If you can find a repeat mating of a breeding that has produced good dogs you cannot go wrong. Some say that a male cannot produce as well in their older age.
I know in Thoroughbred, the older mares don't normally produce their best offspring when they are older. I am not for sure about the studs. but do you all think that holds true to gyps too? If so, what is prime breeding age and when should one quit thinking about breeding?