There are many differences in dna among different kinds of dogs.
Researchers in the first issue of the journal Science point out that genetic differences between different breeds of dogs are so obvious that they can even judge a dog's species by its DNA alone. This phenomenon is related to the fact that humans have controlled the inbred breeding of dogs over the past 300 years to acquire the characteristics of different dogs. This shows that human beings can indeed play an important role in the field of species evolution.
In an analysis of the DNA genetic code of dogs in an attempt to further understand the genetic factors of human disease, researchers were surprised to find that genetic differences between different breeds of dogs have reached 30 per cent in just the past few hundred years. Far greater than the differences between different races of human beings.
Many dogs can be divided into 4 main categories and 85 breeds according to their genetic characteristics. These include ancient breeds such as huskies and Peking pugs, which may be closest to their wolf ancestors; Labrador hounds; large domesticated dogs such as Rottweilers; shepherds, guard dogs and other herding dogs.
The researchers say most varieties have traces of human creation. Although all dogs belong to the same species, there are great differences in appearance and behavior habits among different breeds of dogs, such as weight, size, shape of head, fur, ear shape, behavior and disease. There are so many small differences between different species within a single species that do not exist in other species. In fact, there are more than 400 species of dogs in the world, each of which is an independent breeding population.
Over the past 300 years, humans have concentrated and systematically bred dogs to get the characteristics they want. The production of such a large number of small genetic differences in such a short period of time is entirely the result of human action.
- Prev
Beware of fox raccoon lice mite disease in autumn and winter
In the current season, the breeding of fur animals is entering the fur growth period. in addition to meeting all kinds of nutrients needed for fur growth, special attention should be paid to the occurrence of parasitic diseases in vitro. There are 100000 raccoon dogs in Zhaoyuan Farm, which has rich experience in the prevention and treatment of lice acariasis. Now the points for attention are introduced as follows: pay attention to observe that skin diseases such as lice acariasis do great harm to fur animal breeding. Should cause the broad masses of farm farmers to pay enough attention, especially in the current winter hair growing season, inspection and prevention of acariasis is a work that can not be ignored before peeling.
- Next
Cold and treatment of dogs
[etiology] the main reason is that it is affected by cold, especially when the feeding management is not appropriate, it is more likely to occur. For example, sleeping on a cold night, lying in a cool place for a long time, attacking by thieves, being stimulated by cold water after sweating or tears wading across the river, and long-term feeding in a cold and humid environment can reduce the mucosal resistance of the upper respiratory tract and promote the occurrence of the disease. [diagnostic points] the sick dog was depressed in spirit, indifferent in expression, irregular in skin temperature, cold at the tip of the ear and nose. Conjunctival flushing or mild swelling, tears, elevated body temperature
Related
- On the eggshell is a badge full of pride. British Poultry Egg Market and Consumer observation
- British study: 72% of Britons are willing to buy native eggs raised by insects
- Guidelines for friendly egg production revised the increase of space in chicken sheds can not be forced to change feathers and lay eggs.
- Risk of delay in customs clearance Australia suspends lobster exports to China
- Pig semen-the Vector of virus Transmission (4)
- Pig semen-the Vector of virus Transmission (3)
- Five common causes of difficult control of classical swine fever in clinic and their countermeasures
- Foot-and-mouth disease is the most effective way to prevent it!
- PED is the number one killer of piglets and has to be guarded against in autumn and winter.
- What is "yellow fat pig"? Have you ever heard the pig collector talk about "yellow fat pig"?