الفهرس 
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Abstract
This study included two experiments. The first experiment was carried out at the Poultry Farm, Animal and Poultry Production Department, Faculty of Agriculture, South Valley University, Qena, Egypt, from March 2004 to March 2005 and aimed to study the effect of feed restriction on productive performance of two strains of laying hens. The second experiment was conducted in the Poultry Farm, Animal Production Department, Faculty of Agriculture, Minia University, Minia, Egypt, from 7th of September to 12th of October 2007 and aimed to evaluate the effect of feed restriction on productive performance of broiler chicks. Data of analysis of variance in Tables 3 and 5 indicated that, feed restriction had insignificant effect on both egg number and cumulative egg number during all productive periods.
Averages of egg number and cumulative egg number during all productive periods are shown in Tables 4 and 6 respectively. Laying hens fasted about 4 hours/day produced numerically higher cumulative egg number during the first laying periods (from 1 to 7 laying period) than those fed ad libitum or those fasted 8 hours/day. However, laying hens fasted about 8 hours/day produced insignificantly higher cumulative egg number during laying periods from 8 to 13. The insignificant effect of feed restriction on both egg number and cumulative egg number, in spite of its negative effect on feed intake (Table 20), may be due to the higher efficiency of feed utilization with limiting eating time (Table 24).