Inborn Skills
To find the inbor skills of a foal you add the parents GP together. divide it by 10 and set that number aside. Then you add the parents BLUP together and divide it by 2 to get the average. Then you divide the average BLUP by 100. Then Multiply that number by the number set aside earlier, and that's roughly amount your foal's inborn skills.
If the number is less than 0, then the foal's inborn skills will be 0
so say
mum = 430 gp ~ 34 BLUP
dad = 400 gp ~ 100 BLUP
430 + 400 = 830
830 / 10 = 83
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34 + 100 = 134
134 / 2 = 67
67 / 100 = 0.67
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0.67 X 83 = 55.61
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Inborn Skills 55.61