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Chanda, Subhra,Saha, Lal Mohan,Das, Nirvan Kumar,Kar, Niharendu Bikash,Bindroo, Bharat Bhusan Korean Society of Sericultural Science 2013 International Journal of Industrial Entomology Vol.26 No.2
Three new Multi ${\times}$ Bi combinations M.Con.4 ${\times}$ (SK6 ${\times}$ SK7), M.Con.4 ${\times}$ NB4D2 and Nistari ${\times}$ (SK6 ${\times}$ SK7) were studied in five seasons i.e. during the period of $18^{th}$ June - $12^{th}$ July, $30^{th}$ August - $23^{rd}$ September, $3^{rd}$ November - $2^{nd}$ December, $29^{th}$ January- $2^{nd}$ March and $30^{th}$ March-$25^{th}$ April with one control Nistari ${\times}$ NB4D2 considering nine reeling characteristics along with shell percent and cocoon yield per 100 disease free layings (DFLs) to establish the seasonal effect on all the parameters. Results reveal that all the characters performed well in November-December. Highest yield per 100 DFLs was recorded during November-December in all combinations showing >60 kg yield. Higher correlation of yield/100 DFLs with filament length, non-breakable filament length, denier, raw silk percent, reelability percent and recovery percent was recorded in all combinations of Multi ${\times}$ Bi considered in this study. Variability observed among four combinations indicates the effect of different temperature and humidity of different seasons on expression of different traits. The results indicate that there is significant relationship of raw silk percent with reelability percent, recovery percent and evenness. Reelability percent showed higher correlation with recovery percent. It was observed that neatness was positively correlated with evenness. The overall performance of the newly evolved combinations with regard to productivity and reeling characteristics is discussed emphasizing their utilization at commercial level.
Chanda, Subhra,Saha, Lal Mohan,Das, Nirvan Kumar,Kar, Niharendu Bikash,Bindroo, Bharat Bhusan Korean Society of Sericultural Science 2011 International Journal of Industrial Entomology Vol.23 No.2
Thirty five bivoltine breeds were acclimatized under controlled condition for three years during two seasons to evaluate their efficiency in Seri industry of tropical region. Out of thirty five ten breeds had been short listed based on ranking for individual trait. Three breeds out of those ten selected breeds viz. SK6, NB18 and B.Con.4 ranked top in respect of overall performance. The ten breeds based on average Evaluation Index value > 50 considering twelve economically important traits are the resource material for future course of breeding program in West Bengal.
( Subhra Chanda ),( Lal Mohan Saha ),( Nirvan Kumar Das ),( Niharendu Bikash Kar ),( Bharat Bhusan Bindroo ) 한국잠사학회 2011 International Journal of Industrial Entomology Vol.23 No.2
An attempt was made to assess the potentiality of bivoltine double hybrids under simulated conditions of farmers to identify the suitable bivoltine double hybrid combination. Four bivoltine double hybrids developed at Central Sericultural Research and Training Institute (CSRTI), Mysore along with popular single hybrid, CSR2 x CSR4 as control was assessed for economic traits. The rearing results showed significant improvement of 20-24% in fecundity of the double hybrids studied over single hybrid. Among the double hybrids, [D7 ×S5]×[D13×S1] recorded significantly higher survival (89.58 %), cocoon yield (76.328 kg/50,000 eggs), cocoon price (Rs. 180.87/kg) and lower cocoon leaf ratio of 1: 21.80. The performance of the reeling traits were also found significantly superior in [D7×S5]×[D13×S1] with higher filament length (1100 m), reelability (88%), raw silk (18.55%) and neatness (92 points) compared to CSR2 × CSR4 and other double hybrids evaluated. Besides, the cocoons of [D7×S5]×[D13×S1] exhibit uniformity in size with a standard deviation of < 8. Overall data indicated the superiority of [D7×S5] × [D13×S1] compared to the other hybrids evaluated and it has profound influence in expressing the full potentiality in the field.
( Subhra Chanda ),( Lal Mohan Saha ),( Nirvan Kumar Das ),( Niharendu Bikash Kar ),( Bharat Bhusan Bindroo ) 한국잠사학회 2011 International Journal of Industrial Entomology Vol.23 No.2
Thirty five bivoltine breeds were acclimatized under controlled condition for three years during two seasons to evaluate their efficiency in Seri industry of tropical region. Out of thirty five ten breeds had been short listed based on ranking for individual trait. Three breeds out of those ten selected breeds viz. SK6, NB18 and B.Con.4 ranked top in respect of overall performance. The ten breeds based on average Evaluation Index value > 50 considering twelve economically important traits are the resource material for future course of breeding program in West Bengal.
( Subhra Chanda ),( Lal Mohan Saha ),( Nirvan Kumar Das ),( Niharendu Bikash Kar ),( Bharat Bhusan Bindroo ) 한국잠사학회 2013 International Journal of Industrial Entomology Vol.26 No.2
Three new Multi x Bi combinations M.Con.4 x (SK6 x SK7), M.Con.4 x NB4D2 and Nistari x (SK6 x SK7) were studied in five seasons i.e. during the period of 18thJune -12th July, 30th August - 23rd September, 3rd November - 2nd December, 29th January- 2nd March and 30th March-25th April with one control Nistari x NB4D2 considering nine reeling characteristics along with shell percent and cocoon yield per 100 disease free layings (DFLs) to establish the seasonal effect on all the parameters. Results reveal that all the characters performed well in November-December. Highest yield per 100 DFLs was recorded during November-December in all combinations showing >60 kg yield. Higher correlation of yield/100 DFLs with filament length, non-breakable filament length, denier, raw silk percent, reelability percent and recovery percent was recorded in all combinations of Multi x Bi considered in this study. Variability observed among four combinations indicates the effect of different temperature and humidity of different seasons on expression of different traits. The results indicate that there is significant relationship of raw silk percent with reelability percent, recovery percent and evenness. Reelability percent showed higher correlation with recovery percent. It was observed that neatness was positively correlated with evenness. The overall performance of the newly evolved combinations with regard to productivity and reeling characteristics is discussed emphasizing their utilization at commercial level.