Research Highlight

Researchers:J.P. Abuan, M. E. Ulat, M. M. Viduya, M. L. Sanchez, & G.E. Supsup
Year Generated:2015

Sericulture is supported by the silkworm gene resource diversity, and its advancement is largely based on the silkworm variety improvement and breeding of new silkworm variety


With the increasing demand for quality raw silk and fabrics, Sericulture Research and Development Institute of the Don Mariano Marcos Memorial State University (DMMMSU-SRDI) has developed several bivoltine and multivoltine races laying primarily emphasis for productivity. However, the harsh tropical climate characterized primarily with sudden climatic fluctuations coupled with poor quality mulberry leaf and low management by the farmers warrants more flexible genotypes for which proper identification of initial parents is very much essential.


            Considering the crop sustainability and stability, development of productively and qualitatively superior silkworm breed is necessary.  This experiment is composed of four studies/activities viz; (1) Collection of silkworm germplasm breeding materials; (2) Extraction, isolation, purification and evolution of silkworm purelines; (3) Qualitative and quantitative evaluation of the evolved purelines; and (4) Evaluation and selection of breeding resource material of  bivoltine and multivoltine purelines in different seed crop seasons.


To identify potential resource breeding materials suitable for specific season for F1 hybrid preparation, the bivoltine purelines (DMMMSU 100, DMMMSU 101, DMMMSU 102, DMMMSU 103, DMMMSU 107, DMMMSU 115, DMMMSU 108, DMMMSU 109, DMMMSU 110, DMMMSU 111, DMMMSU 113, DMMMSU 119, and DMMMSU SLB) and multivoltine purelines (DMMMSU 1000, DMMMSU 1007, DMMMSU 1014, DMMMSU 1002, DMMMSU 1003, and DMMMSU 1016) were characterized and evaluated for four (4) economically important traits; Effective rearing rate (ERR), cocoon yield box-1

(CYB-1), single cocoon weight (SCW) and cocoon shell percentage (CSP) in different seed crop seasons as follows: March-April (dry season), July-August (rainy season), and October-November (cold dry season).


              This experiment was performed in Completely Randomized Design (CRD) replicated three times and data for each season were analyzed with Analysis of Variance (ANOVA) and further evaluation using multiple trait index method (EI).  




  1. 1.      Collected silkworm  germplasm materials
  • One (1) multivoltine x bivoltine and one (1) bivoltine x multivoltine F1 silkworm hybrids from other agency here in the Philippines


  1. 2.      Evolved multivoltine silkworm purelines utilizing mass and pedigree selection methods


  • DMMMSU 1002, DMMMSU 1003 and DMMMSU 1016





  1. 3.      Documented the qualitative characteristics of the newly-evolved multivoltine silkworm purelines (Appendix A)


Morphological and phenotypic traits of the evolved multivoltine purelines were meticulously documented/recorded (Appendix A)


  1. Evaluated and selected potential breeding materials for specific rearing season:


Newly-evolved Multivoltines


  • DMMMSU 1002 and DMMMSU 1003 for dry season
  • DMMMSU 1002 for rainy and cold dry seasons
  • DMMMSU 1003 and DMMMSU 1016 for cold dry season



  • DMMMSU 119 for dry season
  • DMMMSU 110 rainy season
  • DMMMSU 113 cold dry season
  • DMMMSU 113 for all seasons



  •  DMMMSU 1000 and DMMMSU 1007 for all seasons