الفهرس 
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Abstract
The present study was carried out to evaluate the effect of adding two levels of enzymes (0 and 0.8 kg/ton diet) such as phytase (0.3 kg/ton) and glucanase (0.5 kg/ton) and replacing barley for corn in growing and laying diet with the levels of 0, 25 and 50% on growth performance and some physiological responses. A total number (288) of males and females Anshass layers chicks, five week old were used in this study (72 of males and 216 of females). Chicks were obtained from Azab Company in Fayoum. Chicks were randomly distributed into 6 groups. Each group contains 4 replicates of 12 males and 36 females, each. The experiment was lasted at 25 weeks of age. Three diets within each of the grower and finisher diets were formulated to have recommended levels of both crude protein and metabolizable energy. The first grower and finisher diets were formulated to meet the nutrients requirements of laying hens according to NRC (1994) and was served as a control treatment. The second and third grower and finisher diets were formulated to have replacing barley instead of ground corn by the levels of (25 and 50%) with or without adding enzyme.All diets were arranged in a factorial arrangement to be two levels of enzymes (0 and 300 gm/ton phytase and 500 gm cocktail enzyme/ton) were added into different dietary treatments which based on replacing barley instead of ground corn by the levels of (0, 25, 50%).Body weight of each replicate was recorded at 5, 7, 9, 11, 13, 15, 17 and 19 weeks of age. Body weight gains, feed intake and feed conversion were calculated during the period (5-7, 7-9, 9-11, 11-13, 13-15, 15-17 and 17-19 week of age). Egg number and egg weight were recorded daily per hen in each cage during the experimental productive period from 19 to 25 weeks of age. Egg mass was calculated .At the end of the productive period of the experiment (25th week of age), blood samples were collected from each experimental groups to study some blood parameters.