CATDOLL : CATDOLL: Frog breeding technology?

1. Frog breeding technology?

At present, frog farming is a hot topic in the market. In the past few years, American frog farming was hyped. Due to the emergence of feed, the price of American frogs has fallen to a low point. In large supermarkets, the price of American frogs has even reached an ultra-low price of 5 yuan per catty. The cost of feed is now about 8,000 yuan per ton (Chengdu Haida Feed). Excluding labor costs, site infrastructure costs are 6,000-7,000 yuan/mu, and seedlings are 4,000-5,000 yuan/mu. The yield of bullfrog per mu is only about 2,000-3,000 catties, 3,000 catties x 5 yuan/catty = 15,000 yuan, which means there is almost no profit in the first year after deducting costs. The yield of frogs per mu is only about 1,000 catties. Some people who hype frog seedlings say that their frogs are raised with all feed and can reach about 2,000 catties. To be honest, they are all fooling people. Frogs 2,000 catties/mu x 30 yuan/catty = 600 million/mu, on the surface the profit is very considerable, but who can really raise 2000 jin/mu of frogs? Many people have visited major frog farms, including myself. If you don't inquire and observe carefully, it is difficult to see the tricks. Many farms are basically |: When you go to see it, it looks very large. There are probably many frogs in a pond, even tens of thousands, but there are no frogs in some ponds. Do you know the tricks? They gather frogs from many ponds into (concentrate) a few ponds. Many people have visited and feel very good. They all think that the yield of frogs is very high. Then the owner of the farm will tell you that this is a frog raised by their unique technology. Only he has this technology. Others can't raise frogs with such a high yield. Then you will arouse your interest and ask him about the seedlings. He said that my tadpoles are 400-500 yuan/10,000 seedlings and the frogs are 200 yuan/right. Do you know how considerable the profit is? As long as you buy tadpole seedlings from me, I will teach you the technology for free. If you don't buy tadpole seedlings from me, you will have to pay a technical training fee of about 3,000 yuan. So please pay attention. Now 99% of the frog farmers are basically unsuccessful, and they have transformed themselves into selling tadpole seedlings, breeding frogs and making money from technology transfer training fees. Frog breeding is a kind of hype. If you visit some farms, you can't even see commercial frogs in the pond. Hundreds or thousands of frogs are kept for breeding. If you want to raise frogs, please consider it carefully. Investment is risky. Please invest with caution. I am just a nosy agricultural technician, so I don't want to see any of my colleagues being deceived.

How do frogs mate?

Frog mating method

Spring is the reproductive season for frogs. Every April night, the fields outside the city are filled with the sound of frogs croaking. But the only frogs that join the chorus are male frogs. They sing so vigorously to call their own kind, and this is the prelude to mating. The female frog will jump towards the male frog that is croaking loudly. When she arrives in front of the male frog, after staring at each other for a moment, the male frog will jump on the back of the female frog. Then, the female frog carries the male frog on her back and crawls into the shallow water of the rice field to lay eggs and fertilize. This special behavior is called "mating" in biology.

Frogs' mating is not mating, but just a part of the reproductive process. Studies have shown that if male and female frogs are artificially separated (i.e., there is no mating process), then even in the frog's breeding season, the female frog cannot ovulate. It can be seen that the biological significance of mating is that it can induce female frogs to ovulate. Generally, frogs lay eggs and fertilize them in water. After the eggs hatch, they become tadpoles and live in the water. Then they become young frogs and land on the water.

The phenomenon of pair hugging is an indispensable reproductive behavior of frogs and toads before laying eggs. Once the male catches the female, the singing stops abruptly, and he hugs the female's armpits tightly with his forelimbs and crouches on her back. Its biological significance is obviously closely related to stimulating the synchronous ejaculation and egg laying of both sexes and improving the fertilization rate.

At the turn of spring and summer, in the grass near the water, you can often see male frogs in their reproductive period lying on the body of female frogs and hugging them tightly with their forelimbs. This phenomenon is called hugging. At the base of the thumb of the male frog's forelimb, there is a brown-black swelling, called a nuptial tumor, which is used for hugging. Frog eggs are fertilized in vitro, and hugging is the behavior of frogs when they lay eggs and ejaculate. When hugging, the cloacae (the common cavity where the digestive tract, ureter and reproductive tract of an animal body open together) of male and female frogs are close to each other, which is conducive to the direct discharge of semen on the eggs, which will increase the fertilization rate of the eggs and increase the chance of sperm and egg combination.

Go and look through the biology textbook for the second year of junior high school, there are pictures and the truth. Generally speaking, it is in the water, the female makes a sound to attract the male, the male climbs on the female, mates, you know, then lays eggs, the male lays sperm, they combine together, sink to the bottom of the water, and finally evolve into tadpoles.

At the turn of spring and summer, in the grass near the water, you can often see male frogs that have entered the reproductive period lying on the body of female frogs, holding the female frogs tightly with their forelimbs. This phenomenon is called pair hugging.

At the base of the thumb of the male frog's forelimb, there is a brown-black swelling, called a nuptial tumor, which is used for cuddling. Frog eggs are fertilized in vitro, and cuddling is the behavior of frogs when they lay eggs and ejaculate. When cuddling, the cloacae (the common cavity where the digestive tract, ureter and reproductive tract of an animal body open together) of the male and female frogs are close to each other, which is conducive to the direct discharge of semen on the eggs, thus increasing the fertilization rate of the eggs. The smaller one is the male frog, on top, and the larger one is the female frog, on the bottom. When cuddling, the squeezing of the male frog is also conducive to the ovulation of the female frog, so that ovulation and ejaculation can be carried out simultaneously.

The male is riding on the female, PP to PP. Answered by: zhoulin8812 |

It seems like this

Male riding female's top PP to PP

3. What are the breeding techniques for forest frogs?

The egg-laying method of forest frog reproduction

There is a big difference between artificially constructed spawning grounds and natural spawning grounds, and the density of artificially bred frogs is high. Forest frogs are unwilling to lay eggs in spawning grounds, so they must be forced to lay eggs in spawning grounds under artificial control. The spawning methods include cage spawning method and circle spawning method.

Ring spawning

Surround the spawning pond with plastic film or wire mesh. The plastic film or wire mesh should be 1-1.5 meters high, tilted inward at an angle of 45-60 degrees, or folded inward at a right angle at the upper end, and compacted with soil at the lower end. Release breeding frogs at a ratio of 1:1 between male and female, with a density of 10-15 pairs per square meter. In order to increase the speed of pairing, about 10-20% of male frogs can be added. After spawning, the egg mass and breeding frogs should also be transferred in time. If the spawning pond, hatching pond, and feeding pond are built according to unified standards, the entire breeding field can be enclosed for easy management, which is extremely convenient and feasible.

Cage spawning

Use thin wire or branches to weave a cage, put good frogs in it at a ratio of 1:1 between male and female, and then put the cage in the spawning pool, and adjust the water depth appropriately to keep the water depth in the cage at about 15 cm. The spawning cage should be placed in a still water area, away from the water outlet and inlet. After the frogs are paired, they can lay eggs in 7-8 hours when the water temperature is around 10℃. Pay attention to accurately grasp the time, transfer the frog eggs to the hatching pool in time, and take out the frogs after laying eggs and send them to the dormancy site. If the spawning pool, hatching pool, and feeding pool are built according to the same standard, several pools in the middle and upper reaches can be selected as spawning pools.

Practice has shown that the natural incubation method is better. Natural incubation is the incubation of frog eggs by natural water temperature, which is basically similar to the natural wild frog incubation method, that is, placing eggs in the incubator at a number of 15 per square meter and allowing them to hatch and grow naturally.

Several issues should be noted during the hatching process: First, during hatching, the egg mass should be placed in shallow water and moved to deep water after the egg mass expands. If it is placed directly in deep water, the egg mass will not expand, its buoyancy is low and it is easy to sink to the bottom and become contaminated. In addition, the water temperature in deep water is low, the hatching speed is slow, and the frog eggs are easily damaged.

Second, in the early stage of incubation, water should be poured in and out from the same side and in a closed (semi-closed) manner to maintain the stability of the water surface and the water temperature. The water depth in the pool is about 20 cm to 30 cm, and it should be covered at night due to the low temperature.

Third, we should pay attention to prevent the egg mass from being contaminated by mud. We can build small squares on the surface of the pond with wormwood straw, branches, etc. to control the egg mass in a certain area and prevent it from floating to the edge of the pond and being contaminated.

Fourth, we must pay attention to preventing invasion by natural enemies and expel poultry in a timely manner, especially natural enemies such as ducks and frogs.

Fifth, during the incubation period, pay attention to maintaining a quiet environment, avoid vibrating the pool embankment, and do not stir the water in the incubation pool.

Sixth, the water temperature during the incubation period should be controlled at around 10-15℃. The results of expert experimental research show that the proportion of female frogs can be increased by 20-30% at this water temperature.

You should choose a suitable environment. Generally, the environment is relatively humid, and there will be some trees around. They will lay eggs in April. You can choose to collect them, but you cannot use drugs. When selecting, you should choose some relatively strong ones weighing about 50 grams and put them in the pool. The water temperature should be controlled at around 10℃.

An appropriate breeding environment should be selected, and attention should be paid to economic benefits, the spawning process, feed feeding, and variety selection.