Fonterra said it had acquired a 6 per cent holding in Australian dairy company, Bega Cheese - which is at the centre of a takeover battle for Warrnambool Butter and Cheese.
The 9.3 million shares were bought at A$4.95 per share for a total cost of A$46 million, the cooperative said.
"Australia is an important market for Fonterra, and we are committed to growing our already strong presence, "Fonterra chief executive Theo Spierings said in a statement.
He said the Australian dairy industry had been consolidating.
"It is important that Fonterra participates (in the consolidation), and we have confidence in Bega and the strategy it is pursuing," Spierings said.