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The complexity of breeding

Today's Kuril Bobtail different from native species by larger size. In nature, usually seals reach a size of 3,5-4 kg, females 2-2,5 kg, and animals are grown in urban nurseries with 2.3 pedigree easily step over threshold 5-6 kg (3-4 kg for cats ). Begins to flatten out the difference in size between males and females, typical of many native breeds.
Unfortunately, the small size of the original population has led to unreasonably high degree of inbreeding of some bloodlines that are known not only leads to the consolidation of articles ancestor, which has been inbreeding, but also "pulls" from the genotype of the ancestor, both positive and negative genetic features. This is evident from a shortening of the length of the tail. Known for a lot of births is almost (1 vertebrae of the tail) and absolutely tailless individuals.
Also strong enough changes have been wool Kuriles. Some of the lines with a high degree of inbreeding fastened too thick "plush" in the short-variation, hair lost its shine, which is characteristic ancestors acquired a "double" texture. Animals with long hair divided into fairly long-haired, with hair down to 5-7 cm in length and semi-longhair with a rich collar and lush pompon, but wool semilying to the body and too soft tecture.
Many breeders began conventionally divide Kuril Bobtail on vnutriporodnye types in their place of origin. For example, kunashirsky and iturupsky types (under the name of the islands of Kunashir and Iturup). I believe this separation unnecessary and even harmful to the breed because, despite some differences in style and method of forming the tail, the animals are sufficiently uniform and yield excellent results when crossed with each other. Each of these lines is both positive and negative features. For example, iturupskie animals have a shorter and more tightly curled tail, and kunashirskie more massive bone structure, heavy head and a thick, rich fur. More relevant to combine their advantages, rather than get two types of non-specialist malorazlichimyh bobtelov based on the same mutation. This will delay the development of the breed and sow unnecessary discord and misunderstanding between the breeders of cats.
Unfortunately, the breeding Kuriles got a lot of cats with unknown origin, many of which have a tail, is absolutely unusual for native species or are the descendants of illicit mating with females of other breeds. Such animals are widely used in breeding as the desire of the owner to earn a popular breed, and because of the paucity of source of breeding material. True, today there are many enthusiasts who gather on a single person of breeding material and are designed programs pairings.
Since the Kuril Bobtail - a relatively young breed, then talk about the genetics of short shrubby tail is quite difficult. Virtually no one put the control crosses Kurilov with normal, or Bobtail tailed cats of other breeds. It was assumed that the mutation of the tail of the Kuril Bobtail dominant, inherited polygenic (ie multiple genes). Rare, unplanned mating Bobtail with long-tailed cats showed heterogeneity short tails in the offspring. Some kittens have tails almost normal length with several deformed vertebrae, the other kittens had a tail of type "Delayed bobtail", some of them had a wonderful, short Bobtail tail. Birth of long-tailed individuals without fractures at the tip was not observed, but argue that their can not be difficult, because number of such matings were sufficiently small to produce reliable statistics.
Very interesting information about copulation Kuril short-tailed cat with the Thai Bobtail. Unequivocally that the tails of these two breeds have different genetic nature, because virtually every such binding kitten is born with a straight, flat tail of normal length! The remaining kittens are almost all short-tailed (2-4 vertebrae, with plenty of breaks), are sometimes born tailless kittens, but do not have a seam sacral vertebrae and other skeletal changes characteristic of menksovoy mutation Tailless.
On family trees of some Kuril Bobtail can find out what made binding with the Japanese Bobtail. Unfortunately, this is not indicative binding, because Many Russian Japanese had the same origin with the Kuril Islands, and to assert that their tail has a different genetic basis, it is difficult. Theoretically, if we assume that a short tail Japanese Bobtail recessive, then the kittens will have the same splitting along the length of the tails, as in the binding of long-tailed cat. Only the second generation will be able to show the results of the joint action of these genes. Many breeders and geneticists suggest that the formation of rocks occur mating of Japanese short-tailed cats and native long-tailed cats. Is this true? Today it is impossible to answer. Maybe when it will be better known mutation Kuril short tail, the answer to this question exists. To really believe that the mutation of a Japanese short tails and smoked arose spontaneously, independently of one another. While the factors that cause these mutations could be the same.
This theoretical questions, and for the Russian breeder more importantly, how are inherited among our tails, still not homogeneous, but the native population Kuril Bobtail. Here, the full statistics provide a very difficult, but the basic pattern to follow, perhaps.

For cats, with a reasonably long tail, long 8-12 cm (panicle or Delayed bobtail) often chosen cat, with a very short tail (short spiral or stump). This is done in the hope of kittens with short tails. What do we get? Usually one of the kittens has a tail on the Delayed bobtail type, and the remaining kittens have a spiral of varying length: from 2 to 6 cm is made. But for the most rapid progress breed kitten with a tail "Delayed bobtail" should be excluded from breeding (as is the structure of the tail is a fault, the breed standard, respectively). This hardly happens, because all individuals naperechet and lose the breeding material, we can not afford.

Tail-stump is very tricky. Usually, an animal with such a tail is very upbeat with mild croup gibbosity spine. When binding with this type of tail is often a decrease in the number of vertebrae or Tailless. Which again is not up to standard! Cote producer with a tail of type "stump" very well shorten possible "panicles", but again the offspring is fragmented, and in the same litter neighbors tailed Bobtail with virtually tailless.

Most stable in the inheritance of ponytails, constructed according to the type spirals. In the crosses of two manufacturers with this type of tail kittens in the litter of the same type, there are no individuals with the extreme limit length of the tail. Perhaps it is this type of tail, and must give preference for further breeding. Animals with tail-Spirals have gradually raised large gibbosity without (or with very light gibbosity) of the spine, their tail is not painful at probing.

Tails on the type of "whisk" or "Delayed bobtail" often referred to as continental Bobtail. Probably this type of tails associated with crossing bloodlines long-tailed cat that is very difficult to control, bringing native animals. But this is only version. These tails are also difficult to forecast in copulation. Sometimes mating with inbreeding to the manufacturer with a tail-whisk makes short-tailed cats, which confirms the version of the polygenic inheritance of the tail, but it does not help in the understanding of inheritance.

Today it is important to all breeders Kuril cats together, because our fragmentation is only to the detriment of the breed. Everyone knows how difficult it is to find the islands of different animals, such as expensive and difficult to organize an expedition. We have to settle for the crumbs that fall to us from returning from military missions or scientists who are guided by emotions more than the breed standard in the selection of kittens

© From an article by Svetlana Ponomareva (kennel elite cats «Russica»)
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