Evaluation and Identification of Promising Bivoltine Double Hybrids of the Silkworm Bombyx mori L. for Tropics Through Large Scale In-House Testing
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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.
Abstract
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.
참고문헌 (13)
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