descendants of Antagonist xx

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broodmare Rivalry xx (Thoroughbred, 1920, from Antagonist xx)

Rivalry xx
gender-female
1920

Antagonist xx / Martian xx

broodmare Scrimmage xx (Thoroughbred, 1917, from Antagonist xx)

Scrimmage xx
gender-female
1917

Antagonist xx / Treadmill xx