Agriculture Minister David Littleproud has commercial shares in Woolworths, it has been revealed after he urged Australians to avoid shopping at Coles and Aldi.

Mr Littleproud this morning slammed Coles and Aldi for not following Woolworths in dumping $1-a-litre milk offers in a bid to support desperate Australian dairy farmers.

“Publicity stunts like asking shoppers to donate at the counter to help struggling farmers are just a smokescreen to hide the fact they pay bugger all for milk,” he said in a statement.

Agriculture Minister David Littleproud's commercial shares in Woolworths have been revealed hours after he slammed Coles and Aldi for not dumping $1-a-litre milk prices. (AAP)

“The farmers wouldn’t need donations from the public if Coles and Aldi paid fair prices. Publicity stunts won’t change that.

Despite the public criticism however, it has now been revealed that Mr Littleproud declared shareholdings in Woolworths owned by both himself and his wife.

“I have 25 shares in Woolworths worth about $700. A simple google will reveal I’ve also bashed Woolworths, CBA, ANZ, and Telstra and I’ve got shares in them too. So long as Coles and Aldi refuse to be fair to farmers they can expect more heat from me,” he tweeted this afternoon.

9News understands Mr Littleproud owns the shares via his family trust and an investment trust.

While Woolworths yesterday announced it will be selling milk for an extra 10 cents a litre and giving the extra money to 450 farmers along the supply chain, both Aldi and Coles said they will not be increasing prices.

“The most meaningful and effective action ALDI can take as a grocery retailer in response to the difficult conditions that face many primary producers is to work with the suppliers with whom we have direct relationships,” Oliver Bongardt, Managing Director, Buying, ALDI Australia told 9Finance in a statement.

“Ensuring that we provide the lowest everyday prices to the Australian community is integral to our customer promise.

Mr Littleproud urged consumers to avoid Coles and Aldi after they refused to increase their milk prices in support of struggling dairy farmers. (AAP)

In a statement to nine.com.au, Coles also said it was “exploring additional options” but said a price increase could add to customers’ cost of living expenses.

“Coles is passionate about supporting our farmers and producers and in the past six months has committed $16 million to support this important industry.

“This includes contributing around $4 million to almost 640 dairy farmers through the Coles Dairy Drought Relief Fund and more than $7 million in partnership with the Country Women’s Association, resulting in over 2,300 additional grants for drought-affected farmers.

“Coles has been exploring additional options in relation to how to best support Australia’s hard working farmers, including how we ensure that drought assistance initiatives are as efficient and effective as possible.”

It has since been uncovered that Mr Littleproud and his wife own 25 shares in Woolworths, valued at about $700. (AAP)

Despite those statements, Mr Littleproud this morning publicly called for action against Coles and Aldi.

“Coles has said this since August so it’s now time to put up or shut up,” he said.

“Act like a decent corporate citizen instead of just pretending to.

“I encourage farmers to get out there in their local paper, radio or TV station and call this arrogant behaviour out. The Australian public deserves to know the truth.

“I also encourage Wesfarmers’ shareholders to contact Coles and let them know they don’t want to continue this approach of hurting farmers in private whilst handing them bouquets and small donations in public when the cameras are on.”