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Studies of some factors affecting the output of silk in Bombyx mori L

Published online by Cambridge University Press:  27 March 2009

I. A. Gaaboub ,
I. A. Rawash  and
S. M. Mostafa
I. A. Gaaboub
Affiliation:
Entomology Division, Plant Protection Department, Faculty of Agriculture, University of Alexandria, Egypt
I. A. Rawash
Affiliation:
Entomology Division, Plant Protection Department, Faculty of Agriculture, University of Alexandria, Egypt
S. M. Mostafa
Affiliation:
Entomology Division, Plant Protection Department, Faculty of Agriculture, University of Alexandria, Egypt
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Summary

The results obtained showed that there was a clear relationship between the ability of larvae to assimilate mulberry leaves and the resulting cocoons. The mulberry varieties, Morus alba var. rosa, M. rubra and M. alba var. Ihu, had a conspicuous effect on weights of the resulting cocoons in the three races of silkworm (Novi, Belgharia 4 and S.A. 105) studied.

Results obtained also indicated that the length of the silk fibre and the weight of silk cocoons that yielded 1 kg of silk were largest when the larval diet was M. alba var. rosa or M. rubra, and were smallest when the larval diet was M. alba var. Ihu.

Results also showed that the protein content determined in the resulting silk was proportional to the protein percentage in the different mulberry leaves.

Feeding of larvae of the races Novi, Belgharia 4 and S.A. 105 on M. alba var. rosa and M. rubra leaves caused approximately one- to twofold increase in the fresh weights of larvae or pupae. Weights of fresh cocoons and cocoon cortex constructed by pupating larvae were largest when larval diet was M. alba var. rosa or M. rubra and were smallest when the larval diet was M. alba var. Ihu.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 89 , Issue 1 , August 1977 , pp. 151 - 155
Copyright
Copyright © Cambridge University Press 1977

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