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by Jantie on 03 April 2008 - 08:04
Etc, etc.
All of a sudden, everything came to the surface, or shall we say, everything collapsed. What had been lies for many years, apparently was the truth indeed, and the evil had spread wide out. It was raining confessions. Let history take its course.
You once wrote me in private, you’d be interested in some particular figures for your upcoming book. (Now THAT will surprise the world!) You told me exactly what figures would be of interest. Now I trust you won’t need them anymore, but, I’m still waiting for a copy of that book. Please do advise.
Jan
by marci on 03 April 2008 - 08:04
That's probably why the S.V. could be thinking of REINSTATING LSCs...??? Puppy production is LOW and most of the good genes are comming from the ones that are being banned from being S.V. registered.... You may not know it but the LSC registry for GSD could probably hold the link to unify Show and Workinglines since the LSC gene is common on both sides of the GSD spectrum...
Its so good to be back... :) Now I have time researching on my beloved breed... Marci
by D.H. on 03 April 2008 - 15:04

by D.H. on 03 April 2008 - 15:04

by darylehret on 03 April 2008 - 17:04
D.H., I believe you put that into excellent perspective. Jantie, I look forward to seeing more of your efforts, with a little more objectivity involved.
Genetic diversity is directly relevant to the level of inbreeding that occurs after the formation of the breed, once the "stud books" have closed, and what unseen variance is lost from assortive mating. It all depends on what is selected for, and what may be unknowingly genetically-linked to traits you've selected against. There are many breeds that have survived well for a century or more founded by as few as a dozen breeding stock. Even "experts" cannot seem to agree the requirements for adequate genetic diversity.
"Everybody agrees that 300 (wolves) and 30 (breeding pairs) is the absolute minimum and that 1,000 wolves is a much more viable population," ~Ed Bangs, wolf recovery coordinator for the Fish and Wildlife Service.
"The current population is genetically diverse. All the careful planning - picking wolves from different packs in Canada - paid off." ~ Dr. Robert Wayne, Yellowstone researcher
"We believe that the original recovery goals of 300 wolves in the three states are arbitrary, inadequate and unscientific," ~Sylvia Fallon, ,conservation genetics, Natural Resources Defense Council
If you substitute the word "breed" for "unrelated breed founder" in the chart below, you can see that it's possible for a high level of genetic diversity to be maintained for many centuries based on few founders.
by Speaknow on 04 April 2008 - 09:04

by darylehret on 04 April 2008 - 16:04
Well, I fail to see what you are disagreeing with, or in what way my views fail to correspond "with proper scientific findings". You say Inbred, I say adapted. Genetically diverse may mean more adaptable, but inbreeding means more adapted, or 'specialized'.
Genetic and non-genetic factors driving extinction is greatly debated. Genetic diversity indices, such as alleic richness, are significantly higher in the wild than in captive or domesticated populations in general. Genetic variability will decline from its ancestral levels by undergoing an amount of local adaptation, due to selection pressures like assortive mating or inbreeding. In critically endangered populations, the viability of wild stocks can be compromised by attempts to increase their genetic diversity that show no evidence of inbreeding depression. Such attempts promote the spread of deleterious alleles adapted to a different environment, and break down locally adapted genomes (purged of deleterious alleles) by introducing alleles adapted to a different environment, or risk local extinction due to unpredictable environmental changes to which this genetically impoverished population cannot adapt.
We are basically in agreement, you are not clear at all at what you disagree with. If you really want a debate, I say -- genetic diversity (buzzword) is not as vital to the survival of a species as is portrayed, and there are no "proper scientific findings" that can prove it.
by Jantie on 07 April 2008 - 20:04
"SV-Stud-business" now available in PDF-format on my site: www.bloggen.be/hd
and on: www.petwatch.at
Sorry I could not yet find the time to translate, but the figures are quite universal.
Godspeed!
Jantie
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