| If you take a close look at dogs and their owners the old saying that
they are alike is actually right in 3 out of 10 pairs. So says the
statistics of the recent study conducted by professor Nicholas Christenfeld
of the University of California. Christenfeld took a random sample of
the dogs and their owners and took pictures of them to study the
visual similarities and behavioral patterns. Strong facial feature similarities was found in
three out of ten cases. In other words dogs do look like their owners
almost in every third household which keeps these four legged friends.
Why does this happen, and specifically how does this happen. The
process has to do with psychology of picking up pets, especially dogs
by the future owners. When a person looks at mutts, he is naturally
drawn to those that resemble him in the looks or behavior. When they
live together these similarities tend to grow bigger as they pick up
the behavioral patterns from each other. Dogs, like children begin to
resemble their owners in their behavior. Visual trait similarities (especially
hair style) often remain and even increase through the years. The
research study at the University of California even conducted an
experiment. The photos of dogs and their owners were separated and
given to panel people who were asked to possibly match back pairs of
owners and their dogs. The results were amazing - in over sixty
percent of cases the pairs were matched correctly. Such high
statistical figure shows that similar visual traits do play a vital
role in pet choosing, and it's especially true with the dogs - animals
which are closer to humans than any other pets. Dogs are also shown to
have a higher intelligence than any other household pets. Christenfeld
suggest that psychology plays a vital role in the choice of a mutt.
Humans are naturally drawn to animals that resemble them either with
visual traits or in behavior.
Agricultural animals:
Not all the animals are equally domesticated. Agricultural animals are the most domesticated ones. They have highly developed ability for adapting (with the help of man) to various external conditions. For example, they can tolerate extremely cold and hot conditions and eat not only the forages, which are available in nature, but also the ones that are prepared artificially. Such properties are possessed by cow, sheep, horse and pig, and consequently they merged in the household. But there are also like buffalo, camel, reindeer, llama, paca or alpaca, which live only in particular regions - in very cold, or in hot regions of Asia and Africa or on high mountains of Peru.
Pets are beneficial to humans. Supporters of the movement for the rights of animals think that the man must not kill animals for meat and skin. Most hard-line vegetarians abstain even from milk and eggs. Pets are the source of foodstuffs (milk, oil, cheese and other dairy products, and also meat, fat). Others are reared for making clothes, shoes. Some carry load and carry out the agricultural works. Sometimes animals are kept for pleasure, for example, some birds. However many birds are reared for getting useful products (meat, eggs, feathers, fur). House insects are reared for obtaining useful products. Bees produce honey, and silkworms are reared for raw materials for silk.
Selective Breeding
Main feature of pets which is used by the selective breeders is the variety of their qualities. This is used for raising various breeds. Thanks to the laborious selection work, in the last two centuries some original animals have been transformed beyond recognition. Examples are brachycerous cow, Leicester and Southdown sheep, English racer and carthorse, and at last, Yorkshire and Berkshire breeds of pigs. These changes in the organism of animals and fixation of desirable heredity became possible because of the very long work, carried out by many generations of breeders.
If we take the original animal and put it near to the developed animal, then the results of breeding often seem just impossible. English bull weighs upto 50 to 70 poods. Russian country sheep weighs 50 - 60 pounds, sheep of Southdown breed is fattened upto 400-600 pounds, yes besides this it gives 10-15 pounds of fine long wool. English pigs in one year reach the weight of 10-12 poods (for comparison, Russian pig has to be raised for 3-4 years so as to attain this weight). Nothing more can be said about English racers and carthorse, they are very popular in the world since long.
An interesting example of changes in the features of pets depending upon the requirement of man is the merino sheep. Breeding of its hair-coat covering was determined by the changes in demand for different types of wool. In the last decades, sheep breeders have tried to change the length, fineness and other characteristics of merino wool.
At present selective breeders want to develop such breeds which could be useful in different ways. For example, in large horned livestock, they are trying to combine milking with the ability to fattening, and in sheep – production of good wool with meat.
Works of Blackwell and Collins brothers have shown that by means of selection breeding, it is possible to get desirable changes in the attributes of pets, and it is just a guess, whether there is any limit to these changes.
Darwin in his world famous composition “On the Origin of Species” has repeatedly referred to achievements of cattlemen in deducing new breeds of livestock. Entire chapter 1 of the book is devoted towards changes, which animals and plants undergo during their breeding process. |
It has been said that people buy pets that look like they do. I have proof of this. I saw Rosie O'Donnell walking her gorilla just yesterday.
