Studies on Effects of Nutrient Supplements Fortified with Phagostimulants Formulation H1 on Growth and Development of Indoor Reared Antheraea assamensis Helfer (Lepidoptera: Saturniidae)

Abstract

A phagostimulant formulation H1 was fortified with different combinations of ascorbic acid, proline and Sodium Cyclamate to study their effect on growth and development of Muga silkworm under indoor rearing. All the chemicals fortified with formulation H1 had positive effect on body tissue growth of Muga silkworm, the best fortified combination being ascorbic acid-proline that gave highest average tissue growth of 2.8861 g against the average tissue growth of 2.55934 g in control. In larval survivability, the fortified nutrient combination ascorbic acid -proline and ascorbic acid -Na cyclamate had profound effect in all the instars. In respect of cocoon qualities, measured as cocoon weight, shell weight and silk ratio, all the nutrient combinations with phagostimulant formulation H1 were high in contrast to control. Leaf extract of Som plant has positive effect if used in the spray solution as substitute of blank water.

Rates of Feeding and Assimilation in the Silkworm Bombyx mori, as Influenced by Methoprene

“…As the larval period extended in the treated worms, the larvae consumed more food and this resulted in the increased body weight. This corroborates with the statement that remarked that a voraciously feeding larvae of B. mori should consume a higher quantity of food during an extended larval life (Paul et al, 1992). The digestive processes in insects are regulated by both secretogogue mechanisms and by hormonal influences (Woodring et al, 2007).…”

“…By affecting the release of PTTH which in the last instar silkworm is linked to the end of the obligatory feeding period, JH also influences the duration of indispensable feeding (Suzuki et al, 2013). Such modulatory effect of trace amounts of JH which are present in the last instar larvae, can be inferred from the observations that allatectomy at the start of the last instar reduces the length of the stadial period by two days and the body weight of larvae (Barman and Rajan, 2010).…”

Impact of photoperiod on circadian sucrose and sucrase rhythms in the digestive system of silkworm, Bombyx mori.

“…1B). Circadian sucrase rhythm Gut wall: The glandular epithelium of the midgut wall is the major source of sucrase which digests the dietary sucrose and this process is accompanied by the transfer of monosaccharide moieties from sucrose through a transglucosidation process necessary for the growth and development of silkworm larvae and this enzyme is synthesized and released in response to the stimulant action exerted by the concentration of sucrose in the gut lumen (Kanekatsu et al, 1993;Sumida and Ueda, 2007;Barman and Rajan, 2010). In B. mori, the larval gut wall maintained 7 SES cycles under both under LD and DD conditions with a duration of 3.4 hr each and 9 cycles under LL with a duration of 2.6 hr each ( Fig.…”