This study was conducted at the domesticated flock for Arabi lambs– Erbil, from 4/6/2013 to 3/9/2013 to study bio effect of Nigella sativa on productive performance and some of biochemical parameters. 24 male of Arabi lambs were used in this study aged 5-6 months and an average of weight 23.48 kg. The lambs were distributed randomly into four groups. All groups were fed concentrate ration equal in energy and protein but differs in crushed Nigella Sativa percentages 0, 4, 8 and 12% for four rations respectively by 3% of body weight. The results were appeared a significantly increase in all study characteristics except in total and daily feed intake and albumin between control and the second treatment (4% Nigella Sativa), and between second and third treatment with control in ALT enzyme were appeared not significantly different too.