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 Post subject: Line breeding
 Post Posted: Thu Feb 05, 2009 10:59 pm 
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Joined: Sat Sep 27, 2008 8:28 am
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Location: USA
It happens that I found this article about line breeding tonight and I thought that I would share. It is one of my favorite articles on the subject for a couple of reasons. First because it is a complete explanation of the cost and benefit and includes a little dabble in method. Second because it relates to working dogs. Third because it helps dispel theory associated with outcrossing and random breeding. Fourth because it is written in laymen.

http://www.westwindgsps.com/linebreeding.htm

Steve

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 Post subject: Re: Line breeding
 Post Posted: Fri Feb 06, 2009 10:49 am 
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Steve that citing of Dr. Bell is used by many many many breeding clubs all over the web.
I could not pass up on quoting part of it here though :)

Quote:
Too many Breeders outcross as soon as an undesirable trait appears, blaming the problem on breeding "too close." Nothing could be further from the truth. In fact out-crossing insures that the undesirable trait will be carried generation after generation in a heterozygous recessive state only to rear its ugly head again and again. Therefore the Breeder who turns away from breeding “close” is simply passing a known problem on to succeeding generations and future Breeders.

When an undesirable trait is "unmasked" the Breeder who does his breed a real service is the one that stays with his line long enough to rid it of the undesirable trait. By controlling which specimens within their line are used for breeding in succeeding generations this Breeder can eliminate the undesirable trait. Once the recessive gene is removed it can never again affect the Breeder's line. Inbreeding doesn't cause good genes to mutate into bad genes it merely increases the likelihood that they will be displayed.

The Inbreeding Coefficient (or Wrights coefficient) is an estimate of the percentage of all variable genes that are homozygous due to inheritance from common ancestors. It is also the average chance that any single gene pair is homozygous due to inheritance from a common ancestor. Our pedigrees display the Inbreeding Coefficient for each dog in the first 4 generations of a specific dog's ancestry. Each Inbreeding Coefficient is calculated from that dog's 10 generation pedigree.

NOTE: Inbreeding does not cause good genes to somehow mutate - it only increases the likelihood that existing genes will be displayed - allowing the Breeder the chance to eliminate what had previously been unseen in their particular line although it was always present.


~Mis

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