I'm interested in reading this answer myself.
I read someone say things should be solid for six generations. This man was very skilled with breeding chickens.
The information on this was in the first have of the 20th century so I don't know if modern day technology has changed this or not.
I was always curious to know why it had to be six generations but I never was able to find out. This wasn't with dogs, but with chickens of course, the person that said this felt it was with all mammals.
Originally posted by az trooper: Is a line breeding 7-8 generations back still a genetic influence on the finished product? I have wondered this myself. I wouldn't see why not. I mean, a dog is going to have an influence on the progency, and so on, and so on. Which can be traced back numerous generations. After all doesnt line breeding just bring the traits closer into the pedegree?
John Haudenshield Webboard User Reg: 07-12-2001
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Originally posted by az trooper:
Is a line breeding 7-8 generations back still a genetic influence on the finished product?
Yes, but to a lesser extent than if in the first few generations.
The 'magic' number of generations isn't necessarily six. Maybe for certain traits in chickens, but certainly not for all traits in all animals. BTW, chickens aren't mammals, they're birds (=aves). The number of generations it takes to 'fix' a character in a population (=breed)depends on many things including the number of genes involved in the expression of that character and how often the animal is capable of reproduction (the generation time).
In some wild populations of bird and mammal species, scientific studies have shown inbreeding at the cousin 'level' produced very 'fit' and 'sucessful' individuals. Remember though these are wild animals under the influence of natural selection, not domestic animals under artificial selection.
You're right birds aren't mammals. To tell you the truth I can't remember if he thought it was the same. My mistake.
I know I need to read alot about Genetics, but how far would they need to go back on the generations if there was no line breeding, or anything. If it was just natural?
John Haudenshield Webboard User Reg: 07-12-2001
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Brad G:
I know I need to read alot about Genetics, but how far would they need to go back on the generations if there was no line breeding, or anything. If it was just natural?
***I'm not sure what you mean. Are you asking how many generations it take to have a line or population breed 'true' to type? If so that varies. The GSD for example really seemed to be showing a common type inside of 30 years. Again it depends on a number of things:
Generation time,
The type and number of characteristics selected,
The genetic basis of those characteristics,
Selection pressure, etc....
Inbreeding and linebreeding will quicken the pace at which individuals exhibit traits. Without inbreeding, it could take longer depending on the above factors.
Of course, I was just wanting to know how far they went back before that went on. Just curiousity. When someone showed the lines as an example how far back did it matter to completely wipe out any form negative gene.
That's if the process works that way.
I know it's not necessary today. Just wondering if anyone knew what they did in the old days.
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