Otago saw the largest regional reduction of dairy cattle numbers last year, bucking the national trend.
Figures released by Stats NZ yesterday showed numbers increased 2% nationally, although not back to the 2014 level of 6.7million.
The North Island dairy herd increased by nearly 250,000 cows, led by a 5% increase in Waikato.
In contrast, the number of dairy cattle in the South Island fell more than 100,000 in the year to June 30. Otago's herd fell by 73,000, or 19%.
The increase in the national herd came at a time of subdued international milk prices and lower milk solid payouts.