Entomology and
Applied Science Letters
Submission
Home About Contact Editorial Team Focus and Scope Submission Guidelines
Archive Current Issue
Creative Commons License 2014 Volume 1 Issue 3

On cocoon uniformity in different crosses of bivoltine hybrids of silkworm Bombyx mori L.

Veeranna Gowda, Kalpana G. V., Parthasarathy B. A., Somi Reddy J., Angadi B. S.
Abstract

The variability in cocoon shape is considered as an important parameter for evolving viable bivoltine silkworm hybrids of different crossing pattern and uniformity in cocoon shape helps in achieving improved reelability and uniform denier, the important post-cocoon quality parameters. In the present study, cocoon length, width, lengthwidth ratio, standard deviation and co-efficient of variation was assessed by utilizing the newly developed 21 each of different crosses of bivoltine hybrids (single, three- way and four- way crosses) along with control hybrids namely, (CSR2xCSR4) and [(CSR2xCSR27)x(CSR6xCSR26)]. The data revealed that wide variations in cocoon uniformity were observed among the different crosses of bivoltine hybrids. The study further revealed that the single-cross bivoltine hybrid, (CSR27xCSR26), three-way cross bivoltine hybrids, [(JPN8xCSR17)xD13] and [(D13xCSR26)xCSR17] and four-way cross hybrids [(JPN8xCSR17)x(D13xS9)] have recorded more cocoon uniformity.

Key words: Bivoltine hybrids, cocoon uniformity, single, three-way and four-way cross hybrids.

Share:
References

Chatterjee, S. N., Rao, P. R. M., Jayaswal, K. P., Singh, R. and Datta, R. K. (1993) Genetic variability in mulberry silkworm, Bombyx mori L. breeds with low silk yield. Ind. J. Seric., 32(1):69-86.

Datta, R. K. (1992) Guidelines for bivoltine silkworm rearing. Central Silk Board, Bangalore.

Gamo, T., Saito, S., Otsuka, Y., Hirobe, T. and Tazima, Y. (1985) Estimation of combining ability and genetic analysis by diallel crosses between regional races of the silkworm. (2) Shape and size of cocoons. Tech. Bull. Seric. Exp.Stn., 126:121-135.

Hirabayashi, T. (1982) Influence of difference of cocoon shape in pure strain to that of hybrids. Sansi-Kenkyu (Acta Serocologia), 121:27-36.

Lie, Z. (1996) Analysis on the inheritance stability of cocoon. Abstr. Symposium of Sericulture Science facing 21st century. Hangzhou, China, 6-10th October, pp.105.

Mano,Y. (1994) Comprehensive report on silkworm breeding. Central Silk Board, Bangaloe, pp.180.

Miura, M., Morikawa, H. and Sugiura, A. (1995) Statistical analysis of body movement and shape of Bombyx mori in spinning behaviour. J. Seric. Sci. Jpn., 64(3):237-245.

Nakada, T. (1989) On the measurement of cocoon shape by use of image processing method, with an application to the sex discrimination of silkworm, Bombyx mori L. Proc. Internatl. Congr. of SABRAO, pp.957-960.

Nakada, T., Maeda, H. and Murakami, M. (1991) Discriminate analysis related to sex-difference of cocoon shape in the silkworm, Bombyx mori L. Proc. of the Institute of statistical mathematics, 36(1): 23-40.

Nakada, T. (1993) Genetic differentiation of cocoon shape in the silkworm, Bombyx mori L. Abstracts of 17th Internatl. Congr. of Genetics, pp.224.

Nakada, T. (1994) On the cocoon shape measurement and its statistical analysis in the silkworm, Bombyx mori L. Ind. J. Seric,33(1): 100-102.

Ravindra Singh, Vijayaraghavan, K., Premalatha, V., Rao, P. R. M., Sengupta, K. and Kannantha, V. (1992) Hybrid vigour in F1, F2 and backcrosses in silkworm, Bombyx mori L. Mysore J. Agric. Sci., 26(1):76-81.

Ravindra Singh, Kalpana, G. V., Sudhakara Rao, P. and Ahsan, M. M. (1998) Studies on cocoon shapes in different crosses of mulberry silkworm, Bombyx mori L. Ind. J. Seric., 37(1):85-88.

Shibukawa, A., Eguchi, R., Shimajaki, A. and Ichiba, M. (1986) Studies on cocoon quality of the silkworm stock cultures of sericulture experiment station. Tech. Bull. Esric. Exp., 129:1-34.

Rao, P. R. M., Premalatha, V., Singh, R. and Vijayaraghavan, K.(1997) Variability studies in some pure races and F1 hybrids of the silkworm, Bombyx mori L. Environ. Ecol., 15(3): 683-687.

Yokoyama, T. (1951) Studies on cocoon formation of the silkworm, Bombyx mori. Bull. Seric. Exp. Stn. Jpn., 13: 183-260.

Entomology and Applied Science Letters is an international double-blind peer reviewed publication which publishes scientific research & review articles related to insects that contain information of interest to a wider audience, e.g. papers bearing on the theoretical, genetic, agricultural, medical and biodiversity issues. Emphasis is also placed on the selection of comprehensive, revisionary or integrated systematics studies of broader biological or zoogeographical relevance. In addition to full-length research articles and reviews, the journal publishes interpretive articles in a Forum section, Short Communications, and Letters to the Editor. The journal publishes reports on all phases of medical entomology and medical acarology, including the systematics and biology of insects, acarines, and other arthropods of public health and veterinary significance.

Announcement and Advertisement
Announcements regarding scientific activities such as conferences, symposium, are published for free. Advertisements can be either published or placed on website as banners.

Publisher
Institute of Pharmaceutical Sciences (IPS) , University of Veterinary and Animal Sciences, Lahore Pakistan.
open access
Entomology and Applied Science Letters supports the submission of entomological papers that contain information of interest to a wider reader groups e. g. papers bearing on taxonomy, phylogeny, biodiversity, ecology, systematic, agriculture, morphology. The selection of comprehensive, revisionary or integrated systematics studies of broader biological or zoogeographical relevance is also important. Distinguished entomologists drawn from different parts of the world serve as honorary members of the Editorial Board. The journal encompasses all the varied aspects of entomological research.