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Evaluation of bivoltine single and double cross hybrids of silkworm, Bombyx mori L. for grainage parameters

Published online by Cambridge University Press:  19 September 2011

K. C. Narayanaswamy ,
T. K. Narayanaswamy ,
M. C. Devaiah ,
B. L. Visweswara Gowda  and
R. Govindan
K. C. Narayanaswamy
Affiliation:
Department of Sericulture, University of Agricultural Sciences, G. K. V. K. Bangalore-560065, India
T. K. Narayanaswamy
Affiliation:
Department of Sericulture, University of Agricultural Sciences, G. K. V. K. Bangalore-560065, India
M. C. Devaiah
Affiliation:
Department of Sericulture, University of Agricultural Sciences, G. K. V. K. Bangalore-560065, India
B. L. Visweswara Gowda
Affiliation:
Department of Sericulture, University of Agricultural Sciences, G. K. V. K. Bangalore-560065, India
R. Govindan
Affiliation:
Department of Sericulture, University of Agricultural Sciences, G. K. V. K. Bangalore-560065, India
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Abstract

Grainage parameters, viz. pupal weight, rate of moth emergence, fecundity and hatching were studied among four bivoltine pure races and their five single and four double cross hybrids of silkworm Bombyx mori L. The significant increase in double cross hybrids over pure races was 11.72, 7.43, 19.45 and 12.26% for pupal weight, rate of moth emergence, fecundity and hatching, respectively. The fecundity in double cross hybrids improved significantly over single cross hybrids to the extent of 16.03% whereas pupal weight, rate of moth emergence and hatching increased to the extent of 4.38, 5.90 and 5.76%, respectively.

The extent of standard heterosis and heterobeltiosis was maximum in double cross hybrids and the heterosis was more pronounced for fecundity.

Résumé

Les facteurs déterminants à savoir le poids de la chrysalide, le taux d'apparition de papillons de nuit, la fécondité et l'éclosion ont été étudiés parmi quatre races pures bivoltines et leurs hybrides obtenus après cinq croisements simple et quatre double croisements des vers à soie Bombyx mori L.

L'accroissement significatif en hybrides à double croisement sur les races pures était de 11,72, 7,43, 19,45 et de 12,26% respectivement pour le poids de la chrysalide, le taux d'apparition de paillons de nuit, la fécondité s'est améliorée de façon significative chez des hybrides à double croisement sur les hybrides obtenu après un seul croisement atteignant un taux de 16,03% alors que le poids de la chrysalide, le taux d'apparition de papillons de nuit et l'éclosion s'est respectivement élevé au taux de 4,38, 5,90 et de 5.76%.

Le degré d'amélioration de la race et de l'hétérobeltiose atteignait le maximum chez les hybrides à double croisement et la race améliorée était très remarquable pour la fécondité. Facteurs déterminants au sein des hybrides des vers à soie.

Keywords

SilkwormBombyx morigrainage parametersheterosisheterobeltiosissingle cross hybrids and double cross hybrids
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 12 , Issue 4 , August 1991 , pp. 433 - 437
Copyright
Copyright © ICIPE 1991

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References

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