In the big-book era of Thoroughbred breeding, first-crop success for a young stallion is more important than ever. If a sire’s first 2-year-olds, which race during a stallion’s fourth season at stud, fail to win stakes races, the number of mares craters for season five, and in too many cases a stallion’s career is essentially over.

Stallions as good as Hill ‘n’ Dale Farm’s Curlin, whose fifth-crop number of foals dropped to 40 after his first juveniles failed to shine, can overcome early stumbles, but Hill ‘n’ Dale’s young sire Violence will not have that problem.

Grade 1 winner We Miss Artie will relocate to Ramsey Farm in Nicholasville, Ky., for the 2018 breeding season, when he will stand for an advertised fee of $5,000.

The 7-year-old son of Artie Schiller began his stud career at Colebrook Farms Stallion Station in Ontario, where he stood in 2017 for $3,000 Canadian. His first foals are yearlings of 2018.

Tu Brutus, a stakes winner on dirt in the U.S. and on turf in Chile, has been retired and will stand stud at Crestwood Farm in Lexington, Ky., trainer Gary Contessa said Wednesday.

Tu Brutus, a 6-year-old Chilean-bred son of Scat Daddy, made an auspicious U.S. debut, running second, beaten a half-length by Send It In, in the Grade 3 Excelsior Stakes at Aqueduct in April. Tu Brutus earned a 118 Beyer Speed Figure, the third-highest figure earned by any horse in 2017.

Grade 1 winner Power Broker has been exported to Saudi Arabia for the 2018 breeding season. The 8-year-old Pulpit horse previously resided at Hill ‘n’ Dale Farm, where he was advertised in 2017 for $3,500. His first foals are 3-year-olds of 2018.

Power Broker’s first crop featured 16 winners, with progeny earnings of $355,669.

Papa Clem, a Grade 2 winner, has been sold to stand at Karacabey Stud in Turkey for the 2018 breeding season.

The 12-year-old Smart Strike horse previously resided at Legacy Ranch in Clements, Calif., where he was advertised in 2017 for $2,000. He was a top-10 sire in California by progeny earnings in each of the past two years.

Grade 1 winner Mr. Sidney has been relocated to Beau Ridge Farm in Kearneysville, W.Va., for the 2018 breeding season and will stand for an advertised fee of $6,500.

The 14-year-old son of Storm Cat previously stood at Walmac Farm in Lexington, Ky., for $5,000. The Kentucky-bred Mr. Sidney began his stud career in France and returned to the U.S. to stand at Walmac for the 2015 season. His first foals as a domestic sire are 2-year-olds of 2018.

Grade 1 winner Harmonize has been retired and will be bred to More Than Ready for her first season as a broodmare.

Owner Larkin Armstrong announced the retirement of the Scat Daddy mare, whom he purchased for $80,000 as a Keeneland September yearling, on his Twitter account. He said that Harmonize, who he referred to as a "dream horse," would reside at Brookdale Farm in Kentucky.

Long Island Sound, who earned a Group 3 victory Ireland, will retire to Pleasant Acres Stallions in Morriston, Fla., for the 2018 breeding season, where he will stand for an advertised fee of $5,000.

The 5-year-old War Front horse won four of 10 starts for earnings of $213,315, headlined by a win in the Group 3 Paddy Power Diamond Stakes in Ireland. He also finished second in the Grade 1 Secretariat Stakes and third in the Group 3 Tercentenary Stakes in England.

Sassicaia, a Grade 3 winner and seven-figure auction graduate, has been retired from racing and will make his stallion debut at Elite Thoroughbreds in Folsom, La., for the 2018 breeding season.

The 7-year-old son of Bernardini will stand for $2,000.

Both the positives and negatives of the big book era of the Thoroughbred breeding industry can be read in the details of the stud career of 2004 Horse of the Year Ghostzapper. With the victory of his daughter Ghostly Presence in the Tropical Park Oaks on Saturday, Ghostzapper stands ninth on the 2017 general sire list, the fourth year in a row he will rank among the nation’s top 20 sires.