CATDOLL : CATDOLL: There are several stages in silkworm breeding (pictures of several stages in silkworm breeding)

1. What are the five stages of silkworm growth?

Sericulture is generally divided into five processes, namely silkworm eggs, silkworm ants, mature silkworms, silk cocoons and silkworm moths.

The outer layer of the silkworm egg is a hard eggshell, and the inner layer is yolk and serosal membrane; the ant silkworm is hatched from the silkworm egg, with many fine hairs, very small, and looks a bit like an ant; the mature silkworm is the larvae that have developed to the last stage, gradually stop eating mulberry, and the silkworm body shrinks and becomes slightly transparent; the silkworm cocoon is the cocoon of the silkworm, the sac-shaped protective layer of the silkworm pupae; the silkworm moth is formed in the cocoon, shaped like a butterfly

2. How many steps are there in silkworm breeding?

There are five stages in silkworm rearing: silkworm eggs - larvae - mature silkworms - silk cocoons - silk moths, which takes a total of more than forty days.

Additional information

Sericulture is an important skill created by the working people in ancient China. It is said that the method of planting mulberry trees and raising silkworms originated from Leizu, the wife of Huangdi. The ancestor of the domestic silkworm is believed to be the wild silkworm (B. mandarina), which is almost the same as the domestic silkworm in appearance, and can naturally hybridize with the domestic silkworm to produce offspring after growing up.

Place the silkworms in a paper box or a small sieve for sifting rice. If using a sieve, place some paper at the bottom of the sieve.

When the silkworms have just hatched from the eggs, you need to be especially careful with them, feed them with relatively tender mulberry leaves, and use a very soft brush to move them when changing the mulberry leaves, and pay attention to the strength; sometimes the mulberry leaves are too dry, and if you are not careful, the silkworms will be left on the mulberry leaves that are about to be discarded. It is a little difficult to raise them when they are young, but it will be easier to handle when they grow up.

When it is about to make a cocoon, just take some wheat straw and tie it into the shape of branches.

After the moths break out of their cocoons, place them together in a box. They will mate together and lay eggs. Sometimes, because there are few silkworms, some moths will be left alone when they break out of their cocoons, but don't worry, as long as one pair of moths succeeds, I believe it will be enough for you to raise.

Mulberry leaves should be fresh. You can also collect them in a plastic bag each time, use a few leaves a day, and keep the rest in the refrigerator (4℃) to keep them fresh (do not water them, as the leaves will turn yellow quickly if you water them. It is recommended to seal them in a fresh-keeping bag). The collected leaves will have some dust, so you can wash them and dry them. You must dry them, otherwise the young or adult silkworms will have diarrhea after eating them, and they may even die.

3. How many stages are there in the life of a silkworm?

The silkworm goes through four different stages in its life: egg, larva, pupa and adult.

Silkworms hibernate as eggs and hatch into larvae when mulberry trees sprout in spring. The larvae feed on mulberry trees and grow, then go into hibernation and molt after 4 days and begin to spin cocoons after about 25 days.

After two days, the silk is spun and the silkworms shed their skins and pupate in the cocoon after another 2-3 days. After about 10 days, the pupae become adults, which are silkworm moths. Male and female moths mate and lay eggs, and then die. In order to meet the production requirements of raising silkworms multiple times a year, the silkworm seed farm adjusts the incubation period of silkworm eggs through various technical measures such as staggered seed production seasons, cold storage of silkworm seeds, and hydrochloric acid impregnation, so that silkworm seeds can be supplied in different seasons in spring, summer and autumn. When the silkworms are dormant, they do not eat or move. On the surface, they are sleeping, but in fact they are molting, that is, they are shedding their old skins and putting on new ones in order to continue to grow. The silkworms that have just shed their skins are called awake silkworms, which means they wake up after sleeping. The larval stage of silkworms is based on dormancy and is divided into five instars. The larvae that have just hatched from silkworm eggs are called first-instar silkworms. After eating mulberry leaves for about 3 days, they start to sleep for about 1 day. After waking up from the first sleep, they are second-instar silkworms. After about two and a half days of the second instar, they start to sleep for about 1 day. After the second sleep, they are third-instar silkworms. The third instar lasts about 3.5 days, and the silkworm begins to sleep for about 1 day. The fourth instar lasts about 4 days, and the silkworm begins to sleep for about two days. After the fourth sleep, the silkworm becomes the fifth instar. The fifth instar lasts about 6-8 days. Before the cocoon is formed, the silkworm stops eating mulberry leaves, and the body shrinks and becomes translucent, which is called mature silkworm. The silkworms from the first to the third instar are usually called young silkworms, and the silkworms from the fourth and fifth instars are called adult silkworms.

4. What is the sequence of changes during a silkworm’s life?

The life of a silkworm: eggs laid by silkworm moths → hatching → cocoons and pupae → moths, completing the cycle of a new generation. This is the life history of a silkworm.

Silkworm eggs: Silkworm eggs look smaller than sesame seeds, and are round and flat. A female moth can lay 400 to 500 eggs. Silkworm eggs are light yellow when they are first laid, and turn into light red bean or red bean color after 1 to 2 days, and then turn into gray-green or purple after 3 to 4 days, and then they will not change again. Hatching silkworms is a bit like hatching chicks. When we were young, we usually put silkworm eggs in the pockets of our clothes and use our body temperature to accelerate the hatching. We would take them out and have a look when we had nothing to do. Silkworm eggs are like chicken eggs, with a hard shell on the outside, and yolk and serosal membrane inside. The embryo in the fertilized egg continuously absorbs nutrients during the development process, and gradually develops into an ant silkworm, which breaks out of the egg shell.

Ant silkworm: When the silkworm emerges from the eggshell, it is very thin and looks a bit like an ant, so it is called an ant silkworm. The ant silkworm is about 2 mm long and 0.5 mm thick. It will eat mulberry leaves 2 to 3 hours after crawling out of the eggshell.

Silkworm sleep: Silkworms eat a lot of mulberry, and the faster they eat, the faster they grow. When their body color gradually fades and their appetite gradually decreases until they completely fast, they will spit out a small amount of silk, fix their abdominal feet on the silkworm seat, raise their head and chest, and stop moving, as if they are asleep. This is silkworm sleep. The sleeping silkworm may seem motionless on the outside, but it is preparing to shed its skin inside. After shedding the old skin, the silkworm's growth enters a new stage, and it sheds four times from ant silkworm to spinning silk cocoon. Having a dormant nature is one of the growth characteristics of silkworms.

Silkworm age: from the first molt to the first molt is the first age; after waking up from sleep, it enters the second age; after molting again, it enters the third age; after the third molt, it enters the fourth age, and the fourth molt is the long sleep. After the long sleep, it enters the fifth age. The fifth-age silkworms grow very fast. The longest silkworm we raised this time reached 8 cm.

Mature silkworms: When silkworms reach the end of the fifth instar, they gradually show the characteristics of maturity: first, the feces they excrete clearly change from dark green to leaf green; their appetite decreases, and the amount of mulberry food they eat drops significantly; their chest becomes transparent; their bodies turn a little yellow, and then they stop eating completely. Their bodies shorten, and their abdomens tend to be transparent. Their head and chest are raised, they spit out silk threads from their mouths, and they swing left and right and up and down to find a place to build their cocoons. These silkworms are called mature silkworms.

Cocooning: After the silkworms are mature, they are placed in a special container or on a cocooning device, and the silkworms will spin silk and spin cocoons. (The cocooning device is the place for making cocoons. Some branches or chopsticks can be used to make a #-shaped or trident frame.) The process of silkworm cocooning is roughly as follows: the mature silkworms find a good place to make cocoons, first spin out silk, and stick it on the cocooning device to form a cocooning frame, that is, a cocooning net. Continue to spin out messy silk circles to thicken the inner layer of the cocoon net, and then spin silk in an 8-shaped manner, and the outline of the cocoon begins to appear, forming a cocoon coat. After the cocoon coat is formed, the cocoon cavity gradually becomes smaller, and the silk continues to be spun to thicken, which begins the process of forming a cocoon layer. When the silkworm's body is greatly reduced due to spinning a large amount of silk, a loose and soft cocoon silk layer is finally formed, which is called the pupa lining.

Silkworm pupa: About 4 days after the silkworm makes a cocoon, it will turn into a pupa. After about 12 to 15 days, when the pupa body begins to soften again and the pupa skin is a little wrinkled and earthy brown, it will turn into a moth.

Silkworm moth: The silkworm moth that emerges from the cocoon loses its ability to fly because of its two pairs of small wings. The female moth is large and crawls slowly. The male moth is small and crawls faster, with its wings vibrating rapidly, looking for a mate. Generally, after mating for half a day, the female moth can lay fertilized eggs. After mating, the male dies, and the female moth can lay about 500 eggs in one night, and then slowly dies.

5. What stages does a silkworm go through in its life? What are the characteristics of its development?

The life of a silkworm can be divided into four stages: egg, larva, pupa and adult. There are five instars in the larval stage. There are dormancy periods and differences in mulberry-eating habits between each instar. Therefore, if we break it down, the life of a silkworm can be divided into eight stages.

6. What are the four stages in a silkworm’s life?

The life of a silkworm goes through four stages: egg, larva, pupa and adult.

Silkworm (scientific name: Bombyx mori) is an insect of the order Lepidoptera. It is the main source of silk and plays an important role in human economic life and cultural history. It is native to China and is commonly known as silkworm or nymph in southern China and Taiwan.

The silkworm is called "silkworm" in English because it uses silk to make cocoons. A cocoon is made from a strand of silk that is 300-900 meters long. Today, my country's silk production and exports account for more than 70% of the world's total, and it has become a major silk country that can dominate the world's silk price trend.

Living habits:

Silkworms are metamorphosis insects, the most common of which is the mulberry silkworm, also known as the domestic silkworm, one of the economic insects that feeds on mulberry leaves and spins silk cocoons. The silkworm originated in China, and its development temperature is 7-40℃, and the optimal temperature for breeding is 20-30℃.

Silkworms feed on mulberry leaves. After eating mulberry leaves continuously, their bodies turn white. After a period of time, they begin to shed their skins. They shed their skins for about a day, and do not eat or move, like sleeping. This is called "hibernation". After molting once, they become second-instar larvae. Each time they shed their skin, they grow one year older. The larvae shed their skins four times in total, becoming fifth-instar larvae. After eating mulberry leaves for another eight days, they become mature silkworms and begin to spin silk and make cocoons.

7. Introduction to the four stages of a silkworm’s life?

The life cycle of a silkworm consists of four stages: egg, larva, pupa and adult.

Silkworm eggs:

Silkworms reproduce by laying eggs. Silkworm eggs look like fine sesame seeds, about 1 mm wide and 0.5 mm thick. A female moth can lay 400 to 500 silkworm eggs. 1700 to 2000 silkworm eggs weigh about 1 gram and have a diameter of 0.2 cm. The color of silkworm eggs is light yellow or yellow when they are first laid, and changes to light red bean color or red bean color after 1 to 2 days, and then turns to gray-green or purple after 3 to 4 days. It no longer changes and is called a fixed color.

The outer layer of the silkworm egg is a hard eggshell, and inside is yolk and serous membrane. The embryo in the fertilized egg continuously absorbs nutrients during the development process and gradually develops into a silkworm. It crawls out of the eggshell, and the eggshell becomes white or light yellow after it is empty.

The first instar is four to five days; the second instar is three to four days; the third instar is four days; the fourth instar is six days; the fifth instar is seven to nine days; the pupal stage is fourteen to eighteen days; and the moth stage is three to five days.

larva:

When the silkworm hatches from the egg, its body is brown or black, very small, and covered with fine hairs, and it looks a bit like an ant, so it is called ant silkworm. The ant silkworm is about 2 mm long and 0.5 mm wide. After it crawls out of the egg shell, it will eat mulberry leaves after 2 to 3 hours.

silkworm chrysalis:

After the silkworms spin cocoons on the cocoon nest, they will turn into pupae after about 4 days. The body shape of the silkworm pupa is like a spindle, with three body sections: head, thorax and abdomen. The head is very small, with compound eyes and antennae; the thorax has thoracic legs and wings; the bulging abdomen has 9 body segments. Professional workers can distinguish the sex of silkworms from the lines and brown dots on the abdomen of the silkworm pupa. When the silkworms first pupate, their body color is light yellow and the pupa body is tender and soft. Gradually, it will turn into yellow, yellow-brown or brown, and the pupa skin will also harden. After about 12 to 15 days, when the pupa body begins to soften again and the pupa skin is a little wrinkled and earthy brown, it will turn into a moth.

8. What are the summary stages of silkworm rearing?

1. Stages of silkworm development

This small animal generally goes through four different stages in its life. These four stages are eggs, which are silkworm eggs, larvae, silkworm pupae, and finally adults, which are what we call silk moths.

2. Growth from larva to pupa

The life of a silkworm is about 50 days, which can be said to be relatively short. However, in these 50 days, the silkworm undergoes great changes every day. The growth process from larvae to pupae is the main part and the most changing. The silkworm needs to go through constant sleep and molting from larvae to mature pupae. First, when the larvae hatch from the eggs, they need to eat leaves for three days, then stop eating and sleep, and when they wake up again, they will molt and become second-instar silkworms. Then, according to this method, the second-instar silkworms will eat leaves for a few days and then molt and sleep again, and then become third-instar silkworms. The third-instar silkworms also need to take in a lot of food, and eventually become fourth-instar silkworms. When the fifth-instar silkworms mature, their bodies will become translucent, and at this time they will spin silk and become silkworm pupae.

9. What are the four stages in a silkworm’s life?

Silkworm egg, larva, cocoon, and adult

After the silkworm eggs hatch into larvae, they feed on mulberry leaves, and their daily task is to eat! When the larvae turn white, it is roughly time to make a cocoon. After the cocoon, it becomes a pupa, and at this time, it can be used to spin silk. Most of the silkworms' life mission ends here. A small number of silkworm pupae that are left as seeds will continue to develop, and finally break out of the cocoon to become butterflies and lay silkworm eggs, starting a new round of life reincarnation.