The artificial reproduction of crocodile should be done by the management of the pro-crocodile, the collection and hatching of alligator eggs, and the cultivation of young crocodile.
As a pro-crocodile for breeding, the female and male body should try to select individuals with a relatively long genetic distance. The crocodile pool should be located in a secluded area of ​​the farm as far as possible, using a half-slope half-edge pond and brick walls. Half of the slope should be overgrown with weeds, suitable for female crocodile nesting and spawning. If the weeds are not enough, some of them should be put in by hand so that the female crocodile has enough nests to avoid competition and prevent spawning. The ratio of male and female crocodile should be 3-4:1. The stocking density of the entire pond should not be too high, because when the pro-crocodile together estrus, chase and mating, the activity is greater, the water depth should be maintained more than 1 meter to meet the requirements of its underwater mating. During the first phase of mating, due to the need for gonad development, the amount of bait should be appropriately increased, and several combinations should be made, such as fish, pork, live chicken, duck, and hare. When spawning, the crocodile eats less, feeding can be reduced appropriately. However, after the eggs have been produced, due to the need to restore the body, they will be heavily foraging, so the feeding should be increased. The Chinese alligator is ferocious, and the female crocodile in the breeding period has a large belly and is inconvenient to move and should reduce its interference with it. Therefore, during the spawning period, do not capture the pro-crocodile to check for spawning or not. You can estimate the spawning status by observing the number of nests and eggs on the island.
Eggs in the spawning area should be collected in time. The alligator has a strong egg-keeping habit. Therefore, when spawning, attention should be paid to a few people cooperating with each other. One person picks up the eggs. The others use sticks and fishing masks to drive the crocodile. When collecting eggs, use pre-made egg collection boxes to place eggs. Pay special attention to the placement of the eggs to be close to the natural spawning position. Animals should be upright and cannot be rotated freely, otherwise they will affect the hatching of alligator eggs. The exact timing of egg collection is inconclusive, and it is generally believed that after egg production, it should be collected in a timely manner to prevent the destruction of other egg spawning crocodile. It has also been reported that premature egg harvesting will affect embryonic development and reduce hatching rate. The collected eggs should be checked one by one, pay attention to check whether fertilization, deformity, and whether the shell is complete, and then number them into the incubator for hatching.
The hatching of alligator eggs should take full account of temperature and humidity. The design of the incubator room should be preceded by insulation and heating equipment that will allow temperature control so that the room temperature is not affected by changes in outside air temperature. Indoor water storage tanks should be built to make the water temperature close to room temperature, and special attention should be paid to not spray cold water on the crocodile eggs in order to increase the humidity. This will cause the embryonic development to stop. The wall of the pond and the ground should be smooth. Pay attention to cleaning. Do not put any other debris in the room except the incubator. In order to make full use of the space, a multi-layered incubator can be placed. Incubator boxes can be used plastic boxes, cement boxes can also be used, can also be bamboo, try not to use wooden boxes, iron boxes and other metal material boxes. At the bottom of the incubator, there should be ventilation eyes. When hatching, first nest the material on the bottom of the box, or semi-dry ferns and mosses, then place 1 to 2 layers of crocodile eggs, and then cover the nest. Maintain a constant temperature of 30°C-32°C inside the room. Be careful not to drop below 28°C and not above 32°C. Spray water frequently to keep the nest wet. Indoor air should be a little dredge because oxygen is needed during embryonic development.
In the hatching process, the alligator eggs should be inspected constantly, and it is necessary to remove the crocodile eggs in a timely manner, and to prevent mildew and rupture. Check the eggs gently and gently, and periodically spray the material with drugs. Prevent the growth of mold and other bacteria. When the shells are about to be hatched, the color of the shell of the crocodile eggs will darken. Before the hatching, the young crocodile has sounded and can break the hard shell and break free. When artificially hatched, it was found that the young crocodile was about to hatch and it could be helped artificially. Just out of the young crocodile, there is a gap in the abdomen, connecting a few centimeters long umbilical cord. The other end of the umbilical cord is attached to the eggshell and is generally free to break loose. It is also possible to manually cut the umbilical cord. Newly hatched juveniles have a higher mortality rate before the first instar.
Young crocodilians that have just hatched within 1 week do not need to be fed and are yolk-nutrient. Place them in a terrarium that is similar to the hatchery environment. The terrarium is generally made of cement and is 40 cm to 50 cm in height, 40 cm to 50 cm in width, and 1 m in length. It is divided into water areas and land areas covered with mud sand. Put about 10 containers per box. Young crocodile can move freely in the water tank. Small fish and small meat pieces can be fed in the box. Every day should be cleaned inside the box. Young crocodile is very bulimia, should control the amount of feeding. After a month of cultivation, the weather turns cold. At this time, the temperature of the cultivation room should be raised and the growth period should be extended because it is difficult for the young crocodilians that are too young to go through the winter. After a period of feeding, the individual size of young crocodile will be different, it should be aquaculture. When culturing to a tail weight of about 40 grams, winter can be arranged around mid-December. During the winter, it is stopped 2 days to 3 days in advance, so that the food in the stomach and intestines is completely digested and absorbed, and then the temperature is gradually lowered until about 10°C. This temperature must be maintained throughout the wintering period and cannot be overstated. The young crocodile entering hibernation is already in a coma, not eating or exercising, and breathing is very weak. At this time, special watchers should be arranged to prevent pests and rodents. It can be wintered in the breeding room, and a special underground wintering room can also be built. During wintering season, care should be taken to keep the wintering room quiet and prevent young crocodile from being disturbed. When the next year comes to an end, it can be put into a semi-natural young crocodile breeding pond for breeding. In the winter of the second year, winter can be spent outdoors.
As a pro-crocodile for breeding, the female and male body should try to select individuals with a relatively long genetic distance. The crocodile pool should be located in a secluded area of ​​the farm as far as possible, using a half-slope half-edge pond and brick walls. Half of the slope should be overgrown with weeds, suitable for female crocodile nesting and spawning. If the weeds are not enough, some of them should be put in by hand so that the female crocodile has enough nests to avoid competition and prevent spawning. The ratio of male and female crocodile should be 3-4:1. The stocking density of the entire pond should not be too high, because when the pro-crocodile together estrus, chase and mating, the activity is greater, the water depth should be maintained more than 1 meter to meet the requirements of its underwater mating. During the first phase of mating, due to the need for gonad development, the amount of bait should be appropriately increased, and several combinations should be made, such as fish, pork, live chicken, duck, and hare. When spawning, the crocodile eats less, feeding can be reduced appropriately. However, after the eggs have been produced, due to the need to restore the body, they will be heavily foraging, so the feeding should be increased. The Chinese alligator is ferocious, and the female crocodile in the breeding period has a large belly and is inconvenient to move and should reduce its interference with it. Therefore, during the spawning period, do not capture the pro-crocodile to check for spawning or not. You can estimate the spawning status by observing the number of nests and eggs on the island.
Eggs in the spawning area should be collected in time. The alligator has a strong egg-keeping habit. Therefore, when spawning, attention should be paid to a few people cooperating with each other. One person picks up the eggs. The others use sticks and fishing masks to drive the crocodile. When collecting eggs, use pre-made egg collection boxes to place eggs. Pay special attention to the placement of the eggs to be close to the natural spawning position. Animals should be upright and cannot be rotated freely, otherwise they will affect the hatching of alligator eggs. The exact timing of egg collection is inconclusive, and it is generally believed that after egg production, it should be collected in a timely manner to prevent the destruction of other egg spawning crocodile. It has also been reported that premature egg harvesting will affect embryonic development and reduce hatching rate. The collected eggs should be checked one by one, pay attention to check whether fertilization, deformity, and whether the shell is complete, and then number them into the incubator for hatching.
The hatching of alligator eggs should take full account of temperature and humidity. The design of the incubator room should be preceded by insulation and heating equipment that will allow temperature control so that the room temperature is not affected by changes in outside air temperature. Indoor water storage tanks should be built to make the water temperature close to room temperature, and special attention should be paid to not spray cold water on the crocodile eggs in order to increase the humidity. This will cause the embryonic development to stop. The wall of the pond and the ground should be smooth. Pay attention to cleaning. Do not put any other debris in the room except the incubator. In order to make full use of the space, a multi-layered incubator can be placed. Incubator boxes can be used plastic boxes, cement boxes can also be used, can also be bamboo, try not to use wooden boxes, iron boxes and other metal material boxes. At the bottom of the incubator, there should be ventilation eyes. When hatching, first nest the material on the bottom of the box, or semi-dry ferns and mosses, then place 1 to 2 layers of crocodile eggs, and then cover the nest. Maintain a constant temperature of 30°C-32°C inside the room. Be careful not to drop below 28°C and not above 32°C. Spray water frequently to keep the nest wet. Indoor air should be a little dredge because oxygen is needed during embryonic development.
In the hatching process, the alligator eggs should be inspected constantly, and it is necessary to remove the crocodile eggs in a timely manner, and to prevent mildew and rupture. Check the eggs gently and gently, and periodically spray the material with drugs. Prevent the growth of mold and other bacteria. When the shells are about to be hatched, the color of the shell of the crocodile eggs will darken. Before the hatching, the young crocodile has sounded and can break the hard shell and break free. When artificially hatched, it was found that the young crocodile was about to hatch and it could be helped artificially. Just out of the young crocodile, there is a gap in the abdomen, connecting a few centimeters long umbilical cord. The other end of the umbilical cord is attached to the eggshell and is generally free to break loose. It is also possible to manually cut the umbilical cord. Newly hatched juveniles have a higher mortality rate before the first instar.
Young crocodilians that have just hatched within 1 week do not need to be fed and are yolk-nutrient. Place them in a terrarium that is similar to the hatchery environment. The terrarium is generally made of cement and is 40 cm to 50 cm in height, 40 cm to 50 cm in width, and 1 m in length. It is divided into water areas and land areas covered with mud sand. Put about 10 containers per box. Young crocodile can move freely in the water tank. Small fish and small meat pieces can be fed in the box. Every day should be cleaned inside the box. Young crocodile is very bulimia, should control the amount of feeding. After a month of cultivation, the weather turns cold. At this time, the temperature of the cultivation room should be raised and the growth period should be extended because it is difficult for the young crocodilians that are too young to go through the winter. After a period of feeding, the individual size of young crocodile will be different, it should be aquaculture. When culturing to a tail weight of about 40 grams, winter can be arranged around mid-December. During the winter, it is stopped 2 days to 3 days in advance, so that the food in the stomach and intestines is completely digested and absorbed, and then the temperature is gradually lowered until about 10°C. This temperature must be maintained throughout the wintering period and cannot be overstated. The young crocodile entering hibernation is already in a coma, not eating or exercising, and breathing is very weak. At this time, special watchers should be arranged to prevent pests and rodents. It can be wintered in the breeding room, and a special underground wintering room can also be built. During wintering season, care should be taken to keep the wintering room quiet and prevent young crocodile from being disturbed. When the next year comes to an end, it can be put into a semi-natural young crocodile breeding pond for breeding. In the winter of the second year, winter can be spent outdoors.
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