02-03-2010, 04:51 AM
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Pet Forums VIP Member
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Join Date: Nov 2009
Location: off the Chesapeake Bay in USA
Posts: 10,917
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Re: Canadian Vet-Journal: CKC regs + breed-stds
Quote:
EXCERPT - bold added -
Recent studies have demonstrated that for every 10% increase in COI, there is a 7% decrease in litter size and median lifespan, and that any COI above 9% pushes perilously past the genetic threshold of health (2).
Wright’s Coefficient of Relationship (RC), measures the degree of genetic relation between 2 individuals (2). Normally, 2 random individuals in a population will have an RC of 0, and 2 siblings will have an RC of 50%. In many dog breeds, 2 randomly chosen individuals will have an RC above 50%, which is a degree of genetic relation greater than that of 2 siblings. Two purebred siblings will frequently have an RC measure greater than 80%, which is unheard of except in the case of identical twins (RC = 100%). The alarming reality is that “unrelated” purebreds today are actually genetically related to a greater extent than individuals that are truly related.
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thats not good... 
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terry pride, APDT-Aus, apdt#1827, CVA, TDF
*wolves R wolves, dogs R dogs, + primates R us.*
tmp, sept-2007 
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