NEW YORK Treat Gently, a stakes winner in France, won her U.S. debut Thursday in the $48,000 allowance feature for fillies and mares on the turf at Belmont Park.

Pioneerof the Nile, winner of this year's Santa Anita Derby, has been retired from racing with an injury. According to a statement from Zayat Stables, the three-year-old colt has "a soft tissue injury to his left front leg."

ARCADIA, Calif. Kentucky Derby runner-up Pioneerof the Nile has been retired with a soft-tissue injury in his left front leg.

INGLEWOOD, Calif. The Inglewood City Council has approved a $2 billion development that would put an end to horse racing at the Hollywood Park racetrack.

Reigning champ Mast Track returns to defend his title in Saturday's $700,000 Hollywood Gold Cup at Hollywood Park. The 1 1/4 mile test on the track's all-weather surface has attracted a field of 13 older thoroughbreds.

LOUISVILLE, Ky. The Kentucky Derby will continue to thrive at Churchill Downs on the first Saturday in May. It's the rest of the year that's a problem for racing venues in the self-proclaimed "horse capital of the world."

Saturday's $175,000 Long Branch Stakes at Monmouth Park has attracted a field of eight three-year-olds for the final prep race before next month's $1 million Haskell Invitational.

The Kentucky Horse Racing Commission has suspended trainer Rick Dutrow 30 days after a horse he trained tested positive for twice the allowable level of Clenbuterol in 2008.

LEXINGTON, Ky. Kentucky Derby- and Preakness-winning trainer Rick Dutrow was suspended for 30 days on Tuesday for violating doping rules.

Monday was a work day for leading three- year-old filly Rachel Alexandra, while top sophomore gelding Mine That Bird was given an extra day off.

LAKE PLACID, N.Y. Boston Bruins executive Charlie Jacobs has won the Hermes Grandprix at the I Love New York Horse Show and his brother Lou took second.

LOUISVILLE, Ky. Mike Smith is back on Mine That Bird.

Chip Woolley, trainer of Kentucky Derby winner Mine That Bird, indicated Saturday that an announcement on a new rider for the three-year-old could come as soon as Sunday morning. Earlier in the week Calvin Borel was relieved of his duties with the gelding.

SANDOWN, England Sea The Stars has become the first horse in 20 years to add the Eclipse Stakes title to wins in the English Derby and the 2000 Guineas.

INGLEWOOD, Calif. Betting favorite Strawberry Tart made a late run and edged Jehan by a half-length to win the $100,000 Flawlessly Stakes at Hollywood Park on Friday.

LOUISVILLE, Ky. Backtalk stumbled out of the gate but charged past Flater Than Me and won by a length Saturday in the $110,500 Bashford Manor Stakes for 2-year-olds at Churchill Downs.

Two days after Arkansas Derby winner Papa Clem arrived at Monmouth Park for next month's Haskell Invitational. Belmont Stakes champ Summer Bird settled into his stall at the Jersey shore track.

Retired jockey Shane Sellers begins his return to the races tonight (Thursday) at Evangeline Downs in Louisiana. Sellers has been away from racing for 4 1/2 years due to a serious knee injury.

LOUISVILLE, Ky. A federal bankruptcy judge has closed the case of the Jockeys' Guild, ending the long-running court supervision of the riders' trade association.

The union of jockey Calvin Borel and Kentucky Derby champ Mine That Bird has come to an end. Borel has decided not to ride the three-year-old in the West Virginia Derby.

Arkansas Derby winner Papa Clem is on the grounds at Monmouth Park to begin his preparation for the track's signature event, the $1 million Haskell Invitational on Sunday, August 2. The colt arrived early Wednesday morning from California.

Following a one year absence the $300,000 Frank J. De Francis Dash is returning to the racing schedule at Laurel Park. The Maryland Jockey Club and the Maryland Thoroughbred Horsemen's Association have agreed to the live racing dates and stakes schedule for the remainder of 2009 in Maryland.

This past Saturday the top two distaff thoroughbreds in training each took to the track in competition within minutes of each other. That will probably be the closest the two females get to racing against one another.

LONDON Four-time Olympic show jumper Michael Whitaker has been suspended after his horse failed a drug test.

INGLEWOOD, Calif. Zenyatta improved her record to 11-0 Saturday, coming from off the pace to win the $300,000 Vanity Handicap by 2 1/2 lengths at Hollywood Park.

The country's top two female thoroughbreds, Rachel Alexandra and Zenyatta, each took to the track Saturday on opposite ends of the United States, minutes apart.

NEW YORK Rachel Alexandra may need to run against the boys just to find some competition.

NEW YORK Jess Jackson wasn't sure how much Rachel Alexandra's stirring victory against the boys in the Preakness took out of her, so he wound up keeping the superstar filly out of the Belmont Stakes.