STUDIES ON FEEDING METHODS AND FREQUENCIES ON V-1 HYBRID MULBERRY
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Date
2002
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University of Agricultural Science, Dharwad
Abstract
"Victory-1, the newly evolved hybrid mulberry was evaluated for rearing
performance of the Mulberry silkworm, Bombyx inori (L) (NBjD2) by adopting different
feeding methods and frequencies at Department of Sericulture, College of Agriculture,
University of Agricultural Sciences, Dharwad, Karnataka, during 1999-2001. V-1
recorded significantly lower total larval duration, less pupal duration and lower disease
incidence as compared to S.v,. Larvae reared on V-1 consumed significantly more food
than S.v,. V-1 was superior to S36 with respect to weight of 30 worms just before settling
for third moult, maximum fifth instar ten larval weight, cocoon weight, shell weight, shell
percentage, pupal weight, moth emergence, fecundity, hatching percentage, single cocoon
bave length, silk filament weight, cocoon yield by number, cocoon yield/kg, denier,
renditta and ERR The cost benefit ratio was higher with V-1 than S c >36
Among the feeding methods shoot rearing effected significantly lower total larval
duration, lesser pupal duration and lower disease incidence as compared to shelf rearing
Shoot rearing method induced more feeding than shelf rearing. Shoot rearing recorded
significantly higher weight of 30 worms just before settling for third moult, maximum
fifth instar ten larval weight, cocoon characters, pupal weight, grainage parameters, silk
characters, ERR and cocoon yield. The cost benefit ratio was higher in shoot rearing
method than shelf rearing method.
Of the various feeding frequencies four feeds recorded significantly lower total
larval duration, lesser pupal duration and lower disease incidence than single feed per
day. Significantly higher leaf consumption was recorded in four feeds while one feed
recorded lesser leaf consumption: Four feed frequency effected significantly highest
weight of 30 worms just before settling for third moult, maximum fifth instar ten larval
weight, cocoon characters, pupal weight, grainage parameters, silk characters, ERR and
cocoon yield. However, based on the results of the present investigation irrespective of
the varieties used three feed frequency is equally economical to that of four feeds
particularly in areas of labour shortage."
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