الفهرس 
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Abstract
Introduction :- Probiotics are dietary supplements of live microorganisms thought to be healthy for the host organism, probiotics are ”live micro organisms which when administered in adequate amount confer a health benefit on the host” Aim of The Work : Is to throw some lights on the effects of probiotics supplementation as a growth promoter, antioxidant and lipid lowering substances,therefore we measured total lipids, triascylglycerol, cholesterol, LDL-cholesterol, HDL-cholesterol, total protein, albumin, globulin, MDA(in serum), catalase, superoxide dismutase, reduced glutathione and glutathione -S- transferase(in RBCs), MDA and GSH(in tissues) in broiler chickens. Material and Methods: Two hundered and fifty mixed sexes, one day old Hubbard broiler chicken The experimental chickens were classified into five groups each group consists of fifty chickens as follows: (G1) was a control group and chickens were fed on a ration free from prebiotics, probiotics or antibiotics. (G2): chickens in this group were fed an experimental ration containing prebiotics (lactose 5%). (G3): chickens in this group were fed an experimental ration containing probiotics 1%. (G4): chickens in this group were fed an experimental ration containing prebiotics 5 % and probiotics 1%. (G5): chickens in this group were fed an experimental ration containing antibiotics (chloramphenicol 1%). Chickens were fed on the experimental ration for six weeks, at the end of the experiment the body weight was recorded and the chickens were sacrificed for collection of blood samples for biochemical analysis in blood and serum. Results :Probitics increase bodyweight, proteins, albumin, globulin and HDL cholesterol but decrease total lipids, TG, cholesterol, LDL cholesterol and increase of SOD, GST and Catalase and GSH level. Conclusions : probiotics used to improve body weight and some biochemical parameters