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.
Similar content being viewed by others
References
Anonymous (1982) Annual Report, Central Sericultural Research and Training Institute, Mysore, pp. 72–76.
Benchamin K. V. and Krishnaswami S. (1981) Studies on the egg production efficiency in silkworm, Bombyx mori L. (ii) egg production efficiency in hybrid parents and its effective application. Proc. Serie. Symp. Semi. (1980), TNAU, Coimbatore. pp. 7–14.
Datta R. K. (1984) Improvement of silkworm races (Bombyx mori L.) in India. Sericologia 24, 393–415.
Jolly M. S. (1983) Lead paper: Silkworm Genetics and Breeding. Natl. Semi. Silk Res. Dev., C.S.B., Bangalore.
Krishnaswami S. (1978) New Technology of Silkworm Rearing Bulletin No. 2, Central Sericultural Research and Training Institute, Mysore.
Narasimhanna M. N. (1983) Silkworm seed technology. Natl. Semi. Silk Res. Dev., CS.B., Bangalore.
Narasimhanna M. N. (1985) Silkworm seed organization and seed technology for India during the seventh plan. Indian Silk 24, 22–26.
Pannengpet P. (1973) Survey on practical characters of three-way cross and double cross hybrids of bivoltine silkworm races. Bull. Thai Serie. Res. Train. Centre 3, 81–82.
Rai B. (1979) Heterosis Breeding. Agrobiological Publications, Delhi, India.
Sundararaj N., Nagaraju S., Venkataramu M. N. and Jagannath M. K. (1972) Design and Analysis of Field Experiments. UAS, Bangalore.
Tayade D. S. (1986) Heterosis effect on economic traits of new hybrids of silkworm, Bombyx mori L. under Marathwada conditions. Natl. Semi. Pros. Prob. Serie. India. Vellore, Tamil Nadu, Abst. 34.
Udupa S. M. (1986) Heterosis in relation to single, three way and double cross hybrids of silkworm, Bombyx mori L. M.Sc. (Agric.) Thesis, UAS, Bangalore, India.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Narayanaswamy, K.C., Narayanaswamy, T.K., Devaiah, M.C. et al. Evaluation of Rivoltine Single and Double Cross Hybrids of Silkworm, Bombyx Mori L. For Grainage Parameters. Int J Trop Insect Sci 12, 433–437 (1991). https://doi.org/10.1017/S1742758400011322
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1017/S1742758400011322