Studies were made on 1281 farm bulk tanks, selected at random in 29 states, to determine the amount of sediment in bulk farm milk. The studies showed excessive sediment; 10.7% of the bulk farm tanks had a sediment test grade of No. 4 (2.5 mg. or over); and 17.5% were grade No. 3 (1.0 to 2.4 mgs). As sediment testing of farm bulk milk is not practiced as a standard procedure, it is apparent that producers have become careless in controlling those factors which are important in keeping extraneous matter in milk to a minimum. Milk in a farm bulk tank can be tested for sediment regularly and with ease by the use of a one pint tester with agitated samples delivered to the milk plant laboratory by the hauler. Sediment tests graded No. 3 or No. 4 can be followed up by the fieldman. Tests can be made at the farm in the presence of the producer (using a bulk tank tester, now commercially available), and action may be taken if indicated.

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Author notes

1Presented at the 46th Annual Meeting of the International Association of Milk and Food Sanitarians, Inc., at Glenwood Springs, Colorado, August 26–28, 1959.