Some mares are pregnant and the RSPCA says it is extremely concerned about their welfare.
His breeding operation, Darley, has bought eight farms in Japan, with 160 mares for breeding.
"There's some mares there, and he's extremely interested in the mares, " Richardson told ABC's Good Morning America.
Some people that buy are just collectors who want to buy the most elite mares out there.
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We've seen mares in the middle of giving birth and both the foal and the mare have died.
The foals that result from keeping the mares pregnant to produce the urine are often a disposable byproduct.
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Barbaro was trying to bite in his stall and even showing interest in a group of mares who stopped by to visit.
She liked Tapit's connections to the legendary broodmare La Troienne, and had successfully bred other mares to Tapit's father, the deceased Pulpit.
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The leased mares were boarded by ClassicStar which also selected the pairings.
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It will see a programme of seven top races in five categories - sprint, mile, middle distance, fillies and mares and long distance.
WinStar Farm has 140 mares, and they have 112 babies, and then I have about 70 horses in training, so about 300 all in.
And the three-year-old rounded the season off in style with victory in the Fillies and Mares Turf race at the Breeders' Cup in Texas.
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Another street will be called Paseo Ambos Mares, or "Both Seas Way" after the train that used to run from the Atlantic to Pacific coasts.
The Stubbs picture showed mares and foals against a landscape backdrop.
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This longer version first appears in William Mares' 1968 book Marine Machine, a non-fiction account of a platoon's basic training, according to Jonathan Lighter's Historical Dictionary of American Slang.
In the early 1990s, as executive vice president of American Home Products, he helped devise a strategy to defend the firm's Premarin hormone-replacement therapy--derived from pregnant mares' urine--against generic competition.
It involves the overbreeding of mares to produce hormone-rich urine which is one of the main ingredients in the hormone replacement brand Pfizer bought from Wyeth a couple of years back.
In the early 1990s, as executive vice president of American Home Products, he helped devise a strategy to fend off the firm's Premarin hormone-replacement therapy--derived from pregnant mares' urine--from generic competition.
Women are few and far between at most tracks, and some of the better-known tracks have begun to try to cultivate a female fan base, often anchored to a significant race for fillies or mares.
It is reported that the queen likes a travel rug round her knees and used to wear a hard hat when watching stallions cover her mares (now she stands on a viewing platform, after health and safety advice).
"For years they have searched for a way to remove the gamble inherent within breeding -- imagine, not having to fly mares all over the world, mating with all those different studs just trying to get the right results, " he said.
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