Because of selection and proofing the end product.

Most of the scientific information involved around breeding is based on show dogs, some hunting stuff but the closest performance related would be horses. That information is a little off because they do not have litters. There is far less subjects to be in comparison.

There are no double blind studies in regards to gameness, its definition or its preservation. The bulldog guy must take that information and apply it the best he can and usually that will fall on personal experience. And that personal experience is normally within a line or within a family.

I agree with the last part. I mentioned a dog I have in an earlier post. His sister has won. His brother, although with limited skills, he was skull drug. His mother won and his sire was a crazy ass red Boy dog that would scratch to a sign post. All of his family started up early and were 'grown' before they were mature. My dog in turn, cold as ice. Zero interest.

If I did not have access to his brother that possess the traits I am looking for, I would take a chance on the cold dog because everything in and around him could be taken up and down the road. Just like the heredity and traits part of the Canine Biology reads, I would not want to also breed one of his sons that turned out cold (if he were bred)

The hard part of the science is factoring in personal experience as science had no room for personal experience, personal preference or subjective variables. Gameness being one. Most will agree it comes in varying degrees. Those degrees are subjectively defined.

Another example from the Bolero family is Two Eyes. Many will say Bandit quit. I'm thankful he was bred and in the breeding to Bolero popped out Two Eyes. Two Eyes to Loca made an exceptional bitch in Miss Two Eyes. Miss Two Eyes when bred to Patrick's Kasai made my Cornbread and Chloe dogs. Chloe like her mom was methodical and smart and broke things down and then showed finish. Cornbread on the other hand was the happiest dog to ever be in a box. He needed two keeps. One for him to be in shape and then an extra keep because of his wagging tail. He absolutely enjoyed working.

Bandit to Bolero was not exactly inbreeding or line breeding. Two Eyes to Loca not so much either. Miss Two Eyes to Kasai was a complete outcross. The quality was high and the percentages were high.

Not to but in, as I am looking for Bolero's response as well, but I think the answer is selection and proofing.

EWO