The nutrient composition of leaves directly affects the growth and development of tasar silkworm larvae and the economic characteristics of cocoons. In the present study, the role of nutrients such organic (Farm yard manures + green manures + biofertilizer) and inorganic(NPK) on fecundity was studied. Studies have been launched to find out the effect of soil nutrient on fecundity and retention of eggs. The results suggested that larval weight was higher (male 42.52 g and female 47.07g) inorganic treatments when compared to other treatments. However, higher shell weight (2.4gm) was detected in male cocoons of larvae feeded with host plants grown on organic supplemented soil treatments when compared with other exposure group. Organic treatments fecundity was 146, inorganic treatments 129, and control 113. The application of organic manure increases larval weight and fecundity, which may increase tasar silkworm output and productivity.
Natural fibre silk consists of two proteins i.e. sericin and fibroin, which synthesized at the middle and posterior silk gland of silkworm, respectively. Sericin is glue proteins, which envelop the core protein fibroin and constitute about 15-25% of cocoon weight. It is hydrophilic in nature and composed of 18 different kinds of amino acids among these the serine, glycine, aspartic acid and threonine are most dominant one. Sericin possesses tremendous biological properties like antioxidant, antibacterial, anti-tyrosinase, UV resistance, anti-cancerous which open a wide scope for its application in various fields. Further, moisturizing ability of sericin serve as valuable ingredients for cosmetic industries for developing hydrating skin creams and protection against ultraviolet radiation as well as it also utilized as therapeutic agent for wound healing. In the present review the medicinal properties and its implication has been discussed.
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