The dam of Group III winner Col 'n' Lil, Street Cry (IRE) mare Jyler is one of those mares to test positive.
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He won as a two-year-old, collected Group honours as a three-year-old and continued to record black type success as a four-year-old at Flemington.
His biggest win came in the Group III GCTC Gunsynd Classic (1800m) by two lengths from multiple Group performer Upham.
A half-brother to Group placed Octane Flyer, Worthy Cause comes from the family of top class Group I winning sprinter / milers Referral and Singing the Blues and champion galloper Shogun Lodge who won the Group I AJC Epsom Handicap, Queen Elizabeth Stakes and George Main Stakes earning over $4.6 million in prizemoney.
Worthy Cause will seek to add further success to Choisir's growing reputation as a sire of sires, his sons at stud including the Group I producing Starspangledbanner as well as Group I winning sons such as Olympic Glory (IRE), The Last Lion (IRE) and Divine Prophet.
Worthy Cause stands at a fee of $5,500.