الفهرس 
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Abstract
The objective of this study was to evaluate the effect of feed type and enzyme supplementation on growth performance of broiler chicks. A total number of 576 one day-old unsexed Cobb broiler chicks were grown over 35-d period. Chicks were wing-banded, weighed individually and randomly divided into sex equally major groups each contained sex replicates of 16 birds each. Chicks were similar, with respect to body weight and sex. The experimental design was factorial 3x2; three types of feed (pellet, crumble and mash) with two enzyme level (0 and 0.005%). Feed and water were offered ad libitum throughout the experimental period (0 to 5 weeks of age). Live body weight, feed intake and number of dead chicks were recorded. Daily weight gain, feed conversion rate and mortality rate were calculated.
Chicks fed pellet diets recorded significantly the highest final body weight, while those mash diet recorded significantly the lowest final body weight (2281.1 vs. 1842.7 g, P<0.001). Chicks fed pellet diets recorded significantly the highest carcass percentage, while no significant differences could be observed between those fed enzyme diets.
It could be concluded that feeding Cobb broilers on pellet diets improve growth performance, carcass parameters and economical efficiency. No significant effect could be observed due to enzyme supplementation.