at the end period. The feed intake at final period was
decreased significantly in bird fed 0.7g/1kg of feed Spirulina
platensis when compared to control group and other treatments.
The mean FCR was significantly influenced by Spirulina platensis
at 38 and 7-38 days from age. At 38 days from age, chicks fed
experimental diet containing Spirulina platensis had best
significantly FCR compared with the control.
Crude protein conversion (CPC) and caloric conversion ratio
(CCR):
No significant difference was found among groups from at
14, 21and 30 on (CPC) and (CCR). Chicks fed experimental diets of
levels of Spirulina platensis (0.9, 0.7, 0.5 0.3g)/1kg diet had
significantly better CPC and CCR during the period from 31to
38days of age, while during the period from 7to 38days chicks fed
experimental diets of levels of Spirulina platensis (0.9,
0.7,0.5g)/1kg diet had significantly better CPC and CCR compared
the control group.
Growth rate (GR) and performance index (PI):
Concerning treatments effect, no significant difference
among groups in GR between the chicks treated with Spirulina
platensis and control groups except the period from 7-38 days.
Chicks fed experimental diets at levels of (0.9 g Spirulina
platensis)/ kg diet had significantly higher GR during period from
7-38 days compared with the control group. Chicks fed
experimental diets of Spirulina platensis at levels of (0.9, 0.7, 0.5
g)/ kg diet had significantly improving PI during periods from 22-
30, 31-38 and 7-38 days compared with the control group.
Slaughter parameters%:
The results indicated no significant differences due to
supplementation of Spirulina platensis on slaughter parameters
(Liver%, Gizzard%, and Heart%) except, abdominal fat%, half
breast% and half rear% which were significantly affected. Chicks
fed the control diet were significantly higher abdominal fat%, half
breast% and half rear% than the other treated groups.
Immune organs:
The results indicated significant differences were noticed in
bursa%, thymus% and spleen% as affected by the treated groups in
comparison with the control. Birds fed diets supplemented with 0.9
g Spirulina platensis diet, had the highest value of bursa, thymus,
and spleen compared with the control diet.
Blood parameters:
The results of blood hematology indicated no significant
differences due to supplementation of Spirulina platensis, except,
white blood cells (WBCs), heterophils, lymphocyte and H/L ratio
which were significantly affected. Concerning the treatment effect
on blood serum, the results indicated significant differences were noticed in Globulin, ALT, AST, Triglycerides and Total Cholesterol
as affected by the treated groups in comparison with the control.