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KMID : 1041219960380020130
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Journal of Sericultural and Entomological Science
1996 Volume.38 No. 2 p.130 ~ p.137
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Influence of Thyroxine on the Economic Parameters of the Bivoltine Silkworm, Bombyx Mori L .
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Hugar I. I.
B. B. Kaliwal
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Abstract
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Effect of topical application with 5, 10 and 15 Hg/ml thyroxine on the pre-cocoon, cocoon, postcocoon and silk improvement were studied in bivoltine silkworm NB18 breed of B. mori L.Thyroxine was applied independently on alternate days to silkworm of IV and V instar larvae. The treatment of all different concentrations resulted in a significant increase in commercial characters like larval weight, silkland weight, cocooning percentage, female cocoon weight and its shell weight and male cocoon shell weight and its ratio, cocoon dimension, length of the filament and its weight and oviposition. However, there was no significant change in larval weight in 5 μg/ml treated group and larval duration was significantly decreased. But moth emergence percentage and hatching percentage did not show any significant change when compared with that of carrier control
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