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It will depend on what the other alleles at extension, agouti and silver for both horses.

If, and this is fairly unlikely, both horses gene tests show EE, AA, and ZZ, will get a silver bay every time.

If the one of them tests Ee, Aa, and Zz and the other tests EE, AA, ZZ, you will get a silver bay in the second generation.

EE, AA, ZZ -- silver bay
Ee, Aa, Zz -- silver bay
EE, Aa, ZZ -- silver bay
Ee, Aa, ZZ -- silver bay
EE, AA. Zz -- silver bay

If both of them test Ee, Aa, Zz, you will have a wide range of possibilities.

Sire: Ee, Aa, Zz x Dam: Ee, Aa, Zz

EE, AA, ZZ -- silver bay
EE. AA, Zz --silver bay
Ee, Aa, Zz -- silver bay
Ee, Aa, zz -- bay

EE, aa, Zz -- silver black
EE, aa, Zz -- silver black
Ee, aa, ZZ -- silver black
Ee, aa, zz -- black

ee, aa, Zz -- chestnut hiding silver
ee, aa, ZZ -- chestnut hiding silver
ee, aa, zz -- chestnut
ee, Aa, zz -- chestnut, with possibility of bay offspring
ee, AA, zz -- same as above
ee, Aa, Zz -- chestnut with possibility of bay or silver bay offspring
ee, Aa, ZZ -- same as above

I think that's right. It can be tricky finding all the possibilities when working with more than one gene at a time. *G*

You're right, Salvistar, other genes could indeed give other effects. If one of the parents was heterozygous for cream, it would have been identified as a silver buckskin, not a silver bay, however. Most of the color genes will affect the color name given to a horse unless they do not affect the base color of red or black. A black or bay horse can carry flaxen without showing it; a chestnut horse can carry silver without it showing, in both cases without affecting the color name. Hidden flaxen in both parents could result in a flaxen chestnut. If both parents carried DP and sooty, the result might be a liver chestnut, and so on.

Since Baya asked specifically what might result from a "silver bay/silver bay" cross, I just concentrated on the effects of those three genes. That puzzle was complicated enough, without postulating other genes that would not appear in the color name. ;)