In total, there were 106 fewer producers registered in England and Wales at the start of February compared with the previous month.
Registrations are administered by the FSA for dairy hygiene inspection purposes, providing the best guide to overall producer numbers.
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In the four months since November 2018, 222 dairy farmers, equating to 2.4% of the industry, have quit the sector.
That figure compares with just 79 producers leaving the industry in the 12 months ending October 2018.
The monthly drop was so dramatic, AHDB Dairy said it was working with the FSA to see if something was distorting the statistics.
