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 Post subject: Relation
 Post Posted: Tue Feb 10, 2009 11:20 am 
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Joined: Sat Sep 27, 2008 12:04 pm
Posts: 1677
Location: Burnet County

While most breeders recognize that a mating between half-sibs or cousins represents inbreeding, the majority probably have no idea which is the closer relationship. This is not helped by the non-standard definition of inbreeding in some books (e.g. Onstott's "Breeding Better Dogs").

The standard definition of inbreeding is that it is any scheme which results in the sire and the dam having common ancestors. Many breeders use the term "inbreeding" for close relatives and "linebreeding" for more distantly related individuals, but there is no fundamental difference.
The parameter used to express this common heritage is called the inbreeding coefficient and was first proposed by Sewell Wright in 1922. Designated F by Wright (but more commonly IC or COI by breeders), it can theoretically range from 0 to 100%, and indicates the probability that the two alleles for any gene are identical by descent.

John B. Armstrong The Diversity Project

Another good read.

M.D.Brooks Founding Member & Breeders Committee Chair
Bayed Blue...Bayed True...That's A Lacy Dog
If You can't keep up with the Lacy Dog...stay on the porch!

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