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Thirty mares is plenty. I might even recommend half that many, if you start with PFs, RS, ExPros, anything with a known quality, if you're strict about offspring. :) If you aren't strict by quality, or if you want room to weed out mares, thirty is probably good.

What say everyone else?

You can always be adding to your herd of mares too, don't forget. Start with however many you have now / have the money and stall space for, and then you can evaluate at the end of each season whether you'd like more mares based on whether you have the money/stall space to keep the foals and whether you feel you're getting enough foals from that line with the number of mares you have.

Like Cheers, my goal is to have 50 mares per stallion for all my lines because I figure that's the best way to grow my line quickly because it'll get me more lined horses in the line (right now my struggle is principally getting enough fillies in each continuing generation).