CATDOLL : CATDOLL: Profit analysis of spider farming

1. Profit analysis of spider breeding

We calculated according to the natural law of each spider (man-made breeding has more), a spider lays 250-350 eggs a year, the largest can lay more than 1,000 eggs each time, based on the lowest average number of eggs laid of 300 and the lowest survival rate of 80%. The finished product of the year is: 300 x 80% = 240, the purchase price of each spider is: 51.30 yuan, the total is: 240 x 51.30 yuan = 12,312 yuan. Spiders have a mixed diet, flies and small insects are its delicacies, artificial auxiliary feeding is mainly beef, mutton and eggs. We calculated based on the maximum cost. An adult spider is 25 grams, all artificially fed, not counting natural predation. According to the meat-eating ratio of 10:1, 6 portions of food are converted into one portion of spider (generally 8:1 is sufficient). Each spider needs 25g x 10 = 250g of food to grow into an adult. 240 spiders x 250g = 60kg. The price of beef per kg is 36, i.e. 60kg x 36 yuan = 2160 yuan. Other additional costs: 100 yuan per spider. The profit of one year: 1 = 10152 yuan. If 20 spiders are raised, the annual profit will reach more than 200,000 yuan.

2. The Mystery of Thin Spider Silk

①Spiders are one of the oldest creatures on earth. Human ancestors knew long ago that spider silk is strong and durable and can be used to weave fishing nets. Today, residents of Pacific island countries such as Polynesia and Tonga are still using this primitive tool to catch fish. It is much easier to get such a net than to weave it manually. You only need to put a special model wooden frame into the woods where spiders gather. In less than a month, the dense spider silk will wrap it tightly. Gently remove the spider silk from the model, and it will be a practical natural fishing net. Raoxue Teaching Network

②The magical spider silk has also attracted the attention of scientists.

③Scientists have discovered that spiders have six silk glands in their abdomens, which secrete different protein solutions or mucus. These solutions or mucus produce six types of silk under the pressure of the spinnerets under the spider's abdomen. The most resilient one is the traction silk, which is used to fix and support the hunting web. Another type of spiral spider silk on the hunting web has strong viscosity and is extremely elastic. After being stretched three times, it can still bounce back to its original shape. The bearing capacity and strength of spider silk are also amazing. Expert experiments have confirmed that the silk spit out by wandering spiders in the Amazon jungle is the strongest among its kind. Each thin spider silk can withstand a tensile force of 90 grams. If a pencil-thick spider silk can be made, it can hook a fighter jet landing on an aircraft carrier. Its strength is 6 times that of an alloy steel cable of the same thickness, but it is much lighter.

④Spiders have the habit of cannibalizing their own kind, so it is almost impossible to breed spiders artificially. Scientists thought of using genetic modification to obtain "spider silk" for the benefit of mankind. Unfortunately, after several efforts, scientists have not been able to obtain fibers with the same characteristics as spider silk through genetic modification. After research, they found that spiders somehow turned mucus into unbreakable silk in their spinnerets - not wet or brittle, but quite tough and elastic. In other words, simulating how spiders spin silk is the most difficult thing to do. [Content from raoxue.com]

⑤ There are still many mysteries of spider silk, and scientists will continue to explore the magical spider silk. raoxue.com

18. What are the benefits of starting with real-life examples in the first paragraph of the article? (3 points)

Key points of the answer: ① Use specific examples to highlight the magic of spider silk [Content from raoxue.com]

② Enhance the readability of the article and stimulate reading interest

③Introduce the following explanation of the mystery of spider silk.

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19. Read the following material and, with the help of the relevant knowledge in the above text, briefly analyze how scientists solved the problems of early bulletproof vests. (4 points) Rao Xue

Bulletproof vests are used to protect life safety in combat environments. Early bulletproof vests were just two steel plates stacked inside sturdy clothes. They usually weighed more than ten kilograms, were heavy and hard, and were inconvenient to wear, affecting combat. Moreover, this kind of bulletproof vest can only protect against grenade fragments and ordinary pistol shooting, and its protective performance is relatively weak. Scientists have developed artificial synthetic fiber fabrics based on the characteristics of spider silk and successfully produced bulletproof vests with better performance. This article comes from Raoxue Teaching Network

Sample answer:

Scientists have used spider silk’s toughness, good elasticity, and light weight to solve the problem of early bulletproof vests made of steel plates being “heavy and hard” and “inconvenient to move around” after wearing them; and have used spider silk’s strong bearing capacity and high strength to solve the problem of bulletproof vests having “weak protective performance”.

1The sky is also dark, like the roof of an old house covered with spider webs. The gray clouds piled in the sky are like white powder peeling off the roof. Seeking the mystery of autumn. The autumn rain is falling. The dense rain threads weave a gray curtain between the sky and the earth. The autumn rain, like silver-gray sticky spider silk, is carefully hidden under the green oval petals, revealing a little hope of the budding of new life. The rain is falling quietly, with only a little sound of dripping. Gong Chuchen N

3. What do you need to prepare to raise spiders?

Since the Red Rose is a large hairy spider, you should provide a large enough breeding box (usually 50×30×30cm in size), made of metal or glass, or even ordinary cardboard. However, you must do a good job of protection to prevent the spider from getting lost. Remember not to mix it with other species, but should be raised independently in a covered breeding box. Considering the ventilation factor, it is recommended to use wire mesh as the door or lid.

The base material can be cactus mud with a high sand content, or you can mix sand with sterile soil and lay it 5-10cm thick.

Like other animals living in desert shrubs, they do not need very high humidity (usually around 40-70%). The method is to place a shallow and stable small dish with a moist sponge or cotton ball inside to adjust the temperature and humidity in the breeding box and also absorb the spider's excrement.

You must also provide some shelter for it to hide, which can be made of tree bark/tree holes or coconut shells or clay pots. You can also arrange some small bonsai in it as you wish for easy viewing.

The main thing is that when you spray or add water, you must not get it on the rose. When cleaning the environment, it is best to place it in another container first. Roses like a humid environment, not soaking in water. You'd better understand this~ The simplest method is that if the bedding material is soil, you can spray the soil wet. If there is no bedding material to absorb water, take a piece of facial tissue (unscented) or toilet paper, gather it into a ball and soak it with water and put it in a corner of the rose cultivation container. It is enough~ Roses like to eat branch insects such as crickets, but they don't like to eat mealworms. However, if it is a very small rose, you can also tear the mealworms and let the roses absorb body fluids. Feed 2 or 3 at a time. If they haven't finished eating, it's best to take them out to prevent the crickets from biting the spider's body surface (hair) with their teeth. The most feared thing about raising reptiles is that they are mutilated, which affects the appearance~

Feeding tools:

1: A pair of long tweezers

Its purpose is to feed food, clean up residue and excrement, maintain internal hygiene, etc.

If you are raising a docile hairy spider like a red rose, a length of 15 cm is sufficient. If you are raising a fierce hairy spider like a tarantula, the length should be at least 20 cm. Because metal tweezers are more expensive, you can also use longer chopsticks instead, but they are not as convenient and hygienic as tweezers.

2: A water bottle for watering or rehydrating

Because the environment of hairy spiders needs water, a water basin must be placed in its breeding box, and water must be sprayed inside to ensure humidity. Most hairy spiders do not like humid air like chameleons, so we do not recommend using a sprayer, but a spray bottle with large holes. If you can't find a spray bottle, you can use a plastic mineral water bottle with some small holes on it instead.

3: A dedicated caregiver

Hairy spiders are the easiest pets to keep, but you should not take them lightly. They also need your careful care!

Food: There are many kinds of food that can be fed to hairy spiders. Various living insects are its main food, such as crickets, grasshoppers, oil gourds, katydids, cockroaches, etc.

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It should help you

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Whether the domesticated spiders are highly toxic or very weakly toxic, they need to be kept in a closed environment with fixed feeding tools. The following types of feeding equipment are commonly used:

1. The wooden box or other material box for feeding is mainly a place for spiders to rest and live. The height of the wooden box should be about 1 meter. The wood board only needs to be smooth on the outside, and the inside can be rough to facilitate spiders to crawl. There is a valve at the bottom of each side of the box to facilitate operation inside the box. The top and four sides of the box are surrounded by nylon mesh for ventilation and light transmission. The box can be arranged to simulate natural living conditions, which is convenient for setting up nets, living and hunting. You can put a culture dish with water and another dish with artificial feed.

2. The lampshade for breeding is another type of breeding equipment for spiders. It is more suitable for medium-sized spiders that do not weave webs. First, use gauze to make a hole on the top of the lampshade. Then install a hollow glass tube to provide water and food for the spider. Place a white porcelain basin that is larger than the lampshade on the top of the lampshade. Spread a layer of fertile soil in the basin. At the same time, you can plant some plants suitable for the growth of spiders to create an environment more suitable for spiders to live in.

Regardless of the size of the domestic spider, do not touch it easily to avoid being bitten by the spider. Generally, when feeding, do not touch the spider directly with your hands. You can choose a long wooden stick as a feeding tool to feed the spider. Especially when the family raises poisonous spiders, you need to pay more attention to the feeding method and pay attention to the safety of yourself and your family.

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