الفهرس 
Cover Page Title in EnglishOnly 14 pages are availabe for public view
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Abstract
The present study was carried out for seven seasons, from 1978 to 1984 at the Poultry Research Center of the Alexandria University, Faculty of Agriculture. The main objectives were: to measure the effects of individual selection in divergent directions for body weight at eight
-weeks of age, to determine the influence of divergent selection for eight—week body weight on age and weight at sexual maturity and 90 day egg ni.uuber and to provide estimates
of the heritability of eight—week body weight, age end weight at sexual maturity and 90 day egg nuxxther. The experimentalfiockused consisted of two selected \rs seon, The two lines initiated from
kiexandria chickens one of them is high line (IlL) was selected
for high eight—week body weight, while the other low line (LL) was selected for low eight—week body weight. Since then, selection continued for the following six seasons
in the 1978 season, each line was differentiated into different families. The selection was continued on the same basic till now. 2ince 1978, from 15 to 22 individual
breeding pens have been used to produce the chickens of high and low lines each year. Each pen had six to nine pullets mated with a single cockerl of the came line. A control line was ebtained in each of the two seasons
1983
and 1984, by random choice from all available birds of the two