When did silkworms start spinning? Why do silkworms spin silk?

Silkworms generally begin to spin silk and form cocoons when they grow for about 25 days. After the silkworm is hatched, it will undergo four times of peeling, each time it sheds, the silkworm will grow one instar, and when it grows to five years, the silkworm's body will become yellow and shiny, and then it will begin to spin silk. The time for silkworms to spin silk to make cocoons is 2-3 days, during which they will stop eating and need a quiet environment, if the silkworms are frightened during silking, they will stop spinning and even die.

About 15 days after the cocoon is completed, the silkworm will emerge as an adult and emerge from the cocoon.

When the mulberry tree germinates in spring, it hatches into larvae, and the larvae feed on mulberry and grow, and after 4 days of sleep, they molt and begin to form cocoons in 25 days. Two days later, the spinning was finished. The process of transforming a silkworm into a dish is only a short month, and its life is only one month.

The cocooning silkworm first spits out the silk, binds it to the cocoon, and then spins the silk to connect the surrounding branches to form a cocoon support, that is, a cocoon net. The cocoon net does not have a cocoon shape, but is just some soft and messy cocoon silk layer to serve as a support for the cocoon.

After the silkworm knots the cocoon net, continue to spit out messy silk circles, thicken the inner layer of the cocoon net, and then spin the silk in an S-shaped way, and the outline of the cocoon begins to appear, which is called the cocoon coat. The silk fibers of the cocoon are thin and brittle, and the arrangement is extremely irregular, after the cocoon is formed, the cocoon cavity gradually becomes smaller, and the front and back ends of the silkworm body are bent to the back.

Silkworms begin to spin silk and form cocoons when they grow in about 25 days, and after the silkworm is hatched, it will experience four times of peeling, and each time it peels and hurts, it will grow for one instar, and when it grows to 5 years, the body of the silkworm becomes yellow and shiny, and then it will begin to spin silk.

After the silkworm baby matures, it begins to spin silk, during this period the most mulberry leaves are consumed, and the food of the silkworm baby cannot be missing, and it will soon mature and spin silk.

The silkworm baby will become quiet, no longer eat mulberry leaves, the body will begin to become shiny, the stool is much larger than usual, the head keeps swinging, the muscles of the head are stretching back and forth with the swing, everyone should start to pay attention to it, the silkworm baby begins to find the appropriate position and begins to form a cocoon.

Silkworm spinning silk is for detoxification, from the physiological point of view of silkworms, because the protein that makes up the silk gland is composed of amino acids, if there are too many amino acids in the silkworm body, the silkworm body will be poisoned. Therefore, silkworms need to detoxify amino acids through silkworm spinning. In addition, the structure of natural silk is very similar to that of human skin, so there is a human body"Second**"The good name of the city.

Detoxify and protect yourself

Answer Analysis:After the silkworm baby eats a large number of mulberry leaves, the body absorbs and stores excess amino acids, if the excess amino acids are not eliminated, the larvae will be poisoned and die before pupation. Therefore, silking is a way of detoxification in order to make yourself live better.

Before silkworm spinning, it does not eat mulberry leaves and is very quiet.

Before the silkworm spins the silk, the body begins to become shiny and transparent, crawling everywhere, the stool is much larger than usual, the head keeps swinging, and the muscles of the head expand and contract back and forth with the swing. It takes about two days and two nights for silkworms to complete the cocoon, during which a quiet environment is required.

The reason why silkworms want to spin silk is because in the larval stage, they eat a large number of mulberry leaves. Mulberry leaves themselves contain various amino acids. Too many amino acids in the silkworm body will poison the silkworm. Therefore, silkworm spinning silk is a process of self-detoxification.

Answer: Silkworms will spin silk at the larval stage, and the first stage of silkworms is the feeding period, which is the first 4-5 days, and will mainly eat silkworm leaves. The second stage is the silkworm spinning period, which is about 5-6 days, and the silkworms at this stage will concentrate on silkworming.

When the silkworm becomes a pupae, it will not spin silk, and it will be in a state of pupae throughout the winter, and it will turn from a pupa into a butterfly when the temperature rises in the spring of the following year. <>

Silkworms start from hatching. Generally, it needs to grow to about 25 days to start a large number of silkworms, silkworms after a peeling, that is, the second instar larvae, after each peeling will increase one instar, a total of four times to shed the skin, become a fifth-instar insect before starting to spin silk cocoon.

It generally takes about 22-26 days for silkworms to spin silk from birth. From hatching to spinning silk cocooning, silkworms will experience a molt in 6-9 days, a total of about 22-30 days, and silkworms can be spun after the molting is completed. However, if in the process of silkworm raising, the satellite TV is insufficient or the growth temperature is too low, which will lead to a prolonged silking time, but generally not more than 30 days.

Precautions for sericulture:

Mulberry leaves should be fresh, you can also collect a plastic bag at a time, use several sheets a day in parts, and sprinkle the rest with some water in the refrigerator to keep them fresh. The picked leaves will have a certain amount of dust, which can be washed and dried, and must be cooled and dried, otherwise the silkworms will have diarrhea after eating. Do not use fly or mosquito repellent indoors.

Silkworms are sensitive to odors and can be poisoned to death.

Clean up the silkworm container in time, remove the residual leaves and silkworm sand, and remove the residual leaves when pulling off the silkworms with a brush, pay attention to whether there are still silkworms on the residual leaves. When the silkworm molts, the amount of mulberry leaves decreases, and it is about 1-2 days without eating. When the silkworm is molting, it does not need help to pull the skin, otherwise the silkworm will die of pain.

When the silkworm baby has molted its skin 4 times, and then continue to eat mulberry leaves, about 7 or 8 days, it will not eat the leaves very much, the body is shiny, and begin to look for a place to make a cocoon, at this time you can put something that can support it in the silkworm box, let it make a cocoon. Silkworm babies are afraid of cold, and the temperature is best kept at about 26. Silkworm babies also need high humidity, so you can put a small piece of wet paper towel in the corner of the box.

The life of the silkworm has to go through several metamorphoses, from an egg to grow into an ant silkworm, and then when it grows up, it is called a mature silkworm, and then a cocoon, and the final stage is an adult moth. In these transformations, it takes nearly 40 days for silkworms to grow. The silkworm grows from an egg, and when it first hatches from the egg, the silkworm is black and black, like an ant, so there are many people who call the silkworm at this time an ant silkworm.

When it first hatches, the animal is covered with fine hairs, and after about two days it is not very noticeable, and the silkworm breaks out of its shell and wants to eat after 40 minutes, at which point people have to feed.

Silkworms eat mulberry leaves, and after they continue to eat mulberry leaves, their bodies will turn white, and after a period of time they begin to peel, these silkworms generally spend a day to molt, how is their age calculated? Each time the animal molts its skin, it increases its age by one year, and when the silkworm has shed its skin five times, it begins to spin silk. They spit out for two days and two nights, and it takes two days and two nights for them to form cocoons.

Different kinds have different times. Silkworms can be roughly divided into three types: spring silkworms, summer silkworms, and autumn silkworms, autumn silkworms are about to spin silk in October, summer silkworms are around July, and spring silkworms are in April. When the silkworm first hatches from the egg, it is very small, called "ant silkworm", and after eating mulberry leaves for a few days, it suddenly grows up and begins to sleep.

After sleeping for a day or so, I took off the old skin and replaced it with a new one, and began to eat mulberry leaves again. Mulberry leaves contain water, protein, sugar, fat and other components. After the silkworm eats into the mulberry leaves, it absorbs the proteins and sugars in the mulberry leaves after digestion and decomposition, resulting in silk protein, which then forms silk liquid, and the silk liquid becomes a silk cocoon after silkworm spinning and coagulation.

According to the living habits of silkworms that eat and sleep, sleep and eat, people compare silkworms to babies who have not been born for a long time, and affectionately call them "silkworm babies". In fact, the sleep of the silkworm is not a passive rest, but a way for it to renew itself as it grows. The silkworm has to shed its skin four times in its life, and once it sheds its skin, it grows its body once, and each time it sheds its skin in sleep.

<>1. The mature silkworm first spits out the silk, sticks it to the chimner, and then spins the silk to connect the surrounding branches, that is, the cocoon net.

2. After the cocoon net is finished, spit out the messy silk loop, thicken the inner layer of the cocoon net, spin the silk in an S-shaped way, and the outline of the cocoon is the cocoon coat.

3. After the cocoon is formed, the cocoon cavity gradually becomes smaller, the front and rear ends of the silkworm body are bent to the back to form a C-shape, and the silkworm continues to spit out the cocoon silk, and the silking method changes from S-shaped to figure-eight, which is the cocoon layer.

4. When the silkworm spins a large amount of silk, and the body is greatly reduced, the ctophorax swing speed slows down, and there is no certain rhythm, the silkworm appears messy, forming a loose and soft cocoon silk layer, which is called a pupal lining. Finally, the head of the silkworm goes up and the tail goes down, and the last silk material left in the body is spit out, forming a soft cocoon top, and the process of spinning the silk camp cocoon ends.

Silkworms spin silk at the larval stage.

That is, in more than 20 days, it usually takes two days and two nights to spin silk and form cocoons, and when you spin silk, you will become quiet, and you will no longer eat mulberry leaves, your body will begin to shine, your head will keep swinging, and the muscles of your head will expand and contract back and forth, and then you will begin to look for a proper position to form a cocoon.

Silkworm spinning is generally in the larval stage, silkworm spinning must put something in the silkworm box that can be supported, this is the only lack of help silkworm cocoon, but also to provide it with a suitable environment.

Silkworms usually spit out the silk first, and then connect the silk to the surrounding area or mulberry leaves to form a cocoon support. At this time, it is necessary to pay attention to the stupidity of the stove mountain, and there must be no movement to disturb the silkworms, and the silkworms will stop forming cocoons if they are disturbed when spinning silk.

Precautions for sericulture:

Silkworm is a creature that is very afraid of cold, so we generally hear spring silkworms, and there is also a famous poem that only mentions spring silkworms, which is "spring silkworms to the end of the dead silk, wax torch into ashes and tears begin to dry." ”

Therefore, when raising silkworms, we should pay attention to the temperature of breeding, usually in April and May of each year is the best time to raise silkworms, the temperature at this time is basically about 20 to 25 degrees, we do not need to spend a lot of effort to adjust the temperature of the breeding room, so later through the adjustment of the temperature, there are also slowly other seasons of silkworm raising.

When raising silkworms, it is necessary to pay attention to the mulberry leaves should be fresh, at most, the mulberry leaves that have been placed at home overnight can also be used to feed the silkworms, but the mulberry leaves are not fresh for a long time, and the silkworms will have diarrhea or will not eat at all after processing.

The second thing to pay attention to is that the mulberry leaves must be cleaned, there can be no dust, and at the same time can not be given to the silkworm for the dew or after the cleaning is not dry mulberry leaves, because the silkworm will eat diarrhea and then die with it, and finally the mulberry leaves that have been sprayed in agriculture for a short time can not be picked back to feed the silkworms, and the silkworms are particularly sensitive to toxins.