الفهرس 
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Abstract
This study was designed to study the effect of supplementation enzymes mixture into sorghum- soybean meal diets differed in crude protein content and metabolizable energy on growth performance, nutrients digestibility, carcass traits and some metabolic responses of broiler chicks. One hundred ninety two (192), one day old Hubbard broiler chicks were (3 diets × 2 levels of enzymes mixture × 4 replicates × 8 chicks). Three diets from each of the starter and grower diets based on sorghum- soybean meal were formulated to have recommended (D1), medium (D2) or low (D3) levels of both crude protein and metabolizable energy. LBW and FC were measured , BWG, FCR, PER, EER and livability % were calculated, at the end of experiment digestibility coefficient of nutrients was determined. At the end of the sixth week of age 3 bird were randomly taken from each treatment and to measure carcass traits. Samples of blood were to measure some blood constituents. The results revealed thatthe beneficial effect of enzymes on improving both LBW and BWG was more pronounced when it added to the growing diets deficient in energy and protein content. FC decreased with decreasing protein and energy levels. FCR, PER and EER improved with decreasing the level of both protein and energy in the diets. Digestibility of CP and CF increased with adding enzymes to (D2), enzymes supplementation had insignificant effect on livability of chicks. Addition of enzymes to (D2) or (D3) improved (p<0.05) total revenue, net revenue and the return/ unit feed cost. Broiler chicks fed (D2) plus enzymes cocktail recorded the highest (p<0.05) dressing%. Adding enzymes to (D2) recorded significant improving in blood glucose, While, (D1) with enzymes recorded significant increasing in GOT. Enzymes supplementation hadn’t significant effect on the other blood constituents.