الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
A total of 270 unsexed one – day old (Arbor – Acres) broiler chicks were used to study
the effect of supplementation of different levels of Nigella sativa, Natuzyme and their mixture on
growth performance, carcass characteristics, blood plasma constituents, nutrients digestibility and
economical efficiency of broiler chicks under local environmental conditions. Chicks were weighed
and randomly distributed and divided equally into 9 dietary treatment groups nearly similar in
average body weight (38 g). Each group was represented by birds in 3 replicates of 10 chicks each
and kept under similar management conditions. Powder Nigella sativa and /or Natuzyme were
added in the basal diet (starter and finisher) as follows: treatment 1: basal diet (control, without any
supplementation), treatments from 2 to 9 were (basal diet + 2% Nigella sativa L),( basal diet + 4%
Nigella sativa L.), (basal diet + 0.03% Natuzyme), (basal diet + 0.05% Natuzyme), (basal diet + 2%
Nigella sativa L. +0.03% Natuzyme), (basal diet + 2% Nigella sativa L. + 0.05% Natuzyme), ( basal
diet + 4% Nigella sativa L. + 0.03% Natuzyme) and ( basal diet + 4%, Nigella sativa L. + 0.05%
Natuzyme), respectively and were fed to their respective groups of broiler chicks. Feed conversion,
performance index, dressing and giblets percentages, digestibility coefficient of dry matter, organic
matter, crude protein, ether extract and crude fiber, ash retention and dietary nutritive values were
significantly (P ≤ 0.05) improved by mixed levels of powdered Nigella sativa and Natuzyme mixture
supplement. Nigella sativa or Natuzyme supplementation significantly (P ≤ 0.05) increased plasma
total protein, albumin, globulin and liver enzymes (ALT and AST); while, total cholesterol
concentration was significantly (P ≤ 0.05) decreased in blood plasma. Plasma calcium and
phosphorus concentrations were significantly (P ≤ 0.05) increased by adding dietary Nigella sativa
and Natuzyme mixture in broiler diets at 49 day of age compared to the control diet. Data indicated
the beneficial economical effect of adding dietary Nigella sativa and Natuzyme mixture in broiler
diets, especially at treatment 7 (control + 2% Nigella seeds + 0.05% Natuzyme) without any adverse
effects under our experimental conditions.