Section 365IAC2-1-22. Evaluation of testing procedures

   It is required that all laboratories testing for pay purposes comply with the following:

(1) On a weekly basis, milk testing instruments used to determine the components in milk, for pay purposes, shall be checked against a set of at least twelve (12) standards representing a range of at least two and one-half percent (2.5%) through five percent (5%) butterfat.

(2) When variances are greater than those stated in this subdivision, they are excessive and the laboratory shall immediately take corrective action. These variances apply to all components being used to determine the payment price for milk from Indiana producers. For:

(A) butterfat, protein, or lactose:

(i) the standard deviation of duplicate samples must be less than two-hundredths percent (0.02%);

(ii) the mean deviation of duplicate samples must be less than two-hundredths percent (0.02%);

(iii) the standard deviation between machine readings and standard reference readings must be less than six-hundredths percent (0.06%); and

(iv) the mean deviation between instrument readings and standard reference readings must be less than five-hundredths percent (0.05%); and

(B) total solids:

(i) the standard deviation of duplicate samples must be less than four-hundredths percent (0.04%);

(ii) the mean deviation of duplicate samples must be less than three-hundredths percent (0.03%);

(iii) the standard deviation between instrument readings and standard reference readings must be less than twelve-hundredths percent (0.12%); and

(iv) the mean deviation between instrument readings and standard reference readings must be less than nine-hundredths percent (0.09%).

(3) The testing instruments must be adjusted to these accuracies before testing for pay determination is begun. Samples analyzed for pay purposes during periods in which excessive deviation occurred (as defined in subdivision (2)) shall not be used for pay determination. In those instances, use the next samples collected after the variation in the instrument has been corrected to determine the proper component tests to use for payment of the previous milk shipment.

(Creamery Examining Board; 365 IAC 2-1-22; filed Jun 20, 2001, 3:50 p.m.: 24 IR 3626; errata filed Sep 26, 2001, 9:38 a.m.: 25 IR 384; readopted filed Jul 15, 2008, 12:53 p.m.: 20080813-IR-365080121RFA; readopted filed Oct 23, 2014, 11:08 a.m.: 20141119-IR-365140351RFA)