Which preposition to use with milch

in Occurrences 1%

MARINIRTE (PICKLED) HERRING Take new Holland herring, remove the heads and scales, wash well, open them and take out the milch and lay the herring and milch in milk or water over night.

with Occurrences 1%

Put into bowl; mash the milch with a little mustard, 1 teaspoonful of sugar, pepper and salt.

Which preposition to use with  milch