BIVOLTINE SILKWORM PDF

PubMed Central. Food consumption and utilization is influenced by various biotic and abiotic factors. Under different environmental, feeding, and nutritional conditions, and with ingestion of the same amount of mulberry leaves, the silkworm shows significant difference in its ability to digest, absorb, and convert food to body matter. Lepidoptera: Bombycidae were studied.

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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. Chatterjee, S. Gamo, T. Hirabayashi, T. Sansi-Kenkyu Acta Serocologia , Lie, Z. Symposium of Sericulture Science facing 21st century. Hangzhou, China, th October, pp.

Miura, M. Nakada, T. Abstracts of 17th Internatl. Seric,33 1 : Ravindra Singh, Vijayaraghavan, K. Mysore J. Ravindra Singh, Kalpana, G. Shibukawa, A. Rao, P. Yokoyama, T. User Username Password Remember me.

Article Tools Print this article. Indexing metadata. How to cite item. Finding References. Email this article Login required. Email the author Login required. On cocoon uniformity in different crosses of bivoltine hybrids of silkworm Bombyx mori L.

Veeranna Gowda, Kalpana G. 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.

Key words: Bivoltine hybrids, cocoon uniformity, single, three-way and four-way cross hybrids. Full Text: PDF. References Chatterjee, S. Datta, R. Central Silk Board, Bangalore. Central Silk Board, Bangaloe, pp. Remember me.

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Bivoltine silkworm egg prices double

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Question Answer 1 What are the care to be taken during incubation and chawki rearing Following care should be taken during incubation and chawki rearings :. Eggs should be free from pathogens. Number of eggs should be more than per dfl. There should not be unfertilized and dead eggs. After 48 hours of black boxing ie. Eggs should be transported during cooler hours of the day using egg carrying bag. In case of postponement of brushing,.

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Food consumption and utilization is influenced by various biotic and abiotic factors. Under different environmental, feeding, and nutritional conditions, and with ingestion of the same amount of mulberry leaves, the silkworm shows significant difference in its ability to digest, absorb, and convert food to body matter. Lepidoptera: Bombycidae were studied. The results indicated that food ingestion and assimilation were significantly higher among silkworm batches where optimum temperature and humidity were maintained compared with silkworm batches exposed to natural climatic conditions of the respective season. However, during summer the nutritional efficiency parameters were significantly higher among silkworms reared under natural temperature and humidity conditions when compared with the control.

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The hot climatic conditions of tropics prevailing particularly in summer are contributing to the poor performance of the bivoltine breeds and the most important aspect is that many quantitative characters such as viability and cocoon traits decline sharply when temperature is high. Therefore, the acceptance level of this hybrid with the farmers was not up to the expected level. However, though, these hybrids are tolerant to high temperature environments, they are not tolerant to many of the silkworm diseases. Keeping this in view, an attempt is made to develop silkworm hybrids tolerant to high temperature environments. Silkworm breeding aims to achieve superior performances in respect of egg yield, cocoon raw silk yield, cocoon stability, and production followed by expansion to new areas besides others.

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