ALTERATIONS IN NUTRITIONAL INDICES OF SILKWORM LARVAE, BOMBYX MORI (L) ON ADMINISTRATION OF THYROXINE HORMONES. RAMAKRISHNA, B. MANOHAR REDDY, S. RAJENDRA PRASAD AND M. BHASKARAbstract The silkworm, Botithyx mori (L) hybrid (I'M x \13.,D,) were fed on V variety of mulberry leaves treated with thyroxine hormone (1 mL of thyroxine solution sprayed on 5g. of mulberry leaves) in every day every feeding from the first day of III instar to end of the V instar. The effect of thyroxine on ingesta, consumption index, egesta, digesta and approximate digestibility was analysed in III instar, IV instar and V instar silkworm larvae on treated with thyroxine hormone. In III instar the ingesta was recorded significant reduction when compared to control. In contrast, the IV and V instar larvae exhibited significant elevation over control. The consumption index of the III and IV instar silkworm larvae showed non significant change with significant increase in V instar over control. The egesta was significantly elevated in III, IV instars and decreased in V instar larvae over control. The digesta exhibited significant reduction in III instar larvae, where as in IV and V instars the same was recorded significant increase on administration of thyroxine over control. The approximate digestibility showed non significant change in III instar with a significant increase in IV and V instar larvae over control. The above results envisages that the induction of thyroxine hormone induced significant alterations in digestion of food by silkworm larvae in different developmental stages leading to the assimilation of nutrients by increasing nutritional efficiency to improve the cocoon production.
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