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Rao, D.Raghavendra,Premalatha, V.,Singh, Ravindra,Kariappa, B.K.,Jayaswal, K.P. Korean Society of Sericultural Science 2002 International Journal of Industrial Entomology Vol.4 No.2
Breeding programme was initiated during November, 1995 with the main objective to breed productive multivoltine breeds/ hybrids with suitable genetic constitution to suit the fluctuating tropical climate prevailed in India. Two multivoltine breeds viz., BL-24 and BL-27 selected were as breeding resource materials from the silkworm germplasm maintained at Central Sericul-tural Research and Training Institute, Mysore. By adopting hybridization, backcrossing inbreeding and selection, a new multivoltine breed namely BL-67. This breed spins light greenish yellow cocoons and cocoon shape is oval with medium to coarse grains. The evolved breed was crossed with five tropical bivoltine breeds viz., NB4D2, CSR2, CSR5, CSR18 and CSR101 to study the combining ability, and identified a superior hybrid, BL67 ${\times}$ CSR101, named as CAUVERY, The hybrid is characterized by high pupation rate (>95%), high shell weight (> 35 cg), high cocoon shell ratio (> 20%), longer filament length (> 900 m) and high neatness (93) with a renditta of 6.5 producing 2A-3A grade silk. The hybrid is selected for Race Autho-rization test of Central Silk Board.
Gangopadhyay, Debnirmalya,Singh, Ravindra,Premalatha, V.,Rao, D.Raghavendra,Kariappa, B.K. Korean Society of Sericultural Science 2003 International Journal of Industrial Entomology Vol.7 No.2
To know the impact of female pupal weight corresponding to the male cocoon shell weight upon fecundity, hatchability and percentage of non-viable eggs, the experimental multivoltine breeds namely BL67 and 96A were categorised into low, medium and high batches according to the weight of female pupae and male cocoon shells and moths emerged from low, medium and high female pupae were allowed to mate withmoths emerged from low, medium and high male cocoon shells. Both the experimental breeds of BL67 and 96A revealed a fairl trend in fecundity for high batch > medium batch > low batch. When data were statistically analysed, a significant (p < 0.05) and a highly significant (p < 0.01) increase in fecundity was observed in the medium and high batches of BL67 during November - December, 2002 whereas highly significant (p < 0.01) increase was observed in the high batches of 96A during November - December, 2002. Data revealed a highly significant (p < 0.01) increase in fecundity in medium and high batches of both the breeds during January - February, 2003. More interestingly, a significant (p < 0.05) reduction was noted in percentage of non-viable eggs in high batches of 96A during January - February, 2003. But no significant variation in hatchability was noticed due to the effect of differential female pupal weight and male cocoon shell weight.
D. Raghavendra Rao,Ravindra Singh,V. Premalatha,V. N. Sudha,B. K. Kariappa,S. B. Dandin 한국잠사학회 2004 International Journal of Industrial Entomology Vol.8 No.1
The process of removal of gummy proteinous material sericin from silk is commonly called as degumming loss or boil-off loss ratio. In the present study, the boiloff loss ratio in the cocoon shells of twelve multivoltine × bivoltine hybrids and their parents were analysed. Inheritance pattern of boil-off loss ratio was analysed in crosses involving high and low boil-off loss parents, F1s, F2s and back-crosses by parent off spring regression analysis. Heterosis and heterobeltiosis was also analysed for this character. Highly significant (P > 0.01) variations were observed in eight out of ten multivoltine and two out of five bivoltine parents indicating the presence of genetic variation in the expression of boil-off loss ratio. Among F1 hybrids, ten hybrids expressed significant (P > 0.01) variations when compared with control hybrid PM × NB4D2. Significant negative heterosis was expressed in three multi × bi hybrids viz., BL67 × CSR101, 96A × CSR19 and 96C × CSR19, which is desirable for this character, whereas expression of heterobeltiosis was significant only with one hybrid, 96C × CSR18 in desired direction. Studies on inheritance pattern showed that the character is heritable and contribution percentage of female and male in the ratio of 50.9: 49.1 and it appears that both the parents are influencing in the expression of boil-off loss ratio in silkworm. Based on the overall performance and evaluation by multiple trait evaluation index and also considering the expression of the boiloff loss ratio three hybrids viz., BL67 × CSR101, 96A × CSR19 and 96C × CSR18 were found superior and recommended for commercial exploitation.
Singh, Ravindra,Rao, D.Raghavendra,Premalatha, V.,Mondal, Sipra,Kariappa, B.K.,Jayaswal, K.P.,Datta, R.K. Korean Society of Sericultural Science 2001 International Journal of Industrial Entomology Vol.2 No.2
Data from an experiment involving six polyvoltine and three bivoltine silkworm breeds have been analysed to know the level of hybrid rigour and cocoon shape variation in Fl hybrids among silkworm breeds with lows medium and high cocoon weight. Results indicated significantly positive heterosis for several quantitative characters with maximum total heterosis over mid parent value in hybrids between low and medium followed by low and low, medium and medium, low and high and high and low cocoon-weighed breeds, respectively. Study on cocoon shape measurement revelled that among Fl hybrids, cocoons of the three combinations such as GNP ${\times}$ CSR2, GNP ${\times}$ J2 and PM ${\times}$ NB4 D2 were comparatively uniform in their cocoon shape. Importance of this study to know the level of heterosis and cocoon shape variability in different silkworm crosses hale been discussed.