Empirical analysis of uric acid in Malpighian tubules and dry excrements and economic traits of the silkworm hybrids

Abstract

In the present study the amount of nitrogenous uric acid is found to be determined both in malpighian tubules and dry litter during fifth instar silkworm larvae. The PM X CSR2 multi-bi hybrid and FC2 X FC1 bivoltine double hybrid silkworm revealed positive response and consistent increase in the level of production of uric acid. The pattern of formation of uric acid in malpighian tubules of both the hybrids exhibits consistent level of increase in all the days of fifth instar; however, the quantum of uric acid is relatively more on the last two days of fifth instar silkworm larvae. The level of changes in uric acid content is comparatively higher than the Malpighian tubules in all the days of V instar silkworm of both the hybrids. The expression and manifestation of both the quantitative and qualitative traits of PM X CSR2 and FC2 X FC1 were recorded. The cocoon characters of FC2 X FC1 hybrid showed better in performance in the expression and manifestation compare to PM X CSR2 hybrid in cocoon weight, shell weight and shell ratio pre-monsoon. The filament length and filament weight are the qualitative parameters also reflected on par with the cocoon characters. The thickness of the filament is predetermined and reflected the quality of the silk. In FC2 X FC1 the denier is lesser than the PM X CSR2 which shows the denier is almost doubled. Finally, the quantum of cocoons required to produce one kg of raw silk is of almost 5.36kg whereas, the PM X CSR2 showed 8.28kg for the production of one kg of raw silk. In the present empirical analysis in relation to the uric acid content in dry excrement and malpighian tubules during fifth instar are carried out to understand the day to day changes in the chief nitrogenous waste product of the silkworm, Bombyx mori L.