In December, collection reached 13 million/kgMS, down 18.2 per cent.
"High input costs and poor seasonal conditions continue, resulting in increased cow cull rates, decreasing the season's milk production," Fonterra said.
The latest forecast from the Australian Bureau of Agricultural and Resource Economics and Sciences is for milk production to fall by 4 per cent to a 20-year low this season.
Fonterra also said more than 500 McDonald's restaurants across China now serve New Zealand sourced product for soft serve ice cream.
"McDonald's China chose to source milk powder from Fonterra to make their vanilla ice cream after our product received the highest sensory score - flavour, colour, stability - in their pilot," said the head of Fonterra Greater China, Christina Zhu.
According to Fonterra, China is the world's biggest ice cream market, consuming around 4.3 billion litres in 2016.