Evaluation d' hybrides F1 polyvoltins x bivoltins du ver a soie du murier, Bombyx mori L. au cours de deux saisons differentes.
2001
Ravindra Singh | Rachna Goel | Raghavendra Rao D. | Rekha M. | Premalatha V. | Ahsan M.M. | Datta R.K.
A study was conducted during July-August and November-December, 1998 to evaluate the heterosis of Fl hybrids between multivoltine and bivoltine strains of the mulberry silkworm, Bombyx mori L. The degree of heterosis varied considerably for several quantitative characters of Fl hybrids in two seasons. During July-August, BL43 x NB4D2 exhibited significant positive heterosis over mid parent value for fecundity, yield/10,000 larvae by weight and cocoon weight whereas BL24 x NB4D2 exhibited significant hybrid vigour for yield/10,000 larvae both by number and weight and cocoon shell weight during November-December. Study on cocoon shape measurement revealed that cocoons were comparatively uniform during November-December as compared to July-August. Importance of this study in the production of uniform shaped cocoons with uniform filament size, Fl hybrids with high heterosic effects and quantitative characters have been discussed.
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