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The Sampling of Freshly Drawn Milk for Cow-Testing Association Work¹

Research Laboratories, Dairy Division, Bureau of Animal Industry, United States Department of Agriculture, Washington

ABSTRACT

The results of the experiment show that the use of the milk thief is time-consuming and unnecessary and in sampling freshly drawn milk.

The error introduced by taking equal instead of aliquot parts of the morning's and night's milk to make up the composite sample is probably too small to be of consequence in cow-testing work.

A representative sample may be obtained from freshly drawn milk by simply pouring it once, i.e., from the milking pail into the shot-gun can.

Freshly drawn low fat milk may stand for a half-hour before the upper layer has appreciably increased in fat. High fat milk must be sampled immediately. The results show that five minutes are sufficient for the fat in the upper layer to increase very perceptibly.

¹ Published by permission of the Secretary of Agriculture.