A stablehand has denied trainer Peter Moody suggested a racehorse must have been given more of a hoof powder to explain his high cobalt reading.

Another stablehand also denied making up his evidence after the defence blamed him for mistakenly giving Lidari seven times the recommended quantity of oral hoof treatment, Availa, for months.

Moody's main feed manager Neil Alexander said he only ever fed Lidari or any other horse one scoop of Availa a day, whereas his assistant Rami Myala told a cobalt hearing he fed the horse two scoops of a morning and one of an afternoon.

Racing Victoria stewards' barrister Jeff Gleeson QC accused Alexander of telling lies, but the stablehand said he was confused when he told stewards last month the horse received two scoops of Availa a day.

"I have no reason to tell a lie," Alexander told the Racing Appeals and Disciplinary Board on Monday.

Gleeson said Alexander told a fib because Moody or someone on his behalf told the stablehand Lidari must have been getting more Availa than they thought.

Alexander said that did not happen.

"I can't recall anyone actually saying to me he was getting too much, this is why he got a high reading," he said.

Moody has denied suggesting to either stablehand that Lidari must have been given more Availa than was initially disclosed to stewards.

Myala said he clearly remembers giving Lidari two morning scoops of Availa and one in the afternoon in the lead-up to his second in the 2014 Turnbull Stakes.

Gleeson suggested Myala was not telling the truth and did not feed Availa to the horse at all nor give it that amount.

Gleeson said: "You're making this up Mr Myala."

Myala replied: "No sir."

Myala insisted he fed Lidari as he said.

"I remember 100 per cent. I say confidently I gave two scoops in the morning, one in the afternoon."

But the two stablehands gave conflicting evidence on some points including on Myala's claim Alexander told him to give Lidari that much Availa.

Alexander said he told Myala he gave all horses one Availa scoop once a day.

The RAD board will hear oral submissions on 18 February before deciding if Moody is guilty of administering a prohibited substance, which carries a minimum three-year disqualification.

Lidari, who was also given a vitamin injection the day before the Turnbull Stakes that was as usual prepared by Moody staff, recorded a cobalt level about two times the allowed threshold after the Group One race.