Rebirth of the God-level Xueba

Gu Qiang operated according to the plan, and first performed simultaneous estrus.

Synchronous estrus is to use some exogenous hormones to artificially control the estrus cycle of a group of female animals, so that embryo transfer can be organized in a planned manner within a predetermined time.

There are many drugs that can be used for exogenous hormones, and the control effects are strong or weak, and the efficiency is high or low, which is not very rare. What Yang Rui discussed with Professor Wang Yong that day was the existing exogenous hormones - it is easier to use the existing ones than to redevelop them, let alone such non-critical mature drugs.

Of the 200 Simmental cows on site, 186 have entered the estrus stage, and the success rate exceeds 90%, and it will not be easy to improve.

The remaining 14 looked at their companions in a daze, not knowing why they suddenly became different.

A younger cow was circling anxiously.

She was surrounded by cows that were already in heat, mooing non-stop, hunched over, impatient, and looked different from usual.

This very young cow, after turning 20 or 25 circles, made a decision resolutely. I saw that she also bowed her waist and followed the example of other cows to give up the trough. Then he raised his hooves impatiently and turned his head to the bullpen where the bull was.

Finally, the heifer managed to get the attention of a veterinarian.

He put on his heavy rain boots again, took the equipment, and went up to check.

Gu Qiang also raised his head and asked, "In heat? That's 187 pigs?"

Comrade Qin Yue, a veterinarian from China Animal Husbandry, watched the cattle for a while, then came back and took off his glasses to wipe them, and said, "No, there are still 186 cattle."

"Isn't it? It looks like it."

"It's pretending." Qin Yue put on his glasses and answered concisely.

The crowd around the bullpen laughed softly.

Gu Qiang shook his head with astonishment.

He spends a lot of time in the laboratory and a short time in the field. However, this is the case for most of the researchers. Those sent to the field are often the lowest senior members of the research group or project team, or assistant researchers, or doctoral students, or graduate students, and sometimes even undergraduates.

However, genetic engineering labs don't have junior lab dogs to exploit.

In the genetic engineering laboratory, the person with the lowest seniority is Yang Rui, who has three years of scientific research experience, which is similar to that of ordinary master's graduates. Go out yourself.

Fortunately, China Animal Husbandry Corporation has fully equipped the auxiliary manpower for the sake of 200 Simmental cattle.

Hearing Gu Qiang yell "Superovulation begins", a cowherd brought the cows in heat one by one, weighed them first, and then recorded them.

Four veterinarians from Zhongmu lined up and gave injections to the cows one by one.

Qin Yue was at the front, not only in charge of injections, but also responsible for reporting numbers and judging the health status of the cattle.

Gu Qiang stood behind the veterinarians, sucked gonadotropin into the needle according to the reported weight data, and handed it to the veterinarians respectively.

It was Yu Xing'an who helped Gu Qiang. He watched the veterinarians to ensure that all the medicines in the needles were injected into the correct cows.

After the entire injection process was completed, Yu Xing'an even poured a large amount of foamy water on the veterinarians in the name of disinfection.

Even if someone secretly squeezes a little of the medicine on the body, the whole bucket of disinfectant will destroy the activity of the medicine.

Director Tie from Qingmu, who has been reporting on his duties in the capital recently, came here on purpose today. Seeing this scene, he couldn't help smiling slightly, and said to the proud and bony Director Mei next to him: "Look, the people from Zhongmu give you money. No matter how much, it is still not trusted."

"There's no need to sow dissension, you are too young to play this game." The proud and bony Director Mei has always despised the strategic ability of the broad-shouldered and strong Director Tie.

Director Tie chuckled, and said, "No need to stir up trouble, just look at it, it's just a gonadotropin, they are hiding it for fear that you will find out."

Director Mei's face was also a bit ugly, and said: "They may have researched some special hormones, and it is normal not to let other units know."

"Even if you can reach five ovulations at one time, so what? I heard that the latest foreign technology has gonadotropins that ovulate six or seven ovulations. This thing is not used much. At worst, just spend money to buy it. You give it to me." How much money is there?" Director Tie doesn't care about the relationship between Haidian District's genetic engineering laboratory and China Animal Husbandry Corporation, he just wants to scare Comrade Lao Mei. Of course, it would be even better if the relationship between the two parties was ruined. He dreamed of monopolizing this resource.

Director Mei has been at odds with Director Tie since he was in school, but he secretly agrees with what he just said.

Director Mei twisted his neck uncomfortably, and said: "Yang Rui is a young man after all, and this genetic engineering laboratory in Haidian District is also a new laboratory. They finally developed new technologies, even if only 60% of foreign products Its effectiveness is also worthy of respect.”

"Hey, it's different for those who work in Beijing. It's a series of official words." Director Tie laughed twice, but shouted to the veterinarian in front of him: "Did you see the eggs? How many eggs?" ?”

What he asked was, of course, how many eggs were released by ovulation.

Anyone who has studied biology in junior high school knows that an embryo comes from the union of a sperm and an egg. The number of sperm released by a bull at one time is extremely large, tens of thousands, and the eggs are extremely scarce.

For a cow with only one litter, the cow has fewer eggs, often only three to four. In other words, the number of embryos available for embryo transfer is actually determined by the number of eggs.

If a cow ovulates 4 eggs at a time, and all of them develop into grade A embryos, then, after one embryo division, it is possible to get 8 half embryos.

Even if the success rate of semi-embryo transplantation is 50%, for fine-bred cattle, this is double and double the breeding efficiency, not to mention that multiple ovulations can occur within a year.

However, commercial operations have always been unable to achieve ideal data, and the desire of capital cannot be satisfied by 4 or 8 times the efficiency.

In developed countries other than China, the reason why biotechnology companies spend tirelessly on embryo transfer technology is that they have improved the success rate in all aspects.

For example, in the process of collecting embryos, the purpose of injecting gonadotropin is to obtain more than 4 eggs...

In an era when an egg basically represents a cow, it is inevitable to develop better and better gonadotropins.

From the 1970s to the 1980s, the alternation of gonadotropins was not only to obtain more eggs, but also to reduce side effects and increase the proportion of usable embryos.

In this segmented field, domestic research institutes naturally lagged behind again. It should be said that there was basically no research, and the technology introduced in Eastern Europe in the 1950s and 1960s was introduced and used.

However, the difference between five eggs and seven eggs is not a man, but two cows.

The veterinarian Qin Yue walked over with rain boots and a notebook in his hand. He called out "Director Mei" and then "Director Tie", and asked softly, "You call me?"

"I'm calling you, Director Mei wants to know, how many eggs does a cow have?" Director Tie couldn't see any expression on his face, he looked very serious.

"It's not very clear yet." Qin Yue looked at the notebook and hesitated.

"Just tell me what you know." Director Tie has been a ranch all his life, and he doesn't leave any room for his words.

Qin Yue turned his face to Director Mei.

Director Mei let out a "huh" and said, "If you ask me, tell me as much as you know."

"Yes." Qin Yue looked down at the notebook again, and said: "We have checked twelve cows so far, and the corresponding ovulation numbers are 10, 12, 11, 10, 13, 9, 12 pieces..."

"Wait, I'm asking you about the number of eggs, how many are there in a cow?" Director Tie's eyes widened.

Qin Yue supported the mirror frame and said, "I'm talking about a cow."