الفهرس 
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Abstract
The present investigations were carried out at the Apiculture and Sericulture Laboratory, Plant Protection Department, Faculty of Agriculture, Zagazig University and the technological studies conducted at Sericulture Laboratory, Plant Protection Research Institute, Sharkia Branch during the period extended from 2005-2007. The studies on the bred Romanian hybrids and the imported Chinese one indicated that Chinese hybrid 9F7X possessed the highest mean weights of mature larva, silk gland and fresh cocoon shell, as well as the hatchability percentage . Meanwhile, the hybrid ♂B37 x ♀ AL gave the highest mean weights of pupa and fresh cocoon during 2006 and Regarding the effect of combined both photoperiod regime and the daily number of feeds data cleared that offering 6 feeds daily to fifth instar larva of B. mori under 17 L:7D photoperiod regime resulted in significant increase in the weight of male pupa, weight of male cocoon, weight of male and female cortex and size of reeled silk filament as a mean of the two years of study Concerning the effect of larval density (crowdness) on the biological and technological characters of B.mori such as weights of full- grown larva, silk gland, pupa, cocoon, female shell, moth and reeled silk filament , data revealed that the best results were obtained when fifth instar larvae reared under the lowest larval density (30 larvae/ 390 cm2) during 2005 and 2006 Female larvae of B. mori showed a superiority over male ones in silk gland parameters, weights of mature larvae, pupa and adult moth and the weight of the fresh coccons they spun during 2006 and 2007.