I don't think the issue is overuse of a stud, though. The issues appear when all the tiny little recessive genes start to pop up. With a diverse gene pool these genes are still there but the chances are of having two lines with them get smaller and smaller. But when you line breed and have the same ancestor appear more than once it greatly increases these chances. The more they appear and the closer they are to the puppy will make it even that more likely.
So say one stud sires litters from 25% of the vlcaks out there. While this is a lot (understatement?) if then those puppies are carefully bred to qualifying dogs of the other 75% then you reduce the chances.
"Over" use of a stud is not an issue if done carefully. I mentioned Lance of Fran Jo earlier. He is "blamed" (for the lack of a better term) for what the American line GSD has become. I feel bad for Lance. It wasn't his fault and I'm sure he wasn't bred to a huge percentage of the GSDs un the USA at the time. The issue arrived is when people started to line breed and breed puppies with close ancestors (I'm sure many have him as two grandparents). Then, these dogs got bred to other dogs with Lance in their lines and within a few generations you have hundreds to thousands of dogs who have him several times in their background. This is what needs to be avoided.
So, I think even with one stud affecting 50% of a generation you still have another 50% to work with. While it would cut it close a few generations down, it's still manageable (just not easy).
Quote:
Originally Posted by Vaiva
Well, sure, but mostly most popular studs are nice dogs, with good character and good reproducing "skills"  |
Even the best dogs in the world have pesky little recessive genes that can pop up.
