CATDOLL : CATDOLL: What are the factors that affect the survival rate of baby rabbits?

1. What are the factors that affect the survival rate of young rabbits?

Hello, my name is Qing Gege. More and more people are raising rabbits, so let me answer this question!

Survival rate is an issue that the breeding industry must pay attention to, because it is related to the direct economic benefits of breeding. Since the bodies of young rabbits have not yet matured, their resistance is weaker than that of adults. Rabbits at this stage are also more susceptible to diseases. So how to improve the survival rate from a technical level?

The factors that affect the survival rate of young rabbits are mainly as follows:

1. When young rabbits are weaned, they are in poor physical condition, malnourished, and have weak disease resistance. If other supporting measures are not taken, they are easily infected with diseases and die.

2. Irrational diets. A few farmers pursue rapid growth of young rabbits and blindly prepare high-energy, high-protein diets, which have the opposite effect, causing a large number of young rabbits to die from diseases such as Clostridium perfringens. Some farmers still use traditional feeding methods after introducing improved breeds, feeding only grass, or simply preparing diets that do not meet nutritional requirements, resulting in malnutrition and weakness of young rabbits.

3. Improper feeding. Many farmers have a strict feeding system, but do not feed rabbits at regular times and in irregular quantities, which causes the rabbits to be hungry or full at irregular times, overeat, and cause digestive diseases such as indigestion.

4. The epidemic prevention system is not sound. Some farmers lack the concept of epidemic prevention, do not inject or inject vaccines or bacteria in time, and ignore the prevention of coccidiosis in summer and autumn.

5. Unfavorable management measures, such as dirty rabbit houses, moisture, and poor ventilation.

There are several ways to improve the survival rate of young rabbits:

1. The weight requirement of young rabbits at weaning. The speed of fattening depends largely on the speed of early weight gain. That is, it is closely related to the fattening period and the lactation period. All rabbits with large weaning weights gain weight faster during the fattening period and are more likely to resist the stress of weaning. The smaller the weaning weight, the more difficult it is to raise after weaning, and the slower the fattening weight gain. This requires improving the lactation ability of the mother rabbit, ensuring the supplementary feed for the young rabbits, and adjusting the weight of the young rabbits and the number of young rabbits the mother rabbit feeds.

2. Pay attention to feed problems. Many young rabbits develop digestive tract diseases after weaning, and the main reason is the feed. Because rabbits grow fast after weaning, but their digestive functions are not yet fully developed, a sharp contradiction is formed. Therefore, it is very important to prepare nutritious, easy to digest, and stress-preventing feed. Premix microecological preparations can be used to adjust the rabbit intestinal flora to reduce the stress response of young rabbits. The quality of feed raw materials must be strictly controlled, and attention must be paid to whether the feed raw materials are moldy.

3. Young rabbits are susceptible to infectious diseases, so we need to do a good job of epidemic prevention. Pay attention to daily disinfection, cleanliness and hygiene to reduce the occurrence of diseases. Onions, garlic and other medicinal plants can be added to the feed, which are good for disease prevention and growth promotion. At the same time, timely vaccination should not be ignored to ensure the safety of the rabbits.

4. Young rabbits have a habit of eating gluttonously, so the amount of food they eat must be limited. Feed them regularly, and reduce or increase the amount of food you feed them next time based on the amount of food left. Young rabbits grow fast and have a large appetite, so you must ensure they drink enough water every day.

The above are the factors that affect the survival rate of young rabbits and the methods to improve the survival rate of young rabbits. I hope it can be helpful to everyone! I wish all the young rabbits you raise can grow up healthily!

2. What are the factors that affect the survival rate of tadpoles during transportation?

The main factors that affect the survival rate of tadpoles are as follows: (1) Water temperature. Bullfrog embryos cannot tolerate low temperatures, but tadpoles can tolerate low temperatures and can survive even when the water temperature drops below 5 degrees, but they cannot adapt to high temperatures. The test results show that when the water temperature reaches 35 degrees, the tadpoles' activity decreases and their food intake decreases. At 37 degrees, there is mild mortality, at 39 degrees, there is severe mortality, and above 40 degrees, all tadpoles will die.

Therefore, during high temperatures, artificial cooling measures must be taken, such as setting up a shade shed above the pond, planting duckweed or water hyacinth in the pond, and frequently filling the pond with new water to regulate water quality and water temperature, which plays a good role in improving the survival rate of tadpoles. (2) Stocking density.

The stocking density of tadpoles of different sizes is different, especially the stocking density of early tadpoles (3-1.4 cm) has a significant impact on the survival rate. When the stocking density of early tadpoles exceeds 1000/m2, the survival rate is significantly reduced. When it reaches 2000 per square meter, the survival rate is only 18%.

(3) Water quality. There are many factors that affect the deterioration of water quality, the main one being the reduction of dissolved oxygen in the water, such as oxygen consumption by organic matter, pollution, and the respiration of biological organisms, including tadpoles, which consume oxygen and produce carbon dioxide. This is the direct cause of the deterioration of water quality. On June 12, 1983, we put 100 tadpoles, 10 days after decapping, into a glass tank filled with 1000 ml of water. Five days later, all of them died. Water quality analysis showed that the dissolved oxygen content was only 3.

8 mg/L (25 degrees). (4) Human disturbance. The survival rate of tadpoles in the original pond after hatching is significantly different from that in the pond transferred after human disturbance.

3. Briefly describe the water ecological factors that affect the overwintering survival of fish?

1. Poor physical condition of fish during the winter: Generally speaking, large-sized fish have good physical condition and high survival rate during the winter. Small-sized fish have poor physical condition and less nutrients such as fat accumulated in their bodies. It is difficult for them to maintain energy for survival during the long wintering period and they often die due to physical weakness. However, if the feed formula is unreasonable, the vitamin content is unbalanced or the amount of growth promoter added exceeds the standard, although it does not affect the growth of the species, it will seriously affect the physical condition of the fish and make the fish "fat". The immunity of such fish decreases and it is difficult to survive the winter. Especially in the late winter, they are susceptible to infection by pathogens, fish diseases break out, and wintering losses occur.

2. Hypoxia and low temperature in subglacial water:

(1) Snow is not cleared in time or the clearing area is too small, resulting in poor light transmittance, which affects the photosynthesis and oxygen production of phytoplankton.

(2) The water is thin and lacks fertilizer, the amount of phytoplankton is small, and the oxygen production is insufficient; the zooplankton reproduces in large numbers, and the oxygen carrying capacity increases.

(3) The bottom mud of old ponds is too thick and the high organic matter content causes hypoxia.

(4) Improper water injection or oxygenation. Blindly flushing water or adding oxygen for a long time will cause the water temperature in the pond to drop rapidly, and the turtles will be frozen to death.

3. Harmful substances exist in the wintering pool: Due to the increase in wintering density, harmful gases cannot escape after ice closure, and accumulate more and more in the water. Once the standard is exceeded for a long time, it will cause harm to the wintering fish. The most easily produced chemicals are ammonia nitrogen, nitrite, hydrogen sulfide and carbon dioxide.

4. Fish overwinter with diseases: Pathogens infected during the summer and autumn breeding stage are not treated in time, and the disease accumulates in the winter. The five species have poor physical fitness and poor ability to resist diseases and adverse environments, which increases the chance of infection with fish diseases and leads to fish disease outbreaks.

4. What are the common fish?

1. Yellow Duck Call

The scientific name of the yellow duck is Pelteobagrus fulvidraco, and it is also known locally as Huang Yagu, Huang Yagu, Huang Yagu, and Huangyajiao. It has tender meat, delicious taste, rich nutrition, no intramuscular bones, and high fat. It is a common edible fish in China and one of the most common fish in rural rivers.

2. Snakehead

Snakehead fish is a fierce fish, also known as mullet, raw fish, wealth fish, snake fish, firehead fish, black snakehead, etc. Its meat is delicious and nutritious, and it is a fish with high economic value. In rural areas, it is generally called wealth fish, which means getting rich.

3. Channa

Channa fish mostly live in lakes and shallow waters, and mainly feed on small fish, shrimps and insects. There are more than 30 species of Channa fish in China, and the common genera include the black Channa fish, the Channa fish, and the sand Channa fish. Especially in spring, Channa fish should be the first river delicacy that can be caught.

4. Carp

Carp is a primary freshwater fish that usually lives on the bottom of water bodies covered with aquatic plants in rivers, lakes, reservoirs and ponds. It is one of the freshwater fish with the most varieties, the widest distribution, the longest breeding history and the highest yield.

5. Grass carp

Among the important freshwater economic fish in China, the most important is grass carp. Grass carp is a fish that is now farmed in many areas. It is also a fish that is often seen in rural rivers and a common fish on people’s tables.

6. Silver Carp

Silver carp is one of the four major carps. Its meat is tender and nutritious. It is a species artificially cultivated in many areas and one of the main freshwater farmed fish in my country. It can often be seen in rural rivers and is deeply loved by people.

7. Crucian carp

There are a lot of crucian carp in rural rivers. Anyone who has ever fished knows that crucian carp is the easiest fish to catch. Generally, when you go out fishing, you can always bring back a basketful of them, and they are also very cheap. This fish is also one of the most common fish on the table.

8. Catfish

Catfish is still very common in rural areas, especially in relatively dirty water. Catfish are relatively large, some weighing 20 to 30 kilograms. They taste good and are rich in nutrients, so many people currently raise them in rural areas.

9. Fish

The silver carp is also called white stripe. This fish can often be caught by the river. This fish cannot live without water and will die if it is away from water for 10 minutes. The silver carp is very common in rural areas. Many people who love fishing often go to rural rivers to fish.

10. Culex

When fishing, you should be afraid of this kind of fish because it can eat up the bait very quickly and you may not be able to catch it. The scientific name of the upturned carp is "upturned carp", and because of its very distinctive mouth, it has many interesting names in the folk, such as upturned carp, carp thorn fish, white fish, pouting carp, pouting mouth, upturned white carp, upturned mouth, etc.

5. What is the largest fish?

The largest fish in the world is the shark, with a large body and cracked teeth

6. What are the characteristics of fish?

There are four main characteristics of fish: they live in water, breathe with gills, swim with fins, and reproduce by laying eggs.

1. Living in water: All fish live in water. Even though some can stay out of water for a short time, they cannot stay out of water for a long time. For example, mudskippers can go ashore to look for food when the tide is low, but they will definitely return to the water before being killed by the sun. The African lungfish stays out of water the longest. During the dry season of the river, they will burrow into the mud and hibernate with a small amount of water until water comes back.

2. Breathing with gills: One of the reasons why fish live in water is that they mainly breathe with gills. Unlike the lungs of terrestrial animals, gills need to be moist to function properly. When water flows through the gill filaments, the blood vessels inside can complete the exchange of oxygen. However, some fish can breathe with the help of other organs, such as loaches can breathe with their intestines, and fish of the family of perch have suprabranchial organs that can obtain oxygen from the air.

3. Swimming with fins: Since fish live in water, they need some means to swim. Fish fins are the helpers of swimming. They are usually divided into five categories, namely pectoral fins, pelvic fins, dorsal fins, anal fins and caudal fins. Some fish also have adipose fins. Different fins have different functions, but they can basically maintain balance. The caudal fin can also provide power and turn, which is particularly important for fish.

4. Reproduction is oviparous: Most fish reproduce by laying eggs, and a few are ovoviviparous. Ovoviviparous looks like viviparous, but it is still oviparous, except that the eggs are not hatched outside, but inside the fish body, so the fish are born small.

7. Shell fish?

Horseshoe crabs are shelled fish on Earth and are marine arthropods. They are crab-like, with a bluish-brown or dark brown body covered with a hard shell. They have four eyes, two of which are compound eyes. There are two small eyes of 0.5 mm at the front of the cephalothorax, which are most sensitive to ultraviolet light and are only used to sense brightness. There is a pair of large compound eyes on both sides of the cephalothorax. Although horseshoe crabs can flap their gills with their backs facing down to propel their bodies to swim, they usually bend their bodies into an arch, burrow into the mud, and then use their tail swords and the last pair of walking legs to propel their bodies forward.

8. A general term for fish?

A general term for cartilaginous fish and bony fish

Alias: fish. It is a cold-blooded aquatic vertebrate that breathes with gills, swims by swinging its tail and trunk and coordinating its fins, and feeds with its upper and lower jaws. It belongs to the subphylum Vertebrata in the phylum Chordata. Generally, people divide vertebrates into five categories: fish (53%), birds (18%), reptiles (12%), mammals (9%), and amphibians (8%). According to statistics by the late Canadian scholar Nelson in 1994, there are 24,618 species of living fish in the world, accounting for more than half of the named vertebrates. New species of fish are constantly being discovered, with an average of about 150 species per year. In more than ten years, more than 1,500 species should have been added. At present, there are about 32,100 named fish species in the world.

Fish are mainly divided into tropical fish, temperate fish and cold-zone fish.

Water fish are divided into: freshwater fish and saltwater fish

9. Harmless fish?

The first choice is herbivorous fish, which are small and safer. In addition, artificially farmed fish are also called edible fish, which are fed with food such as green vegetables, cabbage, fried cornmeal, wheat bran, etc., so they are also safe.

Carnivorous fish have higher mercury levels than herbivorous fish, and marine fish have higher mercury levels than freshwater fish. The older and heavier the fish, the higher the mercury levels.

10. Are whales large fish that children can raise?

1. Red Arowana: Red Arowana is a tropical freshwater fish that is relatively large in size and is well suited for being kept in large aquariums that can provide ample swimming space.

2. Tiger fish: Tiger fish is also a freshwater fish with beautiful black and white stripes on its body. Tiger fish also have a larger body size and are suitable for being kept in a large aquarium.

3. Goldfish: Goldfish is a common ornamental fish. It is large in size and suitable for being kept in a large aquarium. Goldfish are also gentle and easy to keep.

4. Conger Fish: Conger fish is also a tropical freshwater fish. It is large in size and very suitable for being kept in a large aquarium. Conger fish has lively habits and likes to swim in the water, making it very suitable as an ornamental fish.

5. Arowana: Arowana is also a common ornamental fish, cute and easy to raise. Larger Arowana is suitable for raising in large aquariums, and it is relatively simple to raise Arowana, which is very suitable for beginners.

In general, choosing large fish suitable for raising cetacean children requires considering factors such as the size of the aquarium and the difficulty of raising them to ensure that the large fish can fully grow and develop while ensuring the safety and health of the cetacean children.