The dragons enjoyed a pleasant dinner in the midst of a bustle of joy, and while all the dinosaurs were satisfied, one reality immediately became apparent: they had eliminated a tenth of the huge bison herd in a single meal.

If you eat one meal in three days, within a month, this huge herd of bison will be extinct, so for a few years, although the dragon herd is huge, no creature can threaten their survival, and a new generation of small dragons has also been born, expanding the number of dragons by one-tenth.

But the ensuing embarrassment has become apparent, many large animals like bison are slowly disappearing in this river beach, and the same fate has suffered from herd animals such as wildebeest, zebra, wild deer, etc., and the food chain near the dragon herd gathering place is becoming more and more unbalanced, and the consequences of the mass slaughter of prey have gradually become apparent, and the amount of food will become more and more scarce.

This situation is the same as in the early days of the Cenozoic, when the dragon herd could sweep away all the animals that could be eaten within a few tens of kilometers in a few days, resulting in the number of dragons never expanding, and eventually they could not evolve to small sizes, and the number remained scarce.

Judging by the amount of food in recent years, the hope of the dragon group to reproduce on a large scale will be in vain, and each time a small dragon is added, the food consumption will be a point larger, and in the long run, the number of dragons and African wild lions will not be able to expand on a large scale, and can only be maintained on a small scale.

This situation is contrary to Zhang Jun's original intention of hoping to make the dragon herd grow as soon as possible, if the number of dragons is insufficient, it will not be possible to let more dinosaurs participate in the construction of a civilized society, that is, there will be no more labor force to participate in the construction of new skills, new production technologies and all the achievements related to the new civilization.

Zhang Jun thought about this question many times, and he thought that human ancestors should have mastered the cultivation technology of rice and other crops thousands of years later, so as to meet the large food needs of human beings after living in groups, and this method began to be considered by Zhang Jun.

And dinosaurs have always been pure carnivores, so human crops are meaningless to them, unless Zhang Jun has a way to turn dinosaurs into omnivores.

Although for tens of millions of years, some dinosaurs have evolved in this direction and have the ability to eat plants, but Allosaurus, Leaping Dragon, and Colorful Wyvern are still pure carnivorous animals, and they cannot digest plant fiber, because their stomachs do not have digestive enzymes to digest starch and other plant components, and they can only digest the nutrients in meat.

Therefore, if you want to imitate human ancestors and start to develop planting technology to meet the huge food consumption of Yuyi, you can only take another way, that is, captive animals, and human pigs, cattle, sheep, chickens and other poultry, the most common food consumed by the dragon herd, large-scale breeding, so that the food of the dragon herd can be multiplied in large quantities within a controllable range, which will be faster and better than the reproduction of food in the wild state, and the number will be more and more huge.

This method is a more suitable plan at this time, as long as the basic breeding technology is mastered, the prey can be reproduced in large numbers in the captive area, but Zhang Jun understands that there is a very important link in the breeding technology, that is, the injection of disease vaccines.

In today's era, this can not be done at all, so once the food is contagious, it can only be destroyed in time, there is no other way to control the spread of the disease, if there is a large-scale plague, just like the sudden outbreak of drought in human society, resulting in no harvest of plant particles, so that a large number of humans are starved to death, that is, dinosaurs will also die of hunger.

In the state of backward production technology, Zhang Jun is helpless, this kind of thing is unavoidable, it will definitely lead to the spread of hunger, and it may also be the same as human society, there will be social unrest and war caused by food.

But it's better to watch these possible future events happen than to watch those bison go extinct, and overall the benefits of captivity far outweigh the disadvantages.

After thinking of this link, Zhang Jun has already begun to prepare, he is ready to control the number of hunts at a certain small scale, so as to ensure the integrity and ecological balance of the attached biological chain, and use breeding technology to captive animals to solve most of the food needs.

Zhang Jun, who is well-fed and well-fed, is not as carefree as the descendants around him, they are all masters who eat the last meal regardless of the next meal, sometimes the food is not enough, under the guidance of the flying dragon, they will run hundreds of kilometers to hunt, and in the long run, they must run farther to find enough food, so the dragon group must migrate to central Africa, but after arriving in the central part of the country, the amount of food is basically fixed, one day, when the number of dragons rises to a certain size, the food will be eaten up, and then between the dragons, Only war can be relied on to seize the necessary food, thus reducing their numbers again to a certain small size.

One of the differences between civilized and barbaric societies is that intelligent beings live in groups, and they work in fixed areas to form a fixed circle of life, unlike the wild beasts, which migrate several times a year, or like nomads, who migrate to different places according to the seasons.

After Zhang Jun had eaten enough, he thought about the food problem again, and he planned to start trying to breed in captivity recently, so that the dragons could find suitable areas and raise the animals they needed in captivity to form a large-scale, large-area breeding area, at least three times the amount of food, so that the number of dragons could continue to expand.

After the food is protected in the captive area, they can be prevented from being hunted by other carnivores to the greatest extent, wild wolves, hyenas, lions, leopards and other carnivorous animals will often haunt, the dragon group wants to expand the population, must be ruthless to these animals, let them be extinct in the nearby area, so that the dragon group is almost the only medium-sized carnivorous animal, so as to ensure that all animal and plant resources are exclusively enjoyed by the dinosaurs.

After the long-term plan was formulated, Zhang Jun began to send tasks to various sub-divisions, and soon after, he could see teams of flying dragons and flying dragons inspecting various places, and they were selecting suitable terrain for Zhang Jun to breed various types of animals.

The bison herd's favorite is the savannah, they like to graze, so there are a few rich grasslands chosen, but those bison are huge, and in order to keep them in captivity, they must have a strong enough fence, otherwise they can easily break through the barrier and escape.

The task of making a fence for bison can only be completed by a large Allosaurus, because the fence that can trap the bison must be very strong, and it is also necessary to make some cattle pens that can shelter the bison from the wind and rain, so that they have a place to shelter from the sun and rain, so the amount of work to keep bison in captivity is very huge.

If a square kilometer of grassland is enclosed and bison are raised, it is necessary to make a fence several kilometers long, and there are many cattle pens, and the weeds on the meadow will be eaten quickly, and the weeds must be collected manually to feed the bison, so as to ensure that the herd reaches a certain number.

If you only rely on natural weeds to breed bison, the number of bison cannot meet the needs of the dragon herd, so the captive task is very heavy, requiring a lot of dinosaurs to act as farm employees, including cleaning cow dung, collecting weeds and other tasks are very heavy.

In addition, there is also a need for the maintenance and maintenance of the cattle pen, and there is also a need for security guards, responsible for driving away or exterminating other carnivores, after the formation of a captive area, a small society will be immediately generated, the social division of labor will be much more complex than the primitive tribal civilization, dinosaurs will perform their duties, and jointly complete the breeding task, which has pushed civilization forward a big step.

Therefore, according to the calculation of the amount of work, the completion of the construction of these farms is not a matter of one or two days, which requires a lot of manpower and material resources, and it takes a long time to slowly form a certain scale.

Nanxiong people quickly chose a suitable area for captivity in a grassland in the south, where there is a large grassland, the grassland is surrounded by mountains on three sides, only one side has a gap, if there are bison and other animals in captivity, a certain amount of work can be saved, as long as a fence is used to block a direction, of course, some mountains need to be manually excavated, a certain degree of construction is carried out, in order to prevent bison from climbing up the mountain.

It is a small valley with a diameter of about 500 meters, and it is usually a paradise for some herbivorous animals, and it is also a place where dragons have hunted before, and it is a frequent haunt of cattle, sheep, deer, horses and other animals.

After Nanxiong found here, he took Zhang Jun and several ancestors to this area to inspect in person, Zhang Jun selected according to the recently developed areas, and finally chose this relatively broad grassland as a pilot area for dragon breeding.

In the previous life, there were many areas that were divided into a certain experimental area, Zhang Jun also felt that it was necessary to build a pilot area here, after all, he had no experience in breeding, and needed to see how the results of artificial breeding were, if it could be successfully captive, it would be promoted in a large area in the future.

This process takes a long time, and all production activities must go through a lot of practical processes in order to master the survival skills that should be mastered, including possible situations and problems, which must be taken into account.

Zhang Jun vaguely remembers that most of the cattle farms in his previous life were built around buildings, and many cattle farms, like pig farms, kept cattle in cement fences, fed indoors in large canopies, and occasionally released bison to eat weeds, which had a series of modern pools, manure cleaning systems, air conditioning, lighting, grass troughs, blowers, medical treatment, etc.

However, the current production conditions simply cannot meet so many needs, only a small part of them can be satisfied, and there are many areas that need to be further explored.