Evaluation of economic traits of selected FC1XFC2 and FC4XFC3 double hybrids treated with different doses of cholesterol during IV and V instar silkworm Bombyx mori L

Abstract

The effect of different concentration of cholesterol treatment during 4 th instar and economic characters were better manifested in larval weight except larval duration and significant improvement in cocoon characters and egg characters were observed in FC1XFC2 hybrid. Similarly, FC4XFC3 hybrid has been subjected for the cholesterol treatment during 4 th instar showed an unchanged larval duration in control and treated silkworms and enhancement in larval weight, cocoon characters and filament characters were highly significant except denier and renditta at 0.01 M concentration showed a negative relationship with reference to cholesterol supplementation. The egg characters of FC4XFC3 hybrid responded relatively better in the performance of egg hatching and fecundity. The impact of supplementation of cholesterol during 5 th instar silkworm hybrid namely, FC1XFC2 contributed to the improvement of all the economic parameters comprising larval characters, cocoon characters, filament characters and egg characters except unchanged larval duration in control and untreated batches. On the other hand, FC4XFC3 hybrid were subjected for the application of different concentration of cholesterol treatment during 5 th instar and expression and manifestation of the larval characters and cocoon characters were responded significantly except larval duration and cocoon weight at 0.1 M concentration showed relatively low in the cocoon weight compare to control batches. The filament length and weight of FC4XFC3 hybrid showed a consistent increase in the improvement of the traits, whereas the denier and renditta were inversely related to control and negatively correlated but at 0.1M concentration showed positive trend with respect to Renditta as observed in the investigation. The egg characters namely, fecundity and egg hatching in relation to the cholesterol administration and its impact leads to the enhancement in the rate of traits of selected bivoltine.