The tail vertebra belongs to the spinal column and spinal cord is another part of the skeleton. The formation of the skeleton begins in a fairly early stage of embryonic development, to be precise, in the mesoderm (cotyledon stage). The mesoderm starts the development of the vascular system, including the heart, muscles, and urinary / genital systems.
The complete development of the fertilized egg to young pup and the subsequent growth of the dog is determined by hereditary factors. In studying the development of the spine of a mouse, found that about 20 genetic factors are responsible. It is a fairly complicated process, so it is obvious that if anything can go wrong.
Mutations are not rare. This allows defects occur in the genome (total genetic properties localized in the nucleus). If it happens in the genes will be transferred defects in offspring. Genes are not always exhibit defects in genotype (the set of hereditary properties and inheritance passed). There can be several different causes.
The type of inheritance (recessive or dominant) is one of them, so the interaction between different types of erfelijkheidsfactoren.Belangrijk the number of hetrogeniteit (heterogeneity), for example, the variation in the genotype
Deformations of the tail vertebrae are part of the skeletal defects. These can take several forms and depend on the defect in genotype. The tail can disappear completely or deficit with a fairly blunt end. The tail may also contain one or more bends in different variations, crooked and bent, and sometimes there are too few or too many vertebrae, sometimes even double. There are also defects seen in central backbone connections.
Curve tails may have some weeks after the geboorte.Wanneer the deformation is confined to the tail than it has no influence on the life of the dog, he can lead a happy life.
But if a dog with a deformation, even one confined to the tail, is used to breed, then his little defect “serious consequences for his descendants. Not only for the tails, but also in other parts of the spine. There are dogs born with deformed neck, chest, back and lumbar vertebrae. There are cases of puppies with a cleft palate, hydrocephalus, crooked jaw, deformed ribs, too much or too little teeth and short legs (from knee to foot).
As a result of the interactions between different genetic factors may defects occur in organ systems developed in the mesoderm.Voorbeelden are persistent embryonic weak blood vessels, septum defects, ectopic ureter (abnormal position of urethral), absence of the anus and cloaca (drain) formation.
These defects are usually categorized as non-hereditary birth defects. It is possible, but while it has not been established as a non-hereditary defect, one should play it safe and assume that the cause may be genetic components.
The opposite opinion “shows that it is not hereditary” can be dangerous for breeding
The link between these organ systems and deformations in the curve tails that are found in parents or relatives of both parents is in quite a number of casesdeformations are also found in other species, namely pigs and mice. Scientific research in mice has been shown above.
It is always very irresponsible to breed dogs with a crooked tail. That means one whose tail vertebrae in a straight line but twists and deformed.
Obviously this also applies to curved or bent back, deformities of the ribs, curved jaws, short legs or too many or too few teeth.
Experts have a duty to the dog very carefully to assess them, including the tail. Defects in the skeleton and other health problems and welfare of the dog or its offspring, should always be noted for further information to breeders and owners. For this reason, these dogs are not valued as excellence. It is in fact a deviation from the correct picture of the dog.
Breeders, especially those interested in breeding dogs whose tails are shortened, must be very vigilant regarding the tails of newborn puppies. These breeders have to register and inform the future owner.