چکیده:
The aim of this experiment was investigation on effects of delay and acceleration in round up and accumulation of matured silkworm larvae in order to transferring them to cocoon making frames. Three different ways of silkworm making cocoon-starting time was studied. The larvae hatching and rearing was conducted based on standard and similar methods. Ttreatments were (1) treatment 1: the completion time of larvae feeding and larvae transfer from rearing tray to cocoon frame was standard and performed individually based on larvae mature time; treatment 2: the completion time of larvae feeding and larvae transfer time from rearing tray to cocoon frame was 12 hours before larvae mature time; treatment 3: the completion time of larvae feeding and larvae transfer time from rearing tray to cocoon frame was 12 hours after larvae mature. Production traits recorded and analyzed using generalized linear models procedure based completely randomized design model. From obtained results, it is showed that among studied methods, the highest level of best cocoon number belonged to 2nd treatment (80.50), and 1st treatment (74.75) remained at lower level than other methods (P>0.05). Among studied methods, the highest level of best cocoon alive pupae number belonged to 3rd treatment (79.75), and 1st treatment (71.25) remained at lower level than other methods (P>0.05). Among studied methods, the highest level of best cocoon weight belonged to 3rd treatment (147.88 gr), and 2nd treatment (124.32 gr) remained at lower level than other methods (P>0.05). Among studied methods, the highest level of male Cocoon shell percentage belonged to 3rd treatment (24.11%), and 2nd treatment (23.44%) remained at lower level than other methods. Other methods were between these two groups (P>0.05). Among studied methods, the highest level of male cocoon weight belonged to 3rd treatment (1.66 gr), and 1st treatment (1.64 gr) remained at lower level than other methods (P>0.05). Among studied methods, the highest level of male cocoon shell weight belonged to some treatments (0.443 gr), and 2nd treatment (0.38 gr) remained at lower level than other methods. Other methods were between these two groups. Meanwhile statistical differences between studied methods for this trait were not significant (P>0.05).
خلاصه ماشینی:
From obtained results, it is showed that among studied methods, the highest level of best cocoon number belonged to 2nd treatment (80.
Keyword: mori, Delay, Spin, Cocoon Frame, Quality, Quantity * Corresponding author: Molaei Peer review under responsibility of UCT Journal of Research in Science, Engineering and Technology INTRODUCTION Silk is a kind natural yarn that is produced from silkworm cocoon.
Silkworm egg production stages, egg wash, disinfect, maintenance of silkworm eggs, microscopic tests in order to review and remove contaminated samples against Pebrin pathogen, first to fifth larval instars rearing, cocoon production framework and cocoon recording was conducted based on standard guidelines and protocols, especially ESCAP (1993).
Among studied methods, the highest level of best cocoon alive pupae number belonged to 3rd treatment (79.
Among studied methods, the highest level of best cocoon alive pupae number belonged to 3rd treatment (79.
In addition, the obtained findings show that activation of making DNA in endocrine cells in the mid-fifth larval age, is related to nutrition and hungry of silkworm larvae during the initial three days of this instar, inhibited DNA making (Chen and Gu, 2006).
Stage-dependent effects of starvation on the growth, metamorphosis, and ecdysteroidogenesis by the prothoracic glands during the last larval instar of the silkworm, Bombyx mori.
Analysis of ecdysteroidogenic activity of the prothoracic glands during the last larval instar of the silkworm, Bombyx mori.
Temporal analysis of ecdysteroidogenic activity of the prothoracic glands during the fourth larval instar of the silkworm, Bombyx mori.