الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Growth promoter agents are u ed to enhance gro tho It act either
directly by increa ing f ed con tim] lion and stimulatiug feed fficiency or
indirectly by increasing wear and decreasing tear, also it act by incrcasin
irnmunit . Recently the broiler raising costs are ery high. Many breeder
t d 10 u e growth-promoting agents as feed additives to obtain marketing
weight in a ry hort time.
The selection of growth promoting acents must be based on safety
and probability t give economic returns. The most Widely used agents are
the antimicrobial agents, including antibi tics (BremlCnekmeiyel’, 1996/’,
In recent years, th e has been a flurry of interes ill the lise of other non
nutritive substances such as a idifers, probiotics, enzymes, herbal
products, beta a zoni Is, microflora enhancers and innnuno-modulators
(De vegowda, 1996/’. The use of antibi ic as growth promoting, agents
d pend On af ty concerns. Currently thor are zinc bacitraci 11
bamb rrnycins (flavomycin cholorotetracyclioe lincomycin
ytetracycline p nicillin tyl in tiamulin and virgiuiarnycin (Robert
atrd Swick, J 996/2. ntibiotics and other growth promoting
antimicrobials have been u eel uece sfully in feed with economic benefit
The e materials improve digestion of nutrients lind increase res! lance to
disease (RO,€I1, 1996l4
•
igella sativa as herbal growth promoting plant i us d to cure many
disease . Prophet Molw11lmet.l staled how Nigel/a sativa oil prevents and
in deed heals many illnes , all exec] t death its If (if we call call. death an
illness!l). It has been used ill many Middle ast rn countries as a natural.