II. Tests On Replicate Samples

Section C. Dairy Chemistry: Part I. General and Physical Chemistry

“…A.C. to ensure greater uniformity of testing, and that such work should then be followed by a survey of genuine herd milks designed to arrive at a more reliable and realistic mean A-value. Unfortunately, this course has not been adopted, and the survey (54,55,56) has been carried out without elimination of discrepancies between the results of the collaborating laboratories. As shown in the second part of the survey report (55), replication between laboratories was poor, and this makes it difficult to interpret the results for 1627 herd milks (mean A: 0-543° C.) which, taken at their face value, imply that there are marked regional differences throughout the U.S.A.…”

“…Unfortunately, this course has not been adopted, and the survey (54,55,56) has been carried out without elimination of discrepancies between the results of the collaborating laboratories. As shown in the second part of the survey report (55), replication between laboratories was poor, and this makes it difficult to interpret the results for 1627 herd milks (mean A: 0-543° C.) which, taken at their face value, imply that there are marked regional differences throughout the U.S.A. Whether these differences are of sufficient magnitude to consider regional standards of interpretation, as has been suggested, can hardly be decided before more precise results come to hand.…”