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It is often done when breeding for a specific trait, for example, if 2 siblings have extreme pattern or colour.
When done for the sake of it, I wouldn't recommend it.
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It's not recommended.
Sometimes, e.g. with recessive traits, such as albinism, the only way to carry on the line is by inbreeding. Ideally this should then be followed by a flurry of outcrossing then re-crossing, to ensure genetic diversity in the line. With "line-bred" (generally meaning less intensive inbreeding) for a colour, direct sib-sib / offspring-parent inbreeding is often used as a shortcut to a fat wedge of cash, often at the expense of the long-term health of the line. That's why many high-colour animals / extreme morphs are more prone to "problems" / defects. Outcrossing can help, but obviously reduces the trait that you were breeding for in the first place, so you then have to keep selectively breeding for longer. Inbreeding with animals such as leos that are sometimes available WC is less of a problem if you regularly outcross them to these WC animals. A WC animal is heavily pressured by natural selection, so usually has very solid genes. For animals such as bearded dragons, where no WC animals are (legally) available, inbreeding is more of a problem - it has been going on for a long time, so many animals in captivity aren't as gentically strong as their wild counterparts. That means that outcrossing can be less effective in bringing the line back up to strength. Inbreeding "for the sake of it" - e.g. because someone bought a brother and sister and wants some babies, is irresponsible to the long term health of the line. Generally the same people who do that don't know what outcrossing is, so you will end up with animals that have the potential to become genetically weaker over time. Inbreeding for a particular trait is debateable - some people are anti-morphs; some people like morphs. However, there is usually a "long-way-round" to the morph - e.g. breeding slightly related animals (cousins or less) helps to maintain genetic strength, whilst still enabling you to (slowly) build up the desired trait. For recessive alleles (such as albinism), after the initial, "required" inbreeding, animals can be crossed out continuously to distantly related animals for several generations to ensure fresh blood in the newly-created line. Again, it will take longer to get these animals on to the market. In my personal opinion, there is no need to breed sib-sib or parent-offspring more than once in a line - people who do it frequently are taking shortcuts, whilst gambling with the long-term health of the line. This is especially important in species where there is no flow of fresh blood into the line from the wild. I would also not breed an animal to it's uncle / aunt (relatedness 25%). Cousins (relatedness of 12.5%) is around where I would draw the line, but only for lines that are genetically strong to begin with, and certainly not every generation. |
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Truth is there are a lot of morphs that was built up number from mass inbreeding all the recessive traits that's albino's trempers/bells/rainwaters,blizzard,patternless'etc'etc.plus linebred trait tangeines,jungles,striped'etc'etc was all inbred at the begining.As the breeders only had the one and you had to breed it to one of the same genetics.These days there no need to inbreed onless you have a genuine real goal in mind or to prove a gene that you have from a odd looking hatching you've hatch.
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