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Ammit has built a great deal of life-like uncertainty into all aspects of this game, so there are no guarantees about the results of any match-up between a stallion and a mare. There are some guidelines that can be helpful in raising the chances of getting a foal which will be better than its parent of the same gender, but the potential range is broad. Years ago, a member performed an experiment breeding perfect foundations together. The PT range of their offspring stretched from 8.9 to 10.4. That's just the result for the PT of the foal. I haven't seen any statistics on the breeding ability of all foals from a similar cross.

That said, here are some breeding practices that may be helpful.

1. Breed horses that belong to the same generation together--foundation to foundation, 1st generation to 1st generation, etc. There is no game rule that prohibits breeding different generations, but there is a strong game-cultural prejudice against it. You are more likely to get neutered offspring when you do mix generations, so some people do it to increase/improve their show string. If you're trying for breeding stock or hoping to sell lots of foals, this practice might be something to adopt.

2. Breed horses of similar breeding ability to each other, regardless of generation. As your line extends to higher generations, you will find that the built-in range of possible results will give you offspring with a wide range of paper levels. Broadly speaking, there is some correlation between the paper levels of mares and stallions. In the table below, the stallion paper levels are on the left, the mare paper levels are on the right.

C -- Yellow
B -- Red
A -- Blue
*Star -- *Gold

Note that there is a fair range within most of these levels. This is easier to document with stallions than with mares because a stallion's paper level is known at birth/creation. A mare's paper level depends on the quality of her foals which is strongly affected by the ability of the stallions she is bred to and can change over time depending on the sires she has been bred to. Using the Comparison Test that rates one stallion's ability against that of another, I have found that one B papered stud, for instance may Comparison Test as "Superior" to another. A high B may test "about as good as" a low A. When you get to the very highest levels, *Star and *Gold, the range gets very, very broad, especially as the generations get higher and higher.

3. In all cases, one additional guide line, if both mare and stallion already have a number of living offspring, is to breed horses whose Average Foal PT is similar. Breeding a stallion whose AFPT is 10.3 to a mare whose AFPT is 11.9, for instance, is almost guaranteed to give you more neutered foals than intact ones. For this comparison, note that the larger the number of living foals, the more accurately the AFPT will be in predicting the result of the cross. HOWEVER, never forget that that built-in uncertainty. There are NO guarantees.

4. Check the pedigrees of the horses you want to cross. If the paper levels in the stallion's line, especially, seem to be static or uneven (fluctuating between higher and lower paper levels), you will know that this line is not advancing steadily in ability. The same thing holds with the mares, to some extent.