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by bondos mom on 30 June 2009 - 01:06
HI AGAIN, CAN SOMEONE TELL ME WHAT LINE BREEDING IS? AND ALSO, DO BREEDERS BREED BROTHERS AND SISTERS WHO HAVE EXCELLENT BACKGROUNDS AND PEDIGREES? I KNEW A LADY ONCE WHO BREEDS AKC CHAMPION ENGLISH BULLDOGS AND SHE SAID THEY BREED BROTHERS AND SISTERS ALL THE TIME TO KEEP THE BLOODLINE STRONG.........................
by Sunsilver on 30 June 2009 - 02:06
Bondo, linebreeding is having the same ancestors show up in the pedigree of both the sire and dam of your dogs. The German regualatory body for the GSD, the SV, frowns on linebreeding that is closer than 3 or 4 generations back. I believe that if you breed any closer than that they will refuse to register the puppies.
The AKC, and its Canadian equivalent, the CKC, unfortunately, has no restrictions on breeding. You can breed daughter to father, sister to brother and they don't care. Your dog can be blind, have hip dysplasia and only one testicle, and they still won't care, and will be glad to collect your registration fees!
The above type of breeding (father/daughter, etc.) is called inbreeding. In humans it would be called incest, and be against the law. In my opionin, it WEAKENS the bloodline, rather than strengthening it.
Try to get some information on basic genetics so you can understand this better. Each dog inherits its genes from the chromosomes of its sire and dam. It gets one copy of the gene from the father and one from the mother. A certain number of genes in each animal will be recessive. They will not be expressed (show up) unless the pup inherits two copies of the recessive gene. A dominant gene will be expressed even if the pup only has one copy. A good example is the longcoat gene. Both parents must be either longcoats, or carry the longcoat gene as a recessive in order for the pup to be a longcoat.
Okay? Are you with me so far?
So, why is inbreeding a problem?
Because a certain number of recessive genes are either harmful or lethal, and if you mate brother to sister or father to daughter, the chances of these genes showing up in the pups is much higher. Some breeders feel thta if they inbreed, they will eliminate these genes. Not necessarily so. Genetics is more complicated than that!
The other problem is that inbreeding produces what's called 'inbreeding depression'. After several generations of inbreeeding, the offspring become small, weak and sickly, mostly due to the accumulation of too many recessive genes. New blood needs to be brought in to freshen up the gene pool.
It is possible to inbreed without being aware of it. Many of the German showline dogs are heavily bred on dogs like Palme von Wildsteiger Land and Quanto v. Wienerau. My own bitch has Palme at least 10 times in her 7 generation pedigree. This is NOT good. This is why many really serious breeders calculate what's called a COI, or coefficient of inbreeding before mating two dogs. It looks at the dogs that are many generations back in the pedigree, and tells the breeder if too many of them are the same in both the male and female. Some dogs have been so inbreed (e.g., the Shetland Sheepdog) that the COI for seemingly unrelated dogs can be the same as if they were brother and sister!
There are many excellent articles online on genetics. Maybe someone can suggest a few links, or some books you can read. It is VERY important for a breeder to understand how genetics works!
The AKC, and its Canadian equivalent, the CKC, unfortunately, has no restrictions on breeding. You can breed daughter to father, sister to brother and they don't care. Your dog can be blind, have hip dysplasia and only one testicle, and they still won't care, and will be glad to collect your registration fees!
The above type of breeding (father/daughter, etc.) is called inbreeding. In humans it would be called incest, and be against the law. In my opionin, it WEAKENS the bloodline, rather than strengthening it.
Try to get some information on basic genetics so you can understand this better. Each dog inherits its genes from the chromosomes of its sire and dam. It gets one copy of the gene from the father and one from the mother. A certain number of genes in each animal will be recessive. They will not be expressed (show up) unless the pup inherits two copies of the recessive gene. A dominant gene will be expressed even if the pup only has one copy. A good example is the longcoat gene. Both parents must be either longcoats, or carry the longcoat gene as a recessive in order for the pup to be a longcoat.
Okay? Are you with me so far?
So, why is inbreeding a problem?
Because a certain number of recessive genes are either harmful or lethal, and if you mate brother to sister or father to daughter, the chances of these genes showing up in the pups is much higher. Some breeders feel thta if they inbreed, they will eliminate these genes. Not necessarily so. Genetics is more complicated than that!
The other problem is that inbreeding produces what's called 'inbreeding depression'. After several generations of inbreeeding, the offspring become small, weak and sickly, mostly due to the accumulation of too many recessive genes. New blood needs to be brought in to freshen up the gene pool.
It is possible to inbreed without being aware of it. Many of the German showline dogs are heavily bred on dogs like Palme von Wildsteiger Land and Quanto v. Wienerau. My own bitch has Palme at least 10 times in her 7 generation pedigree. This is NOT good. This is why many really serious breeders calculate what's called a COI, or coefficient of inbreeding before mating two dogs. It looks at the dogs that are many generations back in the pedigree, and tells the breeder if too many of them are the same in both the male and female. Some dogs have been so inbreed (e.g., the Shetland Sheepdog) that the COI for seemingly unrelated dogs can be the same as if they were brother and sister!
There are many excellent articles online on genetics. Maybe someone can suggest a few links, or some books you can read. It is VERY important for a breeder to understand how genetics works!
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