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In this Discussion
- Ammit February 2018
- BlueValley February 2018
- dark star February 2018
- FallenShadows714 February 2018
- Salvistar February 2018
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Culling buy AFPT
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If I cull my mares by AFPT what are the lowest scores I should Keep?
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The strictest lines typically have an AFPT score of .4 above the mare's--in my experience. If you want to breed for quality, I'd cull those that have AFPTs lower than their own. Until you work up to .4-.5 increases, maybe shoot for .2-.3 increases to start. :)ID# 25784 Home of quality Artylian Drafts & Cobs
Breeding little classic champagnes, pearl snowflakes with DP, KP with DP and other goodies, and axiom on pearl dilutes. -
Personally I just cull my mares by lowest AFPT in their breeding group. So for example I have all of my red papered Warmblood Mares in one barn. I cull the bottom 1/6th of mares in that barn each year and replace them with new mares to try out next year.
Probably not the strictest scenario, since obviously I have some mares in that barn who are producing way better than some of their counterparts closer to the bottom cut off each year. But it keeps my barn full of breeding ladies, and I'm keeping at least the upper crust of the stock I have available to me.SALVISTAR PERFORMANCE HORSES
Barn ID - 2358 -
I also cull the bottom 10% or so. Jumping up 0.4 points per generation is easy in the beginning, later it becomes a much slower progression. It has taken me 2 years to go from 13.0 to 13.8. That’s 24 breeding rounds, 3 rounds per generation, roughly, so 8 generations to get 0.8 points of improvement. Those aren’t even my AFPTs, just my highest PTs. My current breeding stock has AFPTs ranging from 12.8 to 13.7.
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Holy cow, it gets that hard the higher up the PT scores you go? Wow
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Because of mare lag, not because the math changes.
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Is there mare lag because it takes them an extra year to reach breeding age?
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No because people are stricter when it comes to keeper studs than they are mares.
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Ah, ok thanks Ammit!
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Yup, it’s more that things get a lot harder to determine once you get higher level. AFPT is only a very rough estimate of a mare’s quality. It is effected heavily by the sire used, as well the random number generator. It is easier to determine a mare’s relative quality at lower levels, using breeding papers. I also don’t mind if my mares lag a little, hence why I only use BA on them. I also only assure breed and usually only with a 30 day bonus, which helps... Somewhat.
One of these days I will get brave and run all my mares through SBA. I will proabably cull 80-90% of them that way. -
Does it help if you use the same sire? And then when you switch sires maybe make a note of what their AFPT was before the swap and compare to after? I feel like that would take some of the difficulty out. But then again I can’t comment from experience, only theory
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I have 700 mares, and I only use pastures, so I have limited control over how horses are paired. There is still a random element as well. The small number of foals a mare has in her lifetime means the random factor is going to have a larger impact on their AFPT than on a stud. The more times you roll the dice the more you narrow down what the average is likely to be. So there is a big difference in the accuracy of the AFPT of a mare with 8 foals or a stud with 150 foals. That randomness means marking down the previous AFPT is of little value. At least to me.
My studs are also all fairly similar in quality.
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Ok, I see what you mean. Makes sense
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If you wanted to truly compare mares you would ideally breed two mares to the same stud for multiple breedings. Then the mare who has the better AFPT is most likely your better breeder. Again there's that randomness element in breedings which makes it hard to say 100% for certain, but that would give you your best certainty.
Do I plan to do that for my mares? No. I feel satisfied with trying to keep similar quality stallions in a breeding group and calculating my mares' AFPT based on their breedings to that group of stallions.SALVISTAR PERFORMANCE HORSES
Barn ID - 2358