STUDIES ON REARING PERFORMANCE OF NEW BIVOLTINE BREEDS OF SILKWORM, Bombyx mod L. ON IMPROVED MULBERRY VARIETIES
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Date
2002
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University of Agricultural Science, Dharwad
Abstract
"The studies on the rearing performance of CSR-18 and CSR-19 breeds on
iroved mulberry varieties were conducted at Department of Sericulture, University
Agricultural Sciences, Dharwad during summer and pre-rainy season. In both
rearings CSR-18 and CSR-19 breeds performed better than NB^D^ in most of
economic traits. Among the breeds, the performance of CSR-19 was superior
:hawki larval weight, full grown larval weight, fifth instar larval duration, total
/al duration, silk productivity, cocoon weight, cocoon shell weight, cocoon
all ratio, number of cocoon per kg, cocoon yield per 10,000 worms, cocoon
ment length, pupal weight, pupal duration, moth emergence, flacherie incidence.
lereas, CSR-18 was superior in effective rate of rearing, per cent pupation,
pal duration, fecundity, by recording lower grasserie incidence. Whereas,
fifth instar larval duration was short in NB^D^ as compared to CSR-18 and
R-19.
Among the mulberry varieties, V-1 fed silkworms produced the highest chawki
val weight, silk productivity, effective rate of rearing, cocoon and shell weight,
coon shell ratio, least number of cocoon per kg, cocoon yield per 10,000 worms,
iment length, pupal weight, per cent pupation, pupal duration, moth emergence,
jundity, hatching percentage and least grasserie incidence. However, S-41 was
par with V-1 in chawki larval weight, silk productivity, effective rate of rearing,
coon weight, cocoon shell weight, cocoon shell ratio, number of cocoon per kg,
coon yield per 10,000 worms, filament length, pupal weight, per cent pupation,
oth emergence and hatching percentage. S-41 was superior to S-54 and M-5
alberry varieties. Superior denier was recorded in M-5 fed silkworms."
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