Question
Discuss the appropriate time and methods for harvesting cocoons and identify any five types of defective cocoons with brief descriptions.
Answer :
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Harvesting of cocoons is an important stage in silkworm rearing because it directly influences the quality and quantity of silk produced. Cocoons should be harvested at the correct time to ensure that the silk filament remains intact and suitable for reeling. Normally, cocoons are harvested about 5 to 7 days after the silkworms complete spinning. At this stage the pupa inside the cocoon is fully formed but the moth has not yet emerged. If harvesting is delayed and the moth emerges, it breaks the cocoon filament, making it unsuitable for reeling. Therefore, timely harvesting is essential to maintain the continuous silk filament. Before harvesting, the mountages or cocoon frames are examined to ensure that spinning has been completed. When the cocoons become firm and the outer floss becomes dry, it indicates that they are ready for harvest. Harvesting is generally done by hand by carefully removing the cocoons from the mountages. Workers gently pick the cocoons and avoid pressing or damaging them. The harvested cocoons are then cleaned by removing loose
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