Prelimenary Observations on The Effect of Some Growth Inhibitors on The Health and Growth of Tilapia Nilotica

Nigella sativa L is a herbaceous plant growing in countries borderingon the Mediterranean Sea. The essential oil ofNigella sativa L possessesvery strong antimicrobial effects and intake ofNigella sativa L enhanced theT -helper cell.The present study was designed to explore the possible effects ofNigella sativa L extracts on G-ve and G+ve microorganisms isolated fromchickens. In addition, the present work was conducted to throw a light onthe possible effects of the etherial extract ofNigella sativa L on the immuneresponse of chickens infected with Salmonella typhimurium.Two hundreds, one day old, Hubbard broiler chicks were divided intofour equal groups. The first group was left as a control. The second groupwas treated with the etherial extract ofNigella sativa L (100 mg/kg b.wt.)orally for 7 successive days to 4 days old chicks. The third group,experimentally infected orally with 1 mlIchick Salmonella typhimuriumNal,J (1xl07 cfu) to 2 days old chicks. The fourth group was infected withS. typhimurium Nal,J (lxl07 cfu) and treated with the etherial extract ofNigella sativa L (100 mg/kg b.wt.).