Born into a horse racing family, his parents, Keith and Marilyn "Sis" Asmussen, are both trainers who operate El Primero Training Center off the Mines Road in Laredo, the seat of Webb County in south Texas.
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Zayat Stables has approximately 200 horses, most of which are in training spread among such trainers as Todd Pletcher, Bob Baffert, Steve Asmussen, Tony Dutrow, Mike Mitchell, Reade Baker, and Scott Lake.