Effect of different photoperiods and daily number of feeds on some biological and technological aspects of the mulberry silkworm, bombyx mori L.
2011
Helaly, W.MM. | Metwally, E.M. | Khalil, S.I.Y. | El-Shakaa, S.M.A.
Fifth instar mulberry silkworm larvae were exposed to 2 regimes of photoperiod, i.e., 15L:9D, 17L:7D compared with 13L:11D (control). Such larvae were offered 4,5 and 6 feeds/day in each photoperiod regime at spring rearing seasons of 2005 and 2006. The effects of such treatments on some biological and technological parameters were studied. The results showed that rearing silkworm larvae during 5th instar under 15L or 17L increased significantly the weight of mature larvae, silk gland, male pupa, fresh male cocoon, cocoon shell and size of silk filament (in denier) during the two investigated seasons. Increasing the number of feeds caused significant increase in the female pupal weight, weight of fresh female cocoon and size of reelable filament. Offering 6 feeds daily to 5th instar larvae under 17L:7D photoperiod regime resulted in a significant increase in majority studied characters, viz., weight of male pupa, weight of male cocoon, weight of male and female cortex and size of reelable filament.
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