Breeding. Raising, starting, culling

[perk]

How do you guys decide when to breed a gyp, or buy a new pup? How do you decide which pup to keep or buy out a litter? Do you cull something before you get new pup, or wait to see how pup will turn out? When you get a pup do you have to let something go for numbers reasoning? How many pups are you willing/comfortable starting in a season. What age do you give up on quality young dog making the grade? Just wonder how other hunters see things and do it, don't gotta be a Fox Hunter to answer all answers are welcomed and appreciated?