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Rhodesian ridgeback


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Well if my American bulldog can bush with the terriers and I mean straight into thick bramble, find his own stuff to chase, pick up scent and track over long distances and work the lamp at night I don't see why any other hunting bred bigger dog breed thats put together right and brought on right can't do the same.

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I remember seeing somewhere that the ridge on there back is a form of spina bifida and the ones that were used to bring lions to bay dont have it. Shame really that breeders of these fine looking dogs PTS any that dont have this ridge. ATB

its genetic

 

Ridgeless Rhodesian Ridgebacks don't carry the ridge gene at all, and cannot produce ridged offspring any more than a Chesapeake Bay retriever or Chihuahua can. Ridgeback breeders who are interested in ridge inheritance often forget that not having a ridge is the normative state in dogs. The ridge gene is a dominant mutation that makes our ridged dogs different.

If a Ridgeback has a ridge, he is either carrying two copies of the ridge gene (homozygous), or just one copy (heterozygous). Either way, the dog will have a ridge -- you can't tell if he has one or two copies from just looking at him. You might be able to figure out his genotype (that is, whether he is heterozygous or homozygous) retrospectively based on breeding history.

It is the breeding of heterozygous Ridgebacks that produces ridgelessness.

When two heterozygous dogs are bred together, each puppy has a 25 percent chance of being ridgeless; a 50 percent chance of being ridged and heterozygous (only having one copy of the ridge gene) and a 25 percent chance of being ridged and homozygous (having two copies of the ridge gene, and so never producing ridgeless no matter who they are bred to).

Homozygous dogs -- those with two copies of the gene -- will never produce ridgeless. That's because, when it comes time for homozgyous Ridgebacks to donate one of their two genes to offspring, all they have to pass on is a ridge gene. And because the ridge gene is dominant, no matter what the other parent contributes, the offspring will have a ridge.

When a homozygous Ridgeback is bred to a heterozygous Ridgeback, all the puppies will have ridges, but genetically they can be different. Each puppy has a 50 percent chance of being homozygous (having two copies of the gene, and never producing ridgeless) and a 50 percent chance of being heterozygous (having only one copy of the gene, and so potentially producing ridgeless if bred to another heterozygote).

Unfortunately, without a genetic marker test, we cannot tell the last two apart just by looking at their outward appearance (what scientists fancily call phenotype).

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