Sun Xiangfu naturally hopes to display the cartoons of Jiuyuan County in Chang'an, a place that can represent the core of the Tang Dynasty, because in terms of popular science knowledge, only in the most populous pass, the efficiency is the highest.

And looking for the eldest grandson Wuji to collect money is to tell those children and their parents that what they learn can create economic value for them, which is many times higher than farming, and their talents and specialties are useful.

Soon, the eldest grandson Wuji and a group of officials followed Sun Xiangfu to a place called 'Biological Nature' exhibition area, here, there is also a small stage, and there are many moving wooden boards with wheels on it, and people who have been to Minxue know that this is called an activity blackboard.

A student who looks to be in his teens is holding an indicator stick and explaining to the crowd of onlookers the whole process of an insect, from eggs to adults.

"You seem to have talked about this thing in the folk studies class, I remember, there are still a lot of pictures hanging in your folk studies classroom, which is to teach the common people to recognize pests." The eldest grandson Wuji was the first to speak, and the officials who knew a little about the civil studies class in Jiuyuan County also nodded, casting a puzzled look at Sun Xiangfu to see why he invited himself to see these things they knew.

However, Li Ke and Li Yuanjing and a few other guys who have been studying here for more than two years frowned when they saw the pictures on the small stage and listened to the content explained by the student, this is not simply teaching the people to recognize pests! This is clearly teaching the people to raise insects.

"The superficial knowledge of recognizing pests is only suitable for teaching ordinary people in the folk studies class, and the real biological science and technology must have a certain level of education in order to learn and understand, such as the flies that this child is talking about now, everyone recognizes and knows that it is a pest!

But why don't you understand what this kid is talking about, but many people listen to it with relish and want to learn? Because, he is talking about how to raise flies, how to let the common people make money by raising flies. ”

"Flies, breeding? What is this thing raising it for? In the summer, it flies everywhere, how much is it worth······?"

Before the eldest grandson Wuji could react to what was going on, many other officials who thought that the flies were unclean and were big pests began to shout first, but Li Ke and Li Yuanjing were relatively quiet, and Li Yuanchang had a lively expression and did not say anything.

Seeing this, Sun Xiangfu turned around and walked to the stage, but the eldest grandson Wuji stood beside Li Ke and asked, "Do you know the benefits of raising flies?" ”

Li Ke nodded and said, "I have roughly guessed something, and I don't know everything, perhaps, if the pests are used in the right place, they can also bring benefits to us humans!" The eldest grandson should have seen some pictures of circular chains posted here, which are the biological chains mentioned in the biology and nature textbooks of Jiuyuan County, and these flies and moths are in the previous chain, there are chickens, ducks and geese. ”

"You mean, people can raise these flies to feed chickens, ducks and geese?" The eldest grandson Wuji said with some understanding.

Li Ke nodded and said, "It should be like this, many of these people are the people of my Jinan County, they are usually responsible for poultry breeding, you can listen to what the teacher says, and you will know what is going on." ”

Sun Xiangfu came to the stage, the student who was talking about the process of adult flies on the stage, stopped the lecture, Sun Xiangfu motioned for him to give the indicator stick to himself, he knew that Sun Xiangfu was going to talk about the rest of the content, handed the indicator stick to him at the same time, and the other two students on the stage, began to select some pictures that had not been hung up before, ready to replace at any time.

At this time, Sun Xiangfu also cleared his throat and began to speak, "Everyone knows that chickens, ducks and geese, the favorite thing to eat is insects, fish and shrimp, people who have studied breeding in the breeding industry of Jiuyuan County should also know that chickens and ducks that feed on insects, fish and shrimp, the eggs that lay out, the yolk is more red, the salted eggs are pickled, and the egg yolk will have more oil in the egg yolk, which is more flavorful. The nutritional value of food is different, and the eggs born are naturally different, and many people may not understand the word 'nutritional value', so I will make an analogy to explain it to you!

A pregnant woman, after being pregnant with a child, eats good tonic every day, a pregnant woman, after conceiving a child, eats bran coarse grains every day, which can only deceive the stomach, then, the children they give birth to, there is a difference, pregnant women who eat tonics, will give birth to a big fat boy, pregnant women who eat dregs bran coarse grains, will give birth to a skinny, malnourished boy, put this truth, set on chickens and ducks to lay eggs, it is roughly the same, everyone understands it! ”

A smart person like Eldest Sun Wuji, after listening to Sun Xiangfu say this, he naturally understood, and said, "I said that the eggs produced here in Jiuyuan County are more delicious than those produced in Guanzhong!" It turns out that the problem is here, if you ask these students to teach the people to feed the flies, it is equivalent to making tonic for the chickens and ducks! ”

Sun Xiangfu nodded, and said to the eldest grandson Wuji in the audience, "There are some reasons, but not necessarily. ”

"Then please make it clear to us that this is a matter of production for the people, and those of us who are officials should also know more."

Eldest Sun Wuji is very well praised, Sun Xiangfu nodded and said, "Then I'll tell you, you know, a chicken and duck, how much food a day to eat, and how much cost do we need to provide them with these foods?" Also, what is the return for adjusting their diet? ”

All right! At the beginning, some officials who had listened to civil studies classes or inspected various breeding industries under their jurisdiction might be able to reluctantly answer it, but as for the latter ones, they could only have circles on their eyes.

Soon, a tabular picture was hung on the activity blackboard by a student, Sun Xiangfu pointed to the data on it with an indicator stick, "If you raise chickens in large quantities and feed them grain grains, the average daily price is more than two taels, and an adult chicken consumes more than seven catties a month." Eighty-four catties a year, an adult duck, an average of more than three taels of grain per day, an average of more than nine catties per month, one hundred and eight catties a year.

Based on the current price of grain in my Shannan Province at 40 wen and 1 stone, each penny can buy three catties of rice, so the cost of raising an adult chicken in terms of grain is 28 wen a year, and the cost of raising a duck in terms of grain is 36 wen. ”

Sun Xiangfu pointed to the numbers in the table hung by the students, and everyone understood, of course, these data are not the key, what they want to know most now, is the benefits of raising flies.

Seeing that everyone nodded their heads to show understanding, Sun Xiangfu said again, "The business value of grains and insects, fish and shrimp is different, just like what I said in the analogy just now, they are coarse grains for chickens, and the other is tonics, so feeding chickens and ducks different foods, we get the quantity and quality of eggs, which are also different."

Here, there is a data counted by our students, based on the chicken breed with the highest egg production rate raised in our Jiuyuan County, feeding grain and grain, calculated by 1,000 chickens, of which the chickens that lay the most eggs per year reached 187, and the average annual egg production of 1,000 chickens was 154, and within a year, 120 died.

In the other 1,000 chickens fed with half the proportion of insects, fish and shrimp, and golden cauliflower and other green materials, the highest annual egg production reached 237, and the average annual egg production of 1,000 chickens reached 205, and within a year, only 43 died, that is, even if the nutritional value of the eggs laid is ignored, just from the number of eggs laid, the eggs laid by a chicken are 51 a year, and the mortality rate is more than doubled. The economic value of the difference in this is calculated by everyone! ”

Through the meal when he gave Sun Xiangfu a New Year's gift before, the eldest grandson Wuji knew the importance of officials being familiar with market prices, so he had already issued an order to let the officials under his rule find out these situations, and now, the officials present roughly know the price at which the people in Shannan Province sell eggs, duck eggs, or chickens and ducks to the merchants who receive the goods, among which raw eggs are about ten yuan a catty, about eight, and duck eggs are eight yuan a catty, about seven. Of course, the eggs laid by chickens and ducks in Jiuyuan County are generally not sold out, because they will make them into braised eggs, salted duck eggs, egg cakes, cakes and the like, and the price will be doubled.

Just from the aspect of eggs, the output value of a chicken, the gap, is more than 60 Wen, plus the survival rate, evenly distributed to the head of each chicken, at least the gap is more than 80 Wen, because, the dead chicken, is not to lay eggs at all, more than 70 chickens, then a year can lay more than 10,000 eggs, and these live chickens themselves are also worth some money.

This number, if used in two chicken farms with a breeding scale of 100,000 birds, then the gap will be sea, that is 800,000 yuan, 8,000 yuan, and if it is calculated according to the number of chickens and ducks in the country?

You know, according to the statistics of the Ministry of Agriculture, the number of poultry in Datang is almost more than 2 billion, so isn't there a gap of 160 million yuan?

Of course not, because the assumption of Sun Xiangfu is not valid.

First of all, it is impossible for the people of Datang to feed chickens and ducks with grain, especially ducks.

Then there is that all the poultry in Datang now, can be like the children of Jiuyuan County with such a high egg production rate of chickens and ducks for experimental statistics, less than one percent, most of the people's homes, or feeding the chickens in the first few years, the annual egg production rate is at least one percent lower than that of their breeding, and the output of high-yielding laying hens in later generations is almost one egg per day, and there is still nearly half of it!

The purpose of he asked everyone to calculate this account is just to let everyone see the gap, not so much breeding, in fact, it really creates so much profit for everyone, there are more eggs and duck eggs on the market, the price will drop significantly, and the profit will continue to thin, it is impossible to produce more, and make more according to the price.