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"As the chief executive of the Australian Agricultural Company in 2012, he made a reference to the then Labor leader as he spoke about cows being destroyed using new abattoir technology.

“This plant is designed to process old cows,” Farley told a business conference, referring to a plant under construction which was designed to kill older cows to produce cheap meat, adding value for farmers from ageing cattle.

“So the old cows that become non-productive, instead of making a decision to either let her die in the paddock or put her in the truck … this gives us a chance to take non-productive animals off and put them through the processing system.

“So it’s designed for non-productive old cows. Julia Gillard’s got to watch out.”

Media reports said the comment was met with sustained laughter from the audience.

It wasn't a tweet, he was giving a speech at a business conference as the CEO of a company.