الفهرس 
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Abstract
The study aimed to evaluate two newly introduced two probiotics, that widely used lately in Egyptian farms: Biosol (lipotropic factor containing probiotics) and/or Zemos. Their effects on growth performance, blood parameters, carcass traits, and some growth and immunity-related genes transcription in broiler chickens, were investigated to figure out the best regimen for their use in improving growth performance. 400 one-day-old Cobb broiler chicks were furnished by a commercial hatchery and randomly distributed into four equal groups of 100 birds each. group 1 was used as a control group. Each day, group 2 received 120 g/10,000 chick a daily intake of Probiotic 1(Biosol) in drinking water. group 3 supplemented a three day interval of probiotic 2 (Zemos) at a dose of 0.25mL/L of drinking water. group 4 received a combination of 2 probiotics (Biosol + Zemos), with the same weekly dose of each probiotic given alternately. All chickens were fed and hydrated ad libitum during the trial, and exposed to light for 24 hours. Chicks fed diets enriched with Biosol and (Biosol + Zemos) gained more weight and had lower feed conversion rates, according to our findings. Total protein levels increased while cholesterol and triglyceride levels decreased. We can sum that treating broilers with probiotics, particularly Biosol, can improve their growth performance as well as the biochemical features of their blood and transcript levels of the genes under study.