Hi Galejade,
You've done an excellent job of explaining my invention (thanks).
On the specific case of inbreeding to Mr Prospector though it should be noted that the most important weakness of VGS Program currently is inbreeding…
You see, in the case of Mr Prospector there's a perception amongst many breeders that inbreeding to him is bad and as a result many of them avoid the pattern.
The VGS doesn't take this into account currently because we haven't yet reached a point where it can adjust for How Many Specific Jumps a cross has had... And as a result we probably shouldn't jump to too many conclusions in regards to Mr P inbreeding (I'm not saying Inbreeding Avoidance entirely explains the low score but research done by someone I know into the number of times it's been tried indicate there's been great avoidance of Mr P inbreeding).
In contrast to Mr P inbreeding (which has a pretty good excuse which
may explain the low score); the Mr P/Hyperion cross has a very low score relative to the HUGE sample size even though it doesn't involve inbreeding.
Therefore, I'd say the Mr P / Hyperion cross is something to avoid, generally speaking (I'll admit the Goldmine Program only counts crosses where the two ancestors are within 5 generations so a further back cross of Hyperion in your mare might not preclude her as a good mate for the right kind of Mr P descended stallion; but still the overall negativeness of the cross is something to bear in mind and you would be well advised to see how well Mr P has done with the source[s] of Hyperion in your mare via the Goldmine Program and the VGS)...
I would like to know Ilbean's numbers for the most successful means of linebreeding Mr. P - that which has Fappiano as one of the conduits.
What do those numbers look like?
Excellent question Roving Boy,
The Fappiano / Mr Prospector cross was predicted to get 9.26 G1Ws and actually got 8, which gives it a VGS of
0.89.
Given that Fappiano descendants are probably crossed less with other Mr P descendants due to inbreeding avoidance; this is a nice result.
Still, it's worth noting that inbreeding to Mr P through Fappiano (B. 1977) is avoided less than nearly all other forms of Mr P inbreeding due to Fappiano showing up far enough back in a lot of pedigrees and that the intensity of the inbreeding involved in crossing him with his sire is thus less frightening to quite a few breeders.
In contrast, Gone West (B. 1984) somehow manages to get a VGS of
1.01 crossed with his sire in spite of his being born recently enough that he's usually the sire or grandsire of his descendants (which means crossing him and Mr P would result in a 2x? or 3X? intensity of inbreeding that most people avoid).
-Michael
This is more useful than nicking reports. I'm guessing there is a charge for Ilbean's services? Would you go so far to say that inbreeding to Mr. P is a bad idea or perhaps should be avoided?