CATDOLL : CATDOLL: Silkworm growth timeline (Silkworm growth timeline image)

1. What are the four stages of a silkworm's life? How many days does a silkworm's life cycle last?

After the four stages of egg-larva-pupa-adult, its development is incomplete metamorphosis. How long does it take for silkworms to go through each stage: The growth and development of silkworms are related to temperature, humidity, food, etc., and the accelerator period is generally ten to eleven days. The larval stage is about twenty-five days (specifically, 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. The moth stage is three to five days. After the silkworm moth emerges, it no longer eats, and its wings will harden after about an hour. After the wings harden, it will mate. Each female moth will lay about 300 to 400 eggs. The purpose of silkworms emerging into moths is to mate and lay eggs.

2. What are the 8 growth stages of silkworms?

1. Incubation

The silkworms that have just hatched from eggs are called ant silkworms. They are covered with fine hairs, which will become less noticeable after about two days.

Silkworms live on mulberry leaves. After eating mulberry leaves continuously, their bodies turn white. After a period of time, they begin to shed their skin. 3. Silkworms do not eat or move when they sleep. On the surface, they are sleeping, but in fact, they are shedding their old skin and replacing it with a new one to continue growing. Silkworms shed their skin 4 times during the entire breeding process. Each time they shed their skin, they do not eat or move. At this time, try not to disturb them, and do not throw them away thinking they are sick. Each sleep period of silkworms lasts about one day. 3. Silkworms spin silk

4. After molting once, it is the second instar larva. Each molt is counted as one year older. It takes four molts in total to become the fifth instar larva before it starts spinning silk and making cocoons.

Generally, the silkworms start to spin cocoons around 25 days old. When the silkworms' backs are shiny, yellow and transparent, it means that they are about to spin silk and spin cocoons. At this time, a cross-space should be provided for the silkworms to spin cocoons. 6. It takes two days to form a complete cocoon, and the silkworms complete the last molting in the cocoon and become pupae. 7. Break out of the cocoon

After about ten days, the female moth emerges from its cocoon and becomes a silkworm moth. After emerging from its cocoon, the female moth emits a scent from its tail to attract the male moth to mate. After mating, the male dies. The female moth can lay about 500 eggs in one night and then slowly dies.

3. How do silkworms grow? How long does it take?

The growth of silkworms generally consists of an incubation period of 8-9 days, a larval period of about 25 days, a pupal period of 14 to 18 days, and a moth period of 3 to 5 days.

The growth process of silkworms:

1. Hatching of silkworm eggs: After an 8-9 day accelerator period, the silkworms hatch from the eggs. They are small and black when they first come out, and are commonly known as ant silkworms.

2. First instar: The color of first instar silkworms changes from black to dark brown. They feed on mulberry leaves for 3 to 4 days and do not eat much. They will shed their skin for the first time after entering the dormant period, which lasts for 8 to 12 hours.

3. Second instar: The silkworm grows noticeably bigger and becomes lighter in color. It feeds on mulberry leaves for about 3 days and sleeps for 8 to 12 hours.

4. Third instar: The color of the silkworm body changes to light brown, the appetite begins to increase, and it enters the dormant stage after about 4 days. Silkworms from 1 to 3 instars are generally called young silkworms, and enter the adult stage after 10 to 14 hours.

5. Fourth instar: The silkworms entering the adult silkworm stage develop very quickly and their food intake increases significantly. The fourth instar usually lasts for 5 days, with a long dormancy period, generally called the long dormancy period, which can last up to 30 to 40 hours.

6. Fifth instar: The silkworms eat the most leaves during the first 7 days, accounting for more than 75% of the total leaf intake. After the 7th day, the silkworms begin to shorten and become brighter, and are called mature silkworms. They stop eating and begin to spin silk and make cocoons.

Things to note when raising silkworms:

1. Clean and disinfect the room before raising silkworms. Clean and plug holes. When raising young silkworms, pay more attention to thorough disinfection and disease prevention. Wash your hands before picking and feeding leaves. Strictly control the standard temperature, humidity, mulberry leaf standards and feeding time.

2. The professional term for silkworm egg hatching is "inducing green", which refers to the technical process of protecting silkworm eggs under suitable temperature and humidity conditions to allow silkworm embryos to develop and hatch into young silkworms. The specific method is: in a disinfected silkworm room, spread the silkworm eggs flat on the silkworm plaque with the egg side facing up. The room temperature for the first 1-4 days is required to be 24 degrees, with a dry-wet difference of 2-2.5 degrees; the room temperature for the fifth 10 days is required to be 27 degrees, with a dry-wet difference of 1.5-2 degrees.

When the silkworm embryos develop to the later stage, a few silkworm eggs are found to have blue dots. Immediately cover the silkworm eggs with black cloth. After about 40 hours, that is, 4-5 o'clock before dawn on the third day, remove the black cloth, wrap the silkworm eggs with white paper, with the egg side facing up, turn on the light, and let the ants bite through the egg shells to hatch. The baby silkworms can be fed about 30-40 minutes after hatching.

3. Collecting ants The professional term "collecting ants" means collecting the hatched ants and moving them to the silkworm bed paper for feeding. In general, in urban families, silkworms can still spin silk and make cocoons without this step.

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. 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.

6. What stages does the silkworm’s life cycle go through?

The growth cycle of silkworms is about 40 days, and its development is related to temperature, humidity, food, etc. Generally, the accelerator period is 10-11 days, and the larval period is about 25 days. Specifically, the first instar period is 4-5 days; the second instar period is 3-4 days; the third instar period is 4 days; the fourth instar period is 6 days; the fifth instar period is 7-9 days; the pupa period is 14-18 days; and the moth period is 3-5 days.

1. Hatching of silkworm eggs: After an 8-9 day accelerator period, the silkworms hatch from the eggs. They are small and black when they first come out, and are commonly known as ant silkworms.

2. First instar: The color of first instar silkworms changes from black to dark brown. They feed on mulberry leaves for 3 to 4 days and do not eat much. They will shed their skin for the first time after entering the dormant period, which lasts for 8 to 12 hours.

3. Second instar: The silkworm grows noticeably bigger and becomes lighter in color. It feeds on mulberry leaves for about 3 days and sleeps for 8 to 12 hours.

4. Third instar: The color of the silkworm body changes to light brown, the appetite begins to increase, and it enters the dormant stage after about 4 days. Silkworms from 1 to 3 instars are generally called young silkworms, and enter the adult stage after 10 to 14 hours.

5. Fourth instar: The silkworms entering the adult silkworm stage develop very quickly and their food intake increases significantly. The fourth instar usually lasts for 5 days, with a long dormancy period, generally called the long dormancy period, which can last up to 30 to 40 hours.

6. Fifth instar: The silkworms eat the most leaves during the first 7 days, accounting for more than 75% of the total leaf intake. After the 7th day, the silkworms begin to shorten and become brighter, and are called mature silkworms. They stop eating and begin to spin silk and make cocoons.

7. How many stages does a silkworm go through in its life and how long does each stage last?

The silkworm is an insect that has made a huge contribution to our daily life. Its life is relatively short. It goes through four stages: silkworm eggs, larvae, pupae and silk moths. Generally, the life cycle of a silkworm is about fifty days.

The silkworm goes through four stages in its life cycle: eggs, larvae, pupae, and moths. The silkworm is the larvae of the silkworm's life cycle, and the moth is the adult of the silkworm. The moth dies after mating and reproduction. The silkworm goes through four stages in its life cycle: birth, growth, development, reproduction, and death. This is the life cycle of a silkworm.

1. Silkworm eggs

The silkworm is an insect that relies on eggs for reproduction. Under normal circumstances, the dormant period of silkworm eggs is 7 days after laying eggs, from summer, mid-autumn festival to late October. After the silkworm eggs enter winter, they are exposed to a certain degree of low temperature, and the silkworm eggs will gradually end the dormancy and become active eggs. If the activated silkworm eggs feel a certain temperature, the embryos will gradually develop and hatch. Therefore, the old silkworm eggs need to be refrigerated in winter.

2. Larvae

After the silkworm eggs hatch, they break out of their shells and become larvae. When they are just born, the silkworms are not yet formed and look like soft strands. After 5 to 8 days, the silkworms begin to grow bigger and bigger and finally develop into larvae.

3. Silkworm pupae

After about five days of silkworm cocooning, the whole body will be wrapped in silk and become a pupa. The pupa is divided into three parts: head, thorax and abdomen. Its head is very small, with compound eyes and antennae. When the silkworm just turns into a pupa, its body is light yellow and soft, and gradually it will turn yellow, and the pupa skin will become hard. Don't underestimate the silkworm pupa, its nutritional value is very high. Silkworm pupa is a pure green food with a very high protein content. It is said that the nutritional value of a silkworm pupa is equivalent to that of two eggs. Silkworm pupa can regulate the body's sugar and fat metabolism to a certain extent, and silkworm pupa oil can reduce blood lipids and cholesterol very well. This active product can effectively increase the level of white blood cells in the human body, thereby improving the body's immune function, and can effectively delay the aging process of human body functions.

4. Silkworm moth

The silkworm moth looks like a butterfly, with white scales all over its body, but because its two pairs of wings are small, it has lost the ability to fly. The female moth is large and crawls slowly; the male moth is small and crawls faster, and its wings flutter rapidly, looking for a mate. Generally, after mating for 3 to 4 hours, the female moth can lay fertilized eggs. The silkworm moth (adult) leaves offspring and dies soon after. The eggs laid by the silkworm moth → hatch → turn into pupae → turn into moths, completing the cycle of a new generation. This is the life cycle of the silkworm, which is about 50 days.