The research was conducted to evaluate the antibacterial effect of various forms of thernleaf extracts (Moringa oleifera) on the growth of four selected gram-positive andrnnegative bacteria and to evaluate the bacterial cultivated value of the extract.Thernantibacterial activity of leaf extracts of Moringa oleifera Lam., was determined in vitro,rnusing disc diffusion and minimum inhibitory concentration (MIC) determined againstrnselected animal pathogenic bacteria. M. oleiferaleave extract has been found to possessrnantimicrobial properties. In this work, four extraction solvents were used, i.e. aqueousrnextraction, fresh leave juice, ethanol and methanol. The methanol extract method ofrnfresh and dried leaves displayed potential broad spectrum activity against all the testedrnorganisms whereas the fresh leave juice extract which didn’t have any inhibitory effectrnwere evaluated for its bacterial cultivated value and it was obtained that the power formrnof this extract was optimal environment for the growth of both gram positive and gramrnnegative selected bacteria.rnThe antimicrobial assay showed that the zones of inhibition produced using discrndiffusion method ranged 3mm to 22mm for the four extraction methods with the highestrnvalue of 22mm obtained with ethanol extraction. The zones of inhibition for freshrnethanol extract was 4 to 22 mm, methanol extract from fresh leaf was 8 to 20 mm, andrnhot and cold water extract of fresh and dried leaves was 8 to 9,8 to 10,3 to 4 and 3 to 5rnmm respectively. The MIC values were conducted for the different form of extractsrnagainst the tested bacterial pathogens and the highest concentration was recordedrn25mg/ml for S.auerus while it was 30 mg/ml for S.fecalis. The bacterial cultivated valuernof M.oleifera powder extract of fresh leaf juice was determined by cultivating the fourrntested pathogens on the culture medium which was prepared from the plant extract withrnthe proper concentration of agar powder in sterile distilled water and it was revealedrnthat all the pathogens were successfully grown on it. The consequences of thisrninvestigation suggest that the extracts and juice of M.oleifera Lam. can be used torndiscover antibacterial agent for developing new pharmaceuticals to control animalrnpathogenic bacteria responsible for severe illness.