The farm specialized in raising champion racehorses, and their most valuable asset was a proven broodmare.

该农场专门饲养冠军赛马，他们最宝贵的资产是一匹久经考验的种母马。

After a successful racing career, the mare was retired to become a broodmare.

在成功的赛马生涯之后，这匹母马退役成为一匹种母马。