Robbie Dunne (left) was found guilty on all four counts of conduct prejudicial to horse racing
Robbie Dunne has been banned for 18 months, with three months suspended, after he was found guilty of "bullying and harassing" fellow jockey Bryony Frost.
An independent panel found Dunne in breach of all four counts of conduct prejudicial to the reputation of horse racing.
Three charges of violent or improper conduct are yet to be considered.
The panel heard evidence over several days about a "weighing-room culture".
It followed charges brought by the British Horseracing Authority (BHA).
Brian Barker QC, the panel's chair, said that "deliberate conduct over a course of a significant period of time has been revealed".
Barker added that Dunne was guilty of "distasteful targeting, deliberate harassment on and off track, and occasional cases of dangerous bullying".
He said the panel had "real concern" about the weighing-room culture, which he said was "deep-rooted and coercive".
Frost thanked everyone who has supported her throughout the process.
"I wish now to take a few days to reflect on the outcome before I make any further comment," she added.
"I ask the media to please give me and the people closest to me a few days of privacy. I need to focus on my upcoming rides over the weekend."
The BHA said it "welcomes" the panel's decision and that Dunne's ban reflects "the seriousness of the accusations".
It added that it hopes this "ground-breaking" case could be a "catalyst for further change within the industry".
"It is essential that when something does go wrong that people feel that they can call out bad behaviour, and not be made to suffer in silence," the BHA said.
"By stepping forward to report the behaviour of which she was on the receiving end, Bryony Frost took a courageous step.
"We hope that others who may be in similar positions will feel comfortable doing the same.
"We must move forward from this case and define the sort of language and conduct that is acceptable in a place of work."
The BHA also asked that the "privacy and wellbeing" of both Dunne and Frost is "respected".
The Professional Jockeys Association (PJA) said it has "great sympathy" with Frost, who "felt bullied" and it "took courage" for her to go through this process.
It added that Dunne's conduct fell "well short of the standard" it expects.
However, the PJA strongly opposed the findings of the panel on the weighing-room culture and said it does not believe Dunne has been "subjected to a remotely fair process".
"It is a grossly inaccurate and wholly unfair representation of the weighing room and a conclusion we believe is at odds with the evidence presented," the PJA said.
"The BHA's stance is made worse by the fact that for years the PJA and its female members have been raising concerns with the BHA about the inadequate facilities for female riders and for years the BHA did nothing.
"We say it is no coincidence that the BHA has only shown an interest in driving change over the last few months in light of this case."
On the subject of whether Frost had been ostracised by some other jockeys and valets, the PJA said: "Whilst we do not doubt that Bryony felt isolated, there is a significant and important difference between feeling isolated and being ostracised."
The majority of the incidents in question took place in 2020, when Dunne was found by the panel to have threatened Frost by promising to "put her through a wing [of a fence]", while he was also accused of using misogynistic language towards her.
"We find that the words used on 3 September were, as a promise, to cause real harm - over and above the usual jockey mantra of 'murdering'," said Barker.
"On the examination of Ms Frost's evidence and demeanour we find her to be truthful, thoughtful and compelling.
"By taking her complaint to the authority she has broken the code [of the weighing room], knowing that her isolation - and rejection by some - was inevitable.
"In acknowledging after the Southwell race Mr Dunne believed that Ms Frost was the cause of his mount's death and that he had suffered a fall, we are unable to accept Mr Dunne's sweep of denials, criticisms and his reasons."
What evidence has been heard in this case?
Louis Weston, representing the BHA, said in his closing remarks that Dunne subjected Frost to a "vendetta".
The treatment of Frost, 26, by some colleagues since she made the complaint has been "outrageous", Weston said, and that Frost had been ostracised by some other jockeys and valets.
Weston has previously said Dunne, 36, threatened to cause Frost serious physical harm and also used "foul, sexually abusive and misogynistic language" towards her.
While giving evidence, Frost said Dunne had "opened his towel and shook himself" in front of her in the men's changing room, where female jockeys would sometimes go to collect kit.
Dunne said being naked was not a sexual act and could only recall being undressed in front of her when walking from the sauna to the weighing scales.
Roderick Moore, for Dunne, said in his closing remarks to the hearing that the BHA case was a "jigsaw puzzle with numerous missing pieces".
He said that Frost had experienced "issues" with three other senior jockeys and that a leak to the Sunday Times of the investigation report had "a massive effect on Mr Dunne's health and welfare".
Dunne had denied four charges of conduct prejudicial to horse racing, including bullying and harassing Frost, and two of the three counts of violent or improper behaviour.
Dunne has said he was using a "figure of speech" and not a "threat" when he told Frost he would put her through the side of a fence.
Weston questioned why other riders had not seen anything out of the ordinary from the exchange.
"If there is a weighing-room culture that allows one jockey to threaten another with serious harm to them and their horse, that culture is one that is sour, rancid and we say should be thrown out and discarded. It's had its time," he said.
He said racing "exerted a pressure on people who would otherwise speak freely".
'Hold tight and pretend it's a plan!': You can watch all the Doctor's latest adventures on BBC iPlayer
What would it be like to have Superman as a dad? Watch now as Clark Kent and Lois face their greatest test
