Author(s): A.K.SAHA AND A.K. BAJPAI

Abstract: Quality and performance of insects is dependent on weight gain from feeding. The unchangeable biological parameter like larval critical weight (Lcw) is the basis for developing different criteria for insect quality. The Lcw has been described as a threshold weight above which normal process of pupation occurs. The Lcw in Nistari, Bombyx mori was 938.46 and 1118.15 mg for average sized male and female final instar larvae which were 49.60% and 53.13% of the larval maximum weight (Lmw) of males and females respectively. There was a consistent proportionate decrease in weight of about 0.66 % for males and 0.58% for females from larval maximum weight to the pupal weight of Nistari. There was also a consistent proportionate decrease in weight from the pupa to adult and thus, the total weight decrease from Lmw to adult was about 0.82 % and 0.72% for males and females respectively. A positive correlation was derived between female pupal weight and fecundity. A model representing the various fresh weight changes in relation to the Lmw has been suggested for the Nistari. The results of the study are largely consistent with those carried out on other species of Lepidoptera and using Lcw a new strategy for quality assessment of Bombyx mori has been described. Thus, quality assessment and its control is the key in regulating and sustaining the performance of an insect.

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