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    • Keywords


      Bombyx mori ; hypervitaminosis; nicotinamide; silkworm; vitamin B3

    • Abstract


      A high-dose of vitamin B3 in silkworm diet interrupts larval feeding and normal growth. High mortality of larvae occurs during molting and they cannot complete this process normally. Also the larvae exhibit nicotinamide hypervitaminosis symptoms such as immobility, dyspepsia, darkening of the skin, inability to excrete normally, exerting brownish fluid from anus and swelling of rectal muscles. Maximum larval weights in 1, 2 and 3 g/l treatments were 2.9, 1.6 and 1.2 g respectively, while maximum larval weight in the control was 5.6 g. Larval stage compared to control had increased 18, 26 and 31 days respectively. The concentration increase of uric acid in haemolymph demonstrates the hyperuricemia, while other measured biochemical compounds show significant decrease; sodium and potassium did not change significantly.

    • Author Affiliations


      Kayvan Etebari1 Leila Matindoost1 2

      1. Department of Sericulture, Faculty of Natural Resources, University of Guilan, Somehe Sara, Iran
      2. Department of Entomology, Faculty of Agriculture, University of Guilan, Rasht, Iran
    • Dates

  • Journal of Biosciences | News

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      Posted on July 25, 2019

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