Chen Cheng has not been idle in the past few days, and has learned all the existing pig breeding and cultivation techniques.

I also read a lot of excellent papers from abroad.

The more he learned, the more he realized that pig breeding and cultivation are really not so simple.

There is so much to learn from the prevention and treatment of infectious diseases alone.

Common infectious diseases of pigs include swine fever, swine erysipelas, pig paratyphoid, pig yellow and white dysentery, swine flu, swine dysentery, pig tetanus, pig infectious gastroenteritis, pig anthrax, pig asthma, various skin diseases, pig fungal enteritis and other epidemic diseases.

In the history of pig breeding in China, there have been many large-scale spread of pig infectious diseases, and in serious cases, many excellent breeds of pig breeds in China have disappeared.

This is also an important factor that most of the domestic pig breeds in China come from abroad.

However, this time, Chen Cheng is not studying the infectious diseases of pigs, but studying the reasons for their breed differences, and how to achieve the taste quality of Iasi black pigs under ordinary feeding conditions.

This doesn't have to be thought about, it definitely involves the DNA study of different breeds of pigs.

After scanning the genetic information of common Landrace pigs from the market, Chen Cheng rushed to the school's breeding center.

At this time, Lao Xu was feeding the Iasi black pig.

"Lao Chen, you came just in time." Lao Xu put down the things in his hand and beckoned to him.

"Lao Xu, how is the piglet?" Chen Cheng asked.

Lao Xu spread out the rice bucket in his hand and handed it to Chen Cheng.

"Look, it's all pigweed I cut from the village and added some chaff."

Bran is the brown husk left over after the rice is threshed, which is generally ground into flour and eaten by livestock and poultry.

Because people now have high requirements for the taste of rice, they will thresh many times during threshing, resulting in a lot of nutrients left on the bran husk of rice.

Rice bran is very nutritious, such as crude fiber, protein, and rice bran includes fruit peel, seed coat, lake powder layer, rice germ, etc., which contains more than 50% of the nutrients of rice, which is the essence of rice.

"The Legend of the Fairy Tree"

It's not that it's useless, it's that it tastes so bad that no one can eat it.

Chen Cheng nodded and said, "You didn't feed it, did you?" ”

Lao Xu raised his eyebrows and said, "Of course not." Didn't you remind me of this? ”

Chen Cheng picked up the piglet, scanned its genetic information with his eyes, and then put it back in the cage.

Lao Xu asked: "Have you thought of a research idea?" ”

Chen Cheng said: "It's about to happen." You patiently feed for a few more days. ”

Lao Xu said: "It doesn't matter how many days you feed you, the main thing is that I can't wait to see your innovative technology in animal husbandry." ”

Chen Cheng smiled and didn't say anything.

Back in the lab, Chen Cheng called up the system.

Now he has two different pieces of pig DNA information in front of him.

He decided to start with the differences in their appearance.

After all, observation is the easiest and fastest method of scientific research.

"Generate 3D simulation models of them." Chen Cheng said.

【Okay】

The system projects the appearance and body shape of the two breeds of pigs.

You can see the difference at a glance in terms of body size.

The Iasi black pig is a characteristic of the traditional Chinese native pig.

The black pig has black body hair, a well-proportioned structure, strong limbs, a slightly longer head, and horizontal wrinkles on the forehead.

The ears of the black pig are medium, soft and droopy, the skin is less wrinkled, the neck is rarely drooping, the back and waist are straight, and the belly is large but not mopping. The hindquarters are weaker and slightly higher than the prodrome.

The breed of white pig is a common longrace pig breed in China, with a white coat all over the body. The body is wedge-shaped, light in front and heavy in the back, the head is small and the nose bridge is long, the ears are mostly stretched forward, the chest is moderately wide and deep, the back and waist are extraordinarily long, the dorsal line is slightly arched, the abdominal line is straight, and the hindquarters are plump.

In terms of body size alone, Landrace pigs are more slender and black pigs are more stocky.

The long bones are conducive to rapid weight gain, so Landrace pigs will naturally end up with a larger weight than black pigs.

"Simulate the growth process of two pigs at the same time." Chen Cheng said.

[Are you fed the same nutrients?] 】

"Feed according to the cultivation habits of Landrace pigs first."

【Okay】

Chen Cheng could see that the supercomputer fed the two pigs the same raw materials such as corn, wheat bran, bran flour and feed.

During the one-minute simulation, Landrace pigs performed significantly better than black pigs, and the difference between the two reached the maximum after the simulation.

[Simulation duration: 6 months.]

Simulation results: Landrace pigs are 1.7 meters long and weigh 310 kilograms.

The Iasi black pig is 1.1 meters long and weighs 130 kilograms. 】

"The Iasi black pig breed is really strange, it doesn't grow big when fed with feed. Is it really genetically conditioned? ”

Chen Cheng was puzzled and pointed to the genetic analysis of the supercomputer, and compared the gene chains of the two pigs by region.

When it comes to DNA, most people have the impression of a double-helix staircase in a textbook.

In fact, the real DNA strand is longer than most people think.

As we all know, the most basic components of DNA are base pairs. Base pairs are the chemical structures that form DNA, RNA bullets, and encode genetic information, that is, the length of DNA and RNA can be measured by base pairs.

Take human cells as an example, the length of a base pair is 10 to the minus 9 power of 0.34nm, and a cell has 6 billion base pairs, so the final length of all base pairs in a single cell in the human body is 2.04 meters.

Who would have imagined that the DNA inside a cell could be 2 meters long?

Expand a little more.

According to scientists' calculations, the number of cells in the human body is about 50 trillion, and it can be calculated that if all the base pairs are connected end to end, the length is 102 trillion meters, which is about 102 billion kilometers when converted into kilometers.

How far is that?

The average distance between the Earth and the Sun is 150 million kilometers. In other words, if all the DNA in the human body were unfolded and pulled into a line, the distance obtained would be 102 billion kilometers, and it would be possible to travel back and forth from the earth to the sun about 340 times.

But the good news is that most of the DNA is ineffective, and only a few fragments of it really contain specific genetic material.

Chen Cheng once read a paper on the analysis of effective functions of DNA.

After comparing the DNA of many animals, the researchers found that 8.2 percent of human DNA was "functional," meaning that the DNA was functionally important enough to survive human evolution, the paper said.

The remaining 92% of the human genome has not yet been found to have any role in human heredity. The researchers concluded that the 92% of DNA is just fillers, and they may be waste products or have undiscovered functions.

In other words, maybe one day humans will be able to activate these 'useless' parts and then gain superpowers or something.

But for now, Chen Cheng only analyzes the useful parts.