After the baby silkworm cocoons, the silkworm will gradually become a pupa in the cocoon, and the pupa will become a silkworm moth in about 20 days, and then it will bite out of the cocoon, and the silkworm moth will lay eggs, and the eggs will hatch out the baby silkworm, and so on. Silkworm pupae need not be cut.

Cocoon refers to the cocoon of silkworm. The capsule-shaped protective layer of silkworm chrysalis contains pupa. Cocoon layer can be used for reeling, and the cocoon layer and waste silk after reeling can be used as raw materials for silk cotton and silk spinning.

Extended data:

nutritive value

Silkworm pupa has extremely high nutritional value and is rich in protein (crude protein accounts for 565,438+0%), fatty acids (crude fat accounts for 29%) and vitamins (including vitamin A, vitamin B2, vitamin D and ergosterol). The content of protein in silkworm chrysalis is above 50%, which is much higher than that in general food. protein contains various essential amino acids.

Protein of silkworm chrysalis consists of 18 amino acids, among which 8 amino acids essential for human body are very high. The content of these eight essential amino acids in silkworm chrysalis is about 2 times that of pork, 4 times that of eggs and 10 times that of milk, with balanced nutrition and appropriate proportion. It is a high-quality insect protein.

Baidu Encyclopedia-Silkworm Pupa