الفهرس 
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Abstract
This experiment was designed to investigate the effect of feed density on broiler performance during summer in Upper Egypt.
Temperature was pleasured during the experimental period from June20 up to 1 sl of August 1999. The maximum daily temperature fluctuated between 33 and 39 0 C., while the minimum range was from 27 to 32 0 e.
The corresponding values for relative humidity determined during the period from July 11 up to1st of August were 64 to 78 % for the maximum and 49 to 56 % for the minimum.
Five starter and five finisher diets were formulated. The energy Jevels used ’were 2900,3000,3100,3200 and 3300 K cal.ME/Kg for each of the starter and finisher.the C/P ratio was maintained at 132 : 1 for starter diets while it was 150 : 1 for finisher diets.
The apparent metabolizable energy (AME) and nitrogen-corrected metabolizable energy (AMEn)were determined for all diets. Values of AME of the starter diets were 2952, 2984, 3090, 3232 and 32Z0 K cal. /
kg. Values of AMEn for the same diets were 2799, 2868, 2969, 3074 and 3122 K cal. / kg, respectively. The AME for the finisher diets were 2948, 2990,3110,3224 and 3301 Kcal./kg. The respective values for the AMEn were 2746, 2845, 3019, 3096 and 3154 K cal./ kg.the performance trial consisted of two experiments.