The Relationship between Silkworm Spinneret Positions during Cocoon Construction and Movement of Cocoons in the Reeling Bath

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Author(s)

Abstract

We analysed the positions of four silkworms’ spinnerets over their cocoon construction in order to clarify the relationship between silkworm spinneret positions and the movement of cocoons in the reeling bath. From the distribution of the spinneret positions for four <i>Bombyx mori</i> silkworms with three different races, N140×C140, N124×C124 and Okusa×Kojiki, the difference in spinning behaviour between the races is considered to directly affect the unevenness of a cocoon shell in thickness. The results also suggest that peanut-shaped cocoons such as Okusa×Kojiki are thinner in the middle than ellipsoid-shaped cocoons such as those of N140×C140 and N124×C124. It further showed that the unevenness may be related to its shape. Estimated rotational angles of a cocoon in the reeling bath showed that its angle approximately followed a Gamma probability distribution. The probability of a cocoon rotating more than a specified angle was significantly smaller for one of the two Okusa × Kojiki silkworms than for the three other silkworms. The similar gentle movement in the reeling bath for the Okusa × Kojiki silkworm was also indicated by the analysis of sample spherical variance. In contrast, there was no difference between the two Okusa×Kojiki silkworms and the N140×C140 and N124×C124 silkworms, in the direction of the rotating cocoons.<br>

Journal

  • Journal of Insect Biotechnology and Sericology

    Journal of Insect Biotechnology and Sericology 73(3), 107-112, 2004-10-29

    The Japanese Society of Sericultural Science

References:  11

Codes

  • NII Article ID (NAID)
    10014191857
  • NII NACSIS-CAT ID (NCID)
    AA11558849
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    13468073
  • NDL Article ID
    7166890
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産)
  • NDL Call No.
    Z54-J696
  • Data Source
    CJP  NDL  J-STAGE 
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