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The Kirstin Barclay and Paul "Tank" Ellis-trained 5yr-old was due to go out for a spell after the latest of his four emphatic career wins on Diamonds Day at Ascot Park, last month.
However, those plans were shelved after U May Cullect showed his trainers he had thrived after the race by charging around his paddock.
"Tank rung me the next day and said he was just going berserk around the paddock," Barclay said.
"His coat has brightened up and honestly he looks better."
U May Cullect made a late but brilliant start to his racing career as a 5yr-old after suffering two major tendon injuries.
The risk of the horse suffering another injury was a factor in Barclay and Ellis deciding to keep racing the Gotta Go Cullect pacer this season.
"He is just so well in himself and working so good," Barclay said.
"He is probably more likely to injure himself in the paddock than carrying on doing what we are doing."
Barclay and Ellis keep a close watch on U May Cullect's tendons with regular veterinary scans.
"We always do precautionary scans on him and he had one after that race the other day to keep an eye on things.
"Everything was the same, if not a little bit better.
"The vet's advice is to carry on doing what we are doing."
U May Cullect was nominated to race at Addington last night, but a healthy stake on offer at Winton made this afternoon's race more appealing.
The 5yr-old will compete in race 7, a rating 60-80 event over one mile (1609m).
Barclay and Ellis have a two-pronged attack on the event, with Paddyproudfoot also lined up to start.
The 4yr-old will face his toughest test yet after shooting up the grades following wins in his last two starts.
Barclay said she expected Paddyproudfoot to handle the rise in class well.
"He has got a really good turn of foot and he can stay, too.
"He will definitely handle the jump up."
Robyns Playboy and Born To Boogie look two of the toughest rivals for the Barclay-Ellis pair to beat this afternoon.
The Barclay and Ellis stable have a large nine-horse team entered at the Winton meeting.
Like Paddyproudfoot, Chuckles faces a step-up in grade after winning his last two starts.
Barclay said she also expects him to handle that rise when he starts in rating 55-59 company in race 9.
"He has got a really good turn of foot, his speed, I think, is one of his main factors.
"It is just a shame he has drawn out a bit, but if he can settle handy he certainly won't disgrace himself."
Miss Fandango looks one of Barclay and Ellis' best chances when she lines up in rating 40-45 company in race 5.
The 5yr-old must break a run of eight seconds and third placings for victory.
Barclay and Ellis also start Live On Suzie, Bettathanideal, Wee Man Trouble, Betterthanbrie and Hampton today, in a busy meeting for the pair.