الفهرس 
I.INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The art of silk production is called sericulture that comprises
cultivation of mulberry, silkworm rearing and post cocoon activities
leading to production of silk yield. Sericulture provides gainful
employment, economic development and improvement in the quality of
life to the people in rural area and therefore it plays an important role in
antipoverty program and prevents migration of rural people to urban area
in search of employment. Hence several developing countries all over the
world have taken up sericulture to provide employment to the people in
rural areas (Walaa Nageip, 2018).
The silkworm eats only mulberry leaves to make its cocoon,
producing the silk. Mulberry leaves are rich in protein and amino acids
(Machii, 1989). It is known that there is a high correlation between the
leaf protein level and production efficiency of the cocoon shell, which
means the cocoon shell weight of the total amount of mulberry leaves
consumed by the silkworm (Machii and Katagiri, 1991).
Sericulture means cultivation of silkworms which finally produces
silk. The word silk sounds luxury and class. Until today, no other fabric
can match it in luster and elegance. As long as human desire for silk
garments continues, the demand for sericulture activity remains. Silk is
the queen of textile and naturally produced animal fiber. Scientists have
tried alternative hosts for the rearing of mulberry silkworm and many of
them used mineral elements as food supplements. They found positive
impact of supplements on the silkworm growth and silk production
(Ahmed,1998).
The Egg hatching rhythmicity in silkworm, Bombyx moriwas
studied under natural day (LD 12:12), reverse light-dark cycles (DL
12:12), continuous light (LL) and dark (DD) conditions. A distinct diurnal hatching rhythm was observed under alternate light-dark cycles
(LD/DL). Under LL also, the rhythm was diurnal with a near dampingout
expression. Hatching was completed in a single day, occurring on the
9th day of oviposition under LD/DL cycles, and on the 10th day under
DD. Under LL, however, it occurred for two consecutive days, starting
with stray hatching on the 10th day and extending to the 11th day of
oviposition. Low light intensities resulted in less hatching durations while
high light intensities increased them (Reddy et al., 1998).
The present study was carried out during spring season of 2017 in
Sericulture Laboratory, Economic Entomology Department Faculty of
Agric., Menuofia University to evaluate the effect of light time and color
on some biological, technological and physiological characters of
silkworm, Bombyx mori L.