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