Just from the egg hatched out of the silkworm Po ants, we Po black like the so-called "ants silkworm", the body is full of fine hairs, about two days after the hairs that is not obvious.

Second, the baby silkworms grow up

The baby silkworms live on mulberry leaves, constantly eating mulberry leaves after the body turns white, after a period of time she will begin to shed their skin. It takes about a day to shed its skin, and then it sleeps without eating or moving, which is called "hibernation".

Three, the baby silkworm spits out silk

After a shedding of skin, it is a second instar larva. She sheds her skin once, counting an increase of one year, *** to shed her skin four times, becoming a five-year-old larva before she begins to spit silk cocoons.

Four, the silkworm baby section of the cocoon

Five-year-old larvae need two days and two nights to form a cocoon, and in the cocoon for the last time to shed their skin, become a pupa.

Five, baby silkworms break out of the cocoon

About ten days later, feathered into silkworm moths, breaking out of the cocoon. After coming out of the cocoon, the female moth's tail sends out a kind of odor to lure the male to cross the tail, and the male will die after crossing the tail, and the female moth will spend about one night to lay about 500 eggs, and then she will also die slowly.

Silkworms (larval stage) larval stage is the growth of silkworm feeding stage, production customary to hatch to the old mature time on the nest as the larval stage of the elapsed time. Larvae growth to a certain extent need to molt to the old skin, grow a broader new skin and then continue to feed growth, this process is called sleep. Common rearing of two four sleep silkworm varieties, the larval period need to molt into the fifth age, and then after 5-8d food mulberry in order to mature on the nest. The larval period needs to be less than a month, but the growth rate is extremely fast, the 5th age of extreme growth, the body length of 6 -7cm, 25 times more than the newly hatched ant silkworm, the body width of 0.8cm, 20 times more than the growth of ant silkworms, weighing 5 -7g than the growth of ant silkworms 10,000 times or so, the body of the weight of the silk gland than the growth of the ant silkworm 160,000 times, from the ant silkworms to ripe silkworms, the morphology of its unchanged, all for the long garden cylindrical shape, which can be divided into the head, thorax, abdomen, three body segments, thorax, abdomen, and the body of the silkworm, and the body of the silk glands. It can be divided into head, thorax and abdomen, with three segments in the thorax, each bearing a pair of thoracic peduncles; 10 abdominal segments, with a pair of abdominal peduncles on the ventral surface of each of the 3rd-6th abdominal segments and the 10th abdominal segment (the abdominal peduncle of the 10th abdominal segment is also called the caudal peduncle). Most of the body segments have an intersegmental membrane, which allows the silkworm to stretch. Antworms Just hatched from the eggs of the silkworm, the body is brown or russet, small, ant-like and so named. The body length is about 2.5mm, the body width is about 0.5mm, and the weight of 2000-2300 antworms is only 1g, which is customarily called the number of grams of ant head. After hatching, the ants can be collected for mulberry operation after 2-3h, and silkworm rearing can be started. If necessary, the silkworms can also be put into the 5 - 10 ℃ temperature in the cold storage 1-2d, too long will affect the subsequent growth and development. Silkworms are also known as baby silkworms. Hatching and collecting ants to the first sleep and silkworms for the first age of silkworms, after the first sleep to the second sleep of silkworms called the second age of silkworms, after the second sleep to the third sleep of silkworms is the third age of silkworms. Production generally will be 1-3 years old silkworms called baby silkworms or small silkworms. Small silkworms should be appropriate in the appropriate temperature and humidity range of appropriate increase in temperature and humidity, give soft and mature protein moisture content of mulberry leaves, fine feeding. Generally, the weight of 1-year-old silkworms increases 15.95 times more than that of ant silkworms, and the body area increases 5.11 times. 2-year-old whole silkworms increase 106.38 times more than that of ant silkworms, and the body area increases 29 times, and the weight increases 6.67 times more than that of 1-year-old silkworms, and the body area increases 5.67 times. 3-year-old whole silkworms increase 555.32 times more than that of ant silkworms, and the body area increases 88.32 times, and the weight increases 5.08 times more than that of 2-year-old silkworms, and the body area increases 5.67 times. area increased 5.67 times. Stronger silkworms After the third to the fourth sleep, the silkworms are called 4-year-olds, and after the fourth sleep, also called the big sleep, the silkworms are called 5-year-olds. It is customary to call 4-5 year old silkworms strong or big silkworms. The big silkworm period, the body of the large amount of food mulberry, off the chain is to do a good mulberry full of food. Generally, the weight of 4-year-old silkworms increased by 2,553.32 times compared to ant silkworms, and the decent pole increased by 23l .86 times. The weight of 3-year-old silkworms increased by 4.72 times, the body area increased by 2.62 times. 5-year-old silkworms increased by 10,425.53 times the weight of ant silkworms, the body area increased by 520 times, the weight of 4-year-old silkworms increased by 4.08 times, the body area increased by 2.24 times. Sleeping Silkworms After ant harvesting, the body of the silkworm grows rapidly due to feeding on mulberry leaves, and the color of the body gradually changes to white, white, green, and then to milky white and milky yellow. At this time, the appetite decreases and stops eating completely, and spits out a small amount of silk (commonly known as trip wire), fixes the abdominal feet on the seat of the silkworm, and the head and chest are lifted up, and no longer moves, and this state is called sleep. This state is called sleep. At this time, the silkworms are sleeping silkworms. From the collection of ants to mature, - generally sleep four times, the process of sleep and sleep silkworms are basically the same state, just sleep cocoon size is different. Sleep time is called sleep, under normal feeding conditions, sleep time to the fourth sleep the longest about 2d, to the second sleep the shortest only 20h or so, the first, three two sleep each need about 1d. Silkworms sleep in the silkworm. Appearance seems to be stationary, the body is ready to molt, to be stripped of the old skin, replaced with a new skin, the growth and development of silkworms into a new age. Just molt of the silkworm is called the beginning of the silkworm. Just up the silkworm, the head of the mouthparts are more tender, appetite has not yet been launched, generally to wait for half a d or so to be the head of the milky white gradually turned grayish-brown when you can give the mulberry rates food. Production in order to operate convenient. Generally take the same batch of silkworms in 95% or even the vast majority of sleep silkworms up Qi, and then to the mulberry rates. Mature silkworms to the end of 5 years old, it gradually reflected the characteristics of maturity: first, the discharge of fecal pellets from hard to soft, from dark green to leaf green; appetite loss, the amount of food decreased. The front of the digestive tube is empty, the chest was translucent; completely stop eating, body shortening, the abdomen also tends to be transparent, only the tail can be seen vaguely still residual 2 - 3 feces, the silkworm body head and chest up, spit silk, swing up and down around looking for cocoon place, to this point, the silkworm is said to be ripe or ripe silkworms. In contrast. Only the chest was transparent silkworms called immature silkworms; has spit out more silk, the body was transparent silkworms called overripe silkworms. In group rearing, the earliest ripe silkworms called the first ripe silkworms, the number is not much; after half a d or 1d after a large number of mature called mature silkworms; after a large number of nests there are still a small number of need to continue to eat mulberry the next day to mature silkworms called the end of ripe silkworms. Generally, the age is calculated from the point of collecting ants to the point of full maturity. Sleeping from the beginning of the ants to mature spitting that is the entire larval period, the number of times the silkworm sleeps is a characteristic, called sleep, sleep is a genetic trait, the existing silkworm species resources are sleep twice the two-sleeping silkworms, sleep three times the three-sleeping silkworms, sleep four times the four-sleeping silkworms and sleep five times the five-sleeping silkworms. Sleeping sex is controlled by the main sleep gene located on chromosome 6, but also due to the influence of temperature, nutrition, light and other conditions and certain changes. China's current common word breeding of four-sleeping varieties of silkworms, in the actual rearing process will sometimes appear a small number of three-sleeping silkworms or five-sleeping silkworms. Sleeping more varieties, larvae during the long, eat more mulberry, cocoon, silk thick high; Sleeping less varieties is the opposite, the advantages and disadvantages of the two, is generally believed to raise four sleeping silkworm varieties of the most economical. Silkworm age, also known as age. Common rearing of the two chemical four-sleeping silkworm varieties have five age, ants to the first sleep for the first age, sleep up into the second age, and then sleep into the third age, the third sleep for the fourth age, the fourth sleep that is commonly known as the big sleep into the age of five. The length of an age period is called the age period, which includes the time of eating mulberry and sleep in two parts. The shortest age passage is about 3d for age 2, 6-8d for age 5, 3-4d for age 1 and age 3, and 4-5d for age 4. The time and day from the collection of ants to the nesting of cocoons is called the whole age passage. In an age within the age and divided into the age of the beginning, age, age three stages, the age of the beginning of the mulberry less food is called less food period, age in the mulberry more food is called full of food period, the age of the end of the gradual reduction of food is called the food period, will be close to the time called sleep period, stop mulberry sleep is called sleep or sleep in the sleep period. Cocoon mature silkworm spitting cocoon and cocoon knot system cocoon net, knot system cocoon clothing, knot system cocoon layer, knot system pupa lining four processes. That is, after the mature silkworm nest, looking for cocoon place, the first light will be spat out of the silk bonded to the nest, and then spat out of the silk linked around the nest branch, the formation of cocoon support. At this time, the mature silkworms will be excluded from all the residual feces, and then continue to spit the silk knot cocoon network. Cocoon net does not have a cocoon shape, just loose and messy cocoon silk layer, as a further cocoon support. After knotting cocoon net, continue to spit out messy silk circle, thickening the inner layer of the cocoon net, in an s-shaped way to spit out the silk knotting cocoon, began to appear cocoon outline, cocoon silk thin and brittle, d arrangement is by no means a rule, the silk gum content is also more. After the formation of cocoon coat, the cocoon cavity gradually become smaller, before and after the body of the silkworm to the back of the two ends of the bend, into the "c" shape, continue to spit out cocoon silk, spit the way s-shaped change into ∞-shaped, the direction of the silkworm and the perpendicular to the body, and the axis of its 1 -2mm, every 15 ∞-shaped silk circle composed of a group, called a cocoon piece. When a cocoon piece is completed. And turn to the neighboring parts. Continue to do the 2nd cocoon piece, the 3rd cocoon piece ......, by many cocoon pieces to form the cocoon layer. Silkworm due to a large number of spitting and spitting in the consumption of energy, the body is greatly reduced, the head and chest swing speed slows down, and there is no certain rhythm, ∞-shaped silk circle also lost the original uniformity. Spitting is very messy, so the formation of loose soft cocoon layer called pupa lining. Finally, that is, after knotting the pupal lining, the silkworm head up, tail down, spit out the last remaining in the body of the silk material, the formation of a soft top of the cocoon. At this point, the process of cocooning is over, and the silkworm enters the pupal stage. Silkworm cocoon Silkworm spitting cocoon, is the raw material reeling silk. Hybrid silkworm species raised out of the cocoon, cocoon color white, cocoon oval or light Cambodian waist-shaped, cocoon size that cocoon length × cocoon width of roughly 3-3.5 × 2-2.5cm. Cocoon is by the cocoon, cocoon layer, pupa and molting four parts of the cocoon layer is thick and hard, the outer surface of the cocoon was a layer of loose cocoon coat, cocoon coat and cocoon layer has a more obvious boundary, peel off the cocoon coat can be seen after the cocoon layer of the peculiar luster and wrinkles. Split the cocoon layer, there are silkworm pupae and pupae left behind when molting skin. The weight of a cocoon is called the whole cocoon, the light is the weight of the cocoon layer is called the cocoon layer amount, the cocoon layer amount of the percentage of the weight of the whole cocoon is called the cocoon layer rate. The whole cocoon amount of 1.5-2.5g, cocoon layer amount of about 0.3 0.55g, cocoon layer rate of about 20% 25%. Pupa Silkworm pupa after 4d or so, the pupa pupa body was spindle-shaped, divided into the head, thorax, abdomen, three body segments, the head is very small, a pair of compound eyes and a pair of antennae on its ventral surface; thorax has 3 body segments and 3 pairs of thoracic feet, 2 pairs of wings; abdominal 9 body segments, in the 8th abdominal section of the ventral surface of the middle of the x-shaped line, the 9th abdominal section of the ventral surface of the middle of the brown dots, respectively, for pupal stage of the male and female gender body surface features, silkworm species Breeding is often based on this in the pupal stage to distinguish between male and female. Silkworm just pupation, pupa color yellowish, pupa body tender soft, with the advancement of the pupal age gradually become yellow, yellow-brown and brown, pupal skin is also gradually hardening. Pupal period after about 12-15d, to be soft pupal body again, pupal skin moderately wrinkled earth brown, is close to the moth. Silkworm pupae are rich in nutrients, can be used as food or feed, can also be refined pupal oil and pupal protein for chemical or pharmaceutical raw materials. Silkworm Moths (Adult) Silkworm moths resemble butterflies, but the two pairs of wings are small and have lost the ability to fly, and the light will vibrate. Silkworm moths are covered with white scales, and can be clearly divided into three body segments: head, thorax and abdomen. The head is small spherical, with bulging compound eyes on both sides, and a pair of bipectinate antennae in front of the summer eyes; the thorax is 3-segmented, the ventral surface of each long l pair of thoracic peduncles, and the dorsal side of the 2 pairs of wings. Some species have a faint wing pattern. Abdomen has no gastropods, the terminal body segments evolved into external genitalia. Male moths are large, slow crawling, low frequency of vibration; male moths are small, faster crawling, high frequency of wing vibration. Generally, female moths can lay fertilized eggs when they mate for 3-4h. Silkworm breeding, male moths to be cross-tailed, seed production after the end of the waste; female moths to be laid eggs after Cambodia in accordance with the provisions of the bag into the moth box, sent to the mother moth microparticle test. Chemistry silkworm in natural conditions, the occurrence of several generations within a year is known as the characteristics of chemically; only one generation within a year that is the production of stagnant eggs is called a chemically; occurred in two generations, the first generation of non-stagnant eggs, the second generation of stagnant eggs is called two chemically; occurs in three or more generations of the so-called multi-chemically, of which some varieties of the last generation of production of stagnant eggs, and some varieties of the last generation of production is not the production of stagnant eggs. A chemical variety of cocoon silk more, but the larval period is long, more food mulberry, physique is weaker; multi-chemical varieties of larval period is short, less food mulberry, physique is stronger, but cocoon small silk less; two-chemical varieties between the two, the comprehensive economic benefits to two-chemical varieties for the best, so the current production of more than the use of two-chemical varieties of silkworms. With a chemical or multi-chemical pedigree of the two chemical varieties, its chemical properties will be affected by temperature, light, humidity, nutritional conditions and change, so need to be in accordance with the characteristics of varieties and feeding precautions feeding. Lagging As a special developmental state, lagging is a genetic characteristic of insects formed in the process of evolution, characterized by lower metabolic levels, morphology pause, in fact, it is the instinctive response of insects to the cyclical changes in environmental conditions, that is, to a particular stage of development will pause the growth of development, and then continue to grow and develop until the natural environmental conditions of the cycle to achieve its state of growth and development. Mulberry silkworms are stagnant in the egg state. Fertilization begins under natural conditions after the low temperature of autumn and winter, and can only be lifted in the following spring; or artificial methods, or low-temperature refrigeration of about 5 degrees Celsius, or high-temperature (46 degrees Celsius) hydrochloric acid treatment, or a combination of refrigeration and acid-impregnated methods, which can be lifted to stop the occurrence of stagnation, and to promote stagnation lifted after the incubation of the hatching of the same. The lagging performance of dichotomized varieties is subject to certain changes due to a combination of temperature, light, and nutritional conditions

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