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Development of a Polyvoltine Breed - $BL_{67}$ (Pg) of the Silkworm, Bombyx mori L. with Parthenogenetic Origin  

Singh, Ravindra (Central Sericultural Research and Training Institute)
Rao, D.Raghavendra (Central Sericultural Research and Training Institute)
Gangopadhyay, Debnirmalya (Central Sericultural Research and Training Institute)
Choudhary, Nazia (Central Sericultural Research and Training Institute)
Kariappa, B.K. (Central Sericultural Research and Training Institute)
Dandin, S.B. (Central Sericultural Research and Training Institute)
Publication Information
International Journal of Industrial Entomology and Biomaterials / v.9, no.1, 2004 , pp. 41-46 More about this Journal
Abstract
A breeding programme was initiated by utilizing a robust bivoltine breed CSR$_{18}$ and a polyvoltine breed Cambodge with the main objective of developing robust polyvoltine silkworm breeds/hybrids. At F$_1$ and F$_2$, parthenogenetic development was induced following warm water treatment of eggs at 46$^{\circ}C$ for 18 min followed by two backcrosses with Bl$_{67}$, an evolved polyvoltine breed. The newly developed breed was subjected for hybrid study using eight hybrid combinations in the laboratory at F$_{8}$ generation. F$_1$ hybrids between newly developed breed Bl$_{67}$ (Pg) and promising bivoltine breeds exhibited their superiority by expressing significant hybrid vigour for several economic characters like cocoon yield/10,000 larvae, cocoon weight, cocoon shell weight, cocoon shell ratio and denier. Study on cocoon shape variability revealed that cocoons of all the F$_1$ hybrids except BL$_{67}$ (Pg)${\times}$NB$_4$D$_2$ were found comparatively uniform in shape.pe.
Keywords
Bombyx mori L.; Breeding; Hybrid vigour; Cocoon shape variability; Parthenogenetic development;
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