The world's first cloned dog was born.
South Korean scientist Hwang Woo-suk revealed in the recent publication of the journal Nature that his team has successfully bred the world's first cloned dog, Snape.
Dog cloning has always been a difficulty in the field of cloning technology. the reason is that dogs only have two estrus a year, and waiting for dogs to ovulate naturally is the only way to get their eggs. On the other hand, when the dog ovulates, the ovary is in the early stage of development and finally matures at the end of the fallopian tube, so it is very difficult to successfully extract high-quality dog eggs.
Cloning dogs is of great value in medical research, because pathologically, dogs are very close to humans. There are 203 disease models in dogs, compared with 65 in pigs and 123 in cats.
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Canine rheumatism
Rheumatism is an acute or chronic non-suppurative inflammation that often occurs repeatedly, with muscles, joints and heart as its frequent sites. Dogs have more hair. The cause of rheumatism is not clear. But it is now considered to be an autoimmune disease. That is, the hemolytic streptococcus invading the diseased dog can make the body produce the corresponding antibody. When there is some inducement to make the streptococcus re-invade the body, the invading streptococcus, as an antigenic substance, combines with the anti-streptococcal antibody present in the body to form the antigen-
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Snake feed and its preparation
The animal food eaten by various snakes must be related to the environment in which they live, which is related to the geographical distribution of small animals. For example, snakes on land eat a wide range of food, such as earthworms, insects and their larvae, fish, frogs, snakes, lizards, birds, rabbits, and so on, while snakes living in the sea feed on marine fish. Even if the same kind of snake is in different regions and in different seasons, the eating habits of adults and larvae are different. Artificial raising of snakes to provide rich food is the key to raising snakes well. The food of wide-eating snakes should be diversified, so it should be put on a regular basis.
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