الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The present study was conducted at a private Farm, Shebin EL -
Kom, Minoufia Governorate, Egypt, in order to investigate the effect of
polyzyme (multi enzymes) in broiler diets with low protein levels on
growth performance, carcass traits, some blood components and
economic efficiency. A total of 180 Ross 308 unsexed one - day old
broiler chicks, were distributed at random into 3 groups each in 3
replicates, 20 chicks each.
Treatments were: T1: positive control, without Polyzyme, T2:
negative control, without Polyzyme and T3: negative control, with o.5
g Polyzyme*/ kg diet through the starter (1 - 21 d) and finisher (22 - 35
d) period.
The results indicated that:
1- Body weight, body weight gain and performance index
were improved significantly ( P ≤ 0.05) with addition of
polyzyme (0.5g/ kg diet).
2- Daily feed intake decreased significantly ( P ≤ 0.05) with
addition of polyzyme.
3- Feed conversion ratio, performance index and European
efficiency index were improved significantly ( P ≤ 0.05) with
supplementation of polyzyme. 55
4- Polyzyme addition significantly (P ≤ 0.05) increased Dressing,
liver and heart%, while Gizzard % was not affected.
5- Polyzyme supplementation to low protein diet led to decreased
serum total cholesterol and increased aspartic transaminase
(AST) enzyme compared to the positive control.
6- Total protein, creatinine, glucose and alanine transaminase
(ALT) enzyme were not affected by polyzyme
supplementation.
7- In general, The obtained results in the present investigation are
encouraging and indicated that supplementation of 0.5g polyzyme/ kg
diet can be used in broiler diets with low protein diets to get heaviest
weight, better feed conversion, performance index, European efficiency
index and economic efficiency under condition of this study.