[gemy]

If you are breeding to support yourself, provide a roof over your head, food and clothes for yourself and perhaps your children. There is an incredible pressure to base breeding decisions on financial economics. You just can't be objective over what tests to do and why, who to breed with and why, how long to keep the puppies.
When to vaccinate, how much and what kind of support you give your puppy buyers.

When profit margins predominate-health of the puppies is likely to be the first thing to suffer.

The most respected breeders, the crème de la crème strive to improve the breed, and place a huge amount of time and commitment to do so. Spaying and or neutering males or females that don't meet the grade in either conformation or health. At their cost might I point out. And they leave this breed better than when they found it.
At the minimum a very good breeder will keep the YT to standard and in good health - breeding fine representatives of the breed on a consistent basis. They too will neuter and or spay - dogs with health problems that might even crop up in year 4 or 5. They will deliberately pull from their breeding programs any such dog.

To do either one of these things is to invest a large amount of time in research, in studying, in learning. To show, to train, to breed, to whelp, rear and finally place their puppies into great homes for them.

A great breeder and a good breeder never, ever, stops learning and growing. And one day they will know enough to share, to give back to the novice breeder their knowledge.