Analysis of the boil-off loss in parental and different crosses of bivoltine silkworm, Bombyx mori L.

Authors

  • Veeranna Gowda Central Sericultural Germplasm Resources Centre, Hosur - 635 109, Tamil Nadu, India
  • G. V. Kalpana P4 Basic Seed Farm, CSR&TI, Hassan, 573 217, Karnataka, India
  • K. Ashok Kumar Central Sericultural Germplasm Resources Centre, Hosur - 635 109, Tamil Nadu, India
  • S. Nivedita Central Sericultural Germplasm Resources Centre, Hosur - 635 109, Tamil Nadu, India
  • B. S. Angadi National Silkworm Seed Organization, Bangalore - 560 068, Karnataka, India

Abstract

The process of removal of gummy proteinous material (sericin) from the silk is commonly referred to as degumming loss or boil-off loss and is considered as one of the important economic traits during the course of silkworm breeding. Loss of sericin varies with breeds / hybrids, it is essential to analyze the ratio with reference to cocoon shell, as it is the basic raw material for the raw silk to estimate silk productivity of a breed / hybrid. In the present study, boil-off loss ratio in the cocoon shells of twelve bivoltine parental breeds (6 oval and 6 dumb-bell) and newly developed 21 each of different crosses (single, three-way and four-way crosses) of bivoltine hybrids along with control hybrids CSR2xCSR4 and [(CSR2xCSR27)x(CSR6xCSR26)] was analyzed to identify promising hybrids with desired boil-off loss ratio. Heterosis for boil-off loss ratio, shell ratio and raw silk percentage both in parents and all the hybrid crosses was also estimated and discussed. Among the parents, the least value of 21.50% was registered in JPN8 (oval), 22.01 % (S9) amongst dumb-bells and in the hybrids, single-cross hybrid CSR27xCSR26 (23.25%), three-way cross hybrid, (JPN8xCSR17)xCSR26 (22.51%) and four-way cross hybrid [(JPN8xCSR17)x(D13xCSR26)] (22.33%) was recorded. It was observed that some of the different crosses of the hybrids have also recorded desirable heterosis values for boil-off loss trait.

References

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How to Cite

Gowda, V., Kalpana, G. V., Kumar, K. A., Nivedita, S., & Angadi, B. S. (2015). Analysis of the boil-off loss in parental and different crosses of bivoltine silkworm, Bombyx mori L. ENTOMON, 38(3), 161–176. Retrieved from http://entomon.ambadi.org.in/index.php/Entomon/article/view/33

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