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I don't cull by PT score, I tend to ignore it entirely in my breeding stock except for bootstrap. I only keep red 2g from my yellow stock, probably 80% in a big pasture come out red but I further cull those by comp testing. I only keep blue 3g in any lines, but it's a much lower percentage that come out blue when you start with yellow. In my big lines there's plenty of keepers, but in a 10 acre pasture it's pretty common for only the BIP foal to be A/blue for third generation. So 10% with some variation between 0-20% on different months. This is also with a full 30 pasture bonus

@ammit will you adopt me? :)

After SBA, I alter all inconsistent. Then I cull anything that doesnt fit my color/ gene requirements. You have be Hom sooty, DP, and ee to be breeding stock in my barn. I also alter all foals that didn't get the genes I want from the line (ie mushroom or wtc or ww).

After all that, I paper and cull what doesn't meet requirements. Then I comp test and cull anything aga.

I get 6 to 10 foals from a 100 acre pasture that stay as breeding horses, sometimes 1 to 4 from the small pastures. The rest are all show horses.

I only keep B/Red 2Gs and prefer my stallions comp test superior to an exceptional producer if I can't afford to max. Almost all my 2Gs pass the paper level benchmark when they're out of fully pasture-boosted perfect foundations. For my new line, I use only maxed colts for every generation. For my older lines that I'm not spending a ton of GMTs on anymore, I just use the best of bunch each generation or do comp testing until I find a stallion that tests as good as or superior to another best of bunch of the same generation. I rarely gender swap a best of bunch mare to a stallion as I don't do a ton of comparison testing of mares so I like knowing which girls in the herd are the best. I mostly breed fully stocked 100-acre pastures so I can be pretty sure that the best of the bunch is pretty darn good. I keep more colts intact than I should, but I only use one per fifty mares each generation, so anywhere from four to six stallions per generation to cover all the pasture mares. (I'm so glad now that two stallions can fully cover 100 mares in a pasture without the breeding cycle stopping part way, so it perfectly uses all the breedings and gives me the actual best of the bunch.)

For 3Gs, I keep only A/Blue and I tend to keep only best of bunch stallions for breeding or max the best color colt if I can afford it. I'm still looking for a way to have a surefire comparison testing standard for 3Gs like I have for 2Gs. So far I've just been comparison testing to past best of bunch 3G colts that have produced well to find other good breeding colts.

I keep only A/Blue 4Gs that test superior to sire/dam (this is the expensive generation, so I do a color cull before quality cull unlike my lower generations).

And I only keep Star/Gold 5Gs that also test superior, because I have had Star stallions that only tested as good as their A sires, and that's not a stud I want to use. I might let a Gold mare slip by for a while though even if she only comp tests as good as, especially if I don't have a ton to choose from in that generation yet. After that I start egg pulling/flushing and AI breeding and doing a lot of comparison testing and some maxing as I can afford. I haven't figured out when I should be expecting to hit **Star/**Gold yet, but maybe 8G? I'll see in a few months when my 7Gs are old enough.

I fully test everything I breed. From yellow/c stock I only keep as breeders those that are red/b. If a colt it must test superior to sire (regardless of paper level). I used to auction off anything not superior or below a 10 on points. But last few generations I have kept everything.
I am currently rethinking exactly what I am breeding and realizing I had way too many colts so have gone on a massive gelding spree.
I seem to hit a good number of gold/star by 4gen, but also by then getting more show ponies than breeding stock.
I am not overly concerned with maintaining even generations, especially when developing a fantasy line.

@Iecobb8 Lynn doesn't start comp testing until 4th gen :)

Ahhh, gotcha!