I tell y'all something I've seen over the years. It's natural and common sense to a degree. Say I have two full brothers or two full sisters and one is exceptional and the other is a good dog but just not quite the dog the other is be it build, performance, etc. Everyone is gonna want to breed that exceptional one, and they should. BUT, I've seen too many times when the lesser of the two was actually the better producer. I've seen it in dogs, game chickens, and even homing pigeons and horses. Don't be too quick to discard or shy away from the lesser dog. If they are a cull then by all means don't breed it. You have to breed to dogs that are out of consistent, high percentage litters. One good or great dog out of a litter, no matter how great it is, isn't worth breeding to if all the litter mates are sub par. The odds are stacked against you and the odds of that great dog reproducing itself are extremely low. This is in scatter bred dogs and tight bred dogs alike.
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T-dog...you are right in both ways...scatterbred has a higher probability of greater variation...line bred and inbred has a lot lower chance of variation...but a breeder must be consistent in what and how he breeds his dogs within the family...
An extreme example of line breeding and inbreeding can include an English bulldog and BMC cross and that produces variation because of style of breeding within a family...that in my opinion gives it a bad name...
When I bred my old line of Mt curs they were tight bred and I only bred the very best within the family and the dogs hunted harder, faster and became grittier as more generations were produced...
I once bred to a smaller gyp that tested pretty good as a pup...she consistently rolled out alone as a 3-4 month old pup so I kept her...she was a lighter cream color and was not going to be over 37 pounds or so when grown...so a friend needed a strike dog and I gave her away at 6 or so months old...when I dropped her off we made a hunt and right off she treed a coon and went on to make a good dog...
I lost my main female so I called my buddy and it just so happens he had to stop hunting on account of personal issues...I pick her up and breed her to her grandfather...the smallest puppy, a female reached 45 pounds and was heck on wheels...I kept her on account she looked to be perfect in every way...maybe too much hunt and no quit And grit to spare...I bred her to her father who was also her grandfather...the pups produced were pretty awesome...but too much grit in my opinion...
I tried to only breed the very best but my logic told me that that little female wasn’t my cup of tea but...everything inside of her was...there was never any doubt about that...
Outcrossing would have been my last option...