Dairy Australia is predicting Australian milk supply could plummet by as much as 7% this season in a "worst case scenario".
If that eventuated, it would bring the national milk pool to a two-decade low of 8.6 billion litres and lead to extensive pressure across local supply chains, Rabobank's latest Agribusiness Monthly said.
That was in stark contrast to production conditions in New Zealand, where milk collections continued to pour in, leading to national supply climbing almost 6% for the first four months of the 2018-19 season to September 2018.
With weather conditions and pasture growth largely favourable in October, milk collections across the peak supply month were expected to remain elevated compared to the previous year.
International guidance suggested a 88% chance of El Nino conditions developing for the tropical Pacific over the coming months to January.