Inverted Molars..Question mode of inheritance - Page 1

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by myladadog on 10 February 2008 - 18:02

Many years ago, I bred a bitch with inverted molars to a dog with fulldentition and no other visable bite defects or abnormalities. the resultant litter of seven puppies as adults exhibited correct mouths.  All had full dentition, no bite abnormalities were present in any of the seven pups. only two pups from that litter were ever bred. Both were females, both were bred to stud dogs that did not exhibit any bite abnormalities. Unfortunatly, I was only able to view five of the eleven pups from one litter as adults, and two of the seven pups from the other litter as adults. Of the seven (in total) pups I did examine as adults ranging from one to five years of age, none showed any bite abnormalities.  However.of the adults whose bites were correct that I did view..one was bred to a dog with full dentition and no evidence of any bite abnormalities.  this dog(a bitch) had eight puppies. I again had the opportunity to examine the bites on all eight of those pups. One puppy exhibited at 10 months of age, with an inverted molar..the other seven had full dentition with no bite abnormalities.

Now, it is my belief that all 'bite" abnormalities are reccessive in nature. it is my belief, based on limited experience admittedly, that correct scissors bites, ie. full dentition, no bite abnormalities such as inverted molars, over shot/undershot, missing premolars (and the list gor=es on) is a DOMINANT trait.

It is my belief that ANY deviation from a completely correct bite is reccessive in nature and because it IS a reccessive..it cannot present in offspring with out a like 'partner gene'. I also feel that BOTH parents CAN present with excellent bites (dominant) and carry any or all of these other abnormalities RECESSIVELY.  But IF one parent is dominant for a correct mouth and doesn't CARRY RECESSIVELY the gene for incorrect bites that, as happened with my bitch years ago, the puppies while having excellent mouths, will all be carriers for incorrect bites. however, when bred, if these puppies are bred to an animal that carries no Reccessives for incorrect bites, then there is no chanv=ce of any of their pups exhibiting with incorrect bites..but SOME may well carry this undesirable reccessive, while others will be completely free of the undesirable trait., and be dominant for corect bites.

Unfortunately, ther is NO test available at present nor is anyone (to MY knowledge) working on finding the DNA markers for bite abnormalities.

Thus, I feel, that one must be vigilent in breeding a dog who they KNOW has anything less then a correct mouth. But the problem exists when planning a breeding to incorporate all aspects(desirable qualites), present in the considered pair. 

I would like to begin a discussion with other collie breeders, regarding this problem.  I would like to know what in your opinions would you suggest one do in this type of situation?  I feel personally, that I should never have bred that original bitch, who exhibited with the incorrect bite of inverted molars. however, this bitch did have many other highly desirable qualities. However I DID breed her..and now fully 3 and 4 generations (that I have personally examined) down from that original bitch, the inverted molars are still presenting..albeit in only  one pup in the third generation and one pup in the fourth generation. A pup from the 3rd generation down from this bitch,  a bitch taht has a beautiful correct bite, produced a litter of seven living puppies, ONE of which at seven months of age does have inverted molars. Though THUS FAR the other pups are fine.

Yes the other desirable qualities we had sought to maintain are still present in these currant pups. What, under these kind of circustances would you as breeders do? Knowing that there really IS no way phenotypically  or through testing to determine if the recessive is present in offsp


ShadyLady

by ShadyLady on 22 May 2011 - 14:05

There isn't much to be done, except to have the inverted molar pups spayed/neutered (regardless of how beautiful and sound they are) and to breed any desirable pups to dogs that have perfect dentition. There isn't presently a genetic test for this as frankly, the money being spent on genetics in Collies is for serious ailments. You seem to be doing pretty well in breeding it out, though.

You could try an outcross to a bloodline that is free of inverted molars, but it's a challenge at times to find a breeder who will be honest with you about their dog's pedigree being free of inverted teeth (or any other problem).







 


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