ATCP 65.86(3)(d)2.a.a. A daily reference check shall be conducted before each day’s testing, at the same time that the dairy plant operator conducts the daily performance check under par. (c). The daily reference check shall be conducted, for each relevant milk component by a tester who is licensed under s. 97.17 or 98.145, Stats., to operate the testing device.
ATCP 65.86(3)(d)2.b.b. To perform a daily reference check, a tester shall perform 10 tests on a reference sample. The reference sample may be a homogenized milk sample prepared by the dairy plant operator, or it may be a daily performance check sample obtained from a sample provider approved by the department under par. (c) 4. The 10 test results shall be averaged and the average result shall be used as a comparison value for the hourly reference checks under subd. 3.
ATCP 65.86(3)(d)3.3. An hourly reference check required under subd. 1 shall be done in accordance with all of the following requirements:
ATCP 65.86(3)(d)3.a.a. An hourly reference check shall be conducted for each milk component before each hour’s testing for that component. To conduct an hourly reference check, a tester shall test the same reference sample used for the daily reference check under subd. 2.
ATCP 65.86(3)(d)3.b.b. For each relevant milk component the hourly reference check result shall be compared to the average result obtained on the daily reference check under subd. 2. If an hourly reference check result differs from the average result on the daily reference check by more than 0.034% for milkfat or protein or 0.064% for total solids or solids-not-fat, the testing device shall not be used until the condition causing the difference is found and corrected. Test results obtained before the device is corrected, and after the last previous conforming reference check, shall not be used in determining the amount paid to milk producers.
ATCP 65.86(3)(e)(e) Calibration and daily performance check samples; milkfat contents.
ATCP 65.86(3)(e)1.1. The provider of a calibration sample under par. (b) or a daily performance check sample under par. (c) shall determine the known percentage content of milkfat in that sample by averaging the results of 3 milkfat tests using a method specified under subd. 4. The percentage milkfat results from those 3 milkfat tests shall not vary by more than 0.034 percentage points.
ATCP 65.86(3)(e)2.2. The known milkfat content of a calibration sample, expressed as a percentage of the sample weight, shall be at least 2.5%. Within a set of calibration samples, the difference in known milkfat content between the lowest milkfat sample and the highest milkfat sample, expressed as a percentage of average sample weight, shall be at least 2.5%.
ATCP 65.86(3)(e)3.3. The known milkfat content of a daily performance check sample, expressed as a percentage of the sample weight, shall be at least 2.8%. Within a set of daily performance check samples, the difference in known milkfat content between the lowest milkfat sample and the highest milkfat sample, expressed as a percentage of average sample weight, shall be at least 1.5%.
ATCP 65.86(3)(e)4.4. To determine the milkfat content of a calibration sample or daily performance check sample, the sample provider shall use either a manual or robotic version of the Modified Mojonnier method as described in the ”Official Methods of Analysis of AOAC International,” 18th edition (2005), section 989.05.
ATCP 65.86 NoteNote: The “Official Methods of Analysis of AOAC International,” 18th edition (2005), is on file with the division and the legislative reference bureau, and may be obtained from AOAC International, 2275 Research Blvd., Rockville, MD 20850, website https://www.aoac.org .
ATCP 65.86(3)(f)(f) Calibration and daily performance check samples; protein contents.
ATCP 65.86(3)(f)1.1. The provider of a calibration sample under par. (b) or a daily performance check sample under par. (c) shall determine the known percentage content of protein in that sample by averaging the results of 3 protein tests using the method specified under subd. 3. The percentage protein results from those 3 tests shall not vary by more than 0.034 percentage points.
ATCP 65.86(3)(f)2.2. The known protein content of a calibration or daily performance check sample, expressed as a percentage of sample weight, shall be at least 2.7%. Within a set of calibration samples, the difference in known protein content between the lowest protein sample and the highest protein sample, expressed as a percentage of average sample weight, shall be at least 0.7%. Within a set of daily performance check samples, the difference in known protein content between the lowest protein sample and the highest protein sample, expressed as a percentage of average sample weight, shall be at least 0.5%.
ATCP 65.86(3)(f)3.3. To determine the protein content of a calibration sample or daily performance check sample, the sample provider shall use the traditional or block digester/steam distillation Kjeldahl method as described in the “Official Methods of Analysis of AOAC International,” 18th edition (2005), section 991.20.
ATCP 65.86 NoteNote: The “Official Methods of Analysis of AOAC International,” 18th edition (2005), is on file with the division and the legislative reference bureau, and may be obtained from AOAC International, 2275 Research Blvd., Rockville, MD 20850, website https://www.aoac.org .
ATCP 65.86(3)(g)(g) Calibration and daily performance check samples; total solids.
ATCP 65.86(3)(g)1.1. The provider of a calibration sample under par. (b) or a daily performance check sample under par. (c) shall determine the known percentage content of total solids in that sample by averaging the results of 3 total solids tests using the method specified under subd. 3. The percentage total solids results from those 3 tests shall not vary by more than 0.054 percentage points.
ATCP 65.86(3)(g)2.2. The known total solids content of a calibration or daily performance check sample, expressed as a percentage of sample weight, shall be at least 11%. Within a set of calibration samples, the difference in known total solids content between the lowest total solids sample and the highest total solids sample, expressed as a percentage of average sample weight, shall be at least 2.00%. Within a set of daily performance check samples, the difference in known total solids content between the lowest total solids sample and the highest total solids sample, expressed as a percentage of average sample weight, shall be at least 1.5%.
ATCP 65.86(3)(g)3.3. To determine the total solids content of a calibration sample or daily performance check sample, the sample provider shall use the direct forced air oven drying method as described in the “Official Methods of Analysis of AOAC International,” 18th edition (2005), section 990.20.
ATCP 65.86 NoteNote: The “Official Methods of Analysis of AOAC International,” 18th edition (2005), is on file with the division and the legislative reference bureau, and may be obtained from AOAC International, 2275 Research Blvd., Rockville, MD 20850, website https://www.aoac.org .
ATCP 65.86(3)(h)(h) Calibration and daily performance check samples; solids-not-fat. The provider of a calibration sample under par. b or a daily performance check sample under par. (c) shall calculate the known percentage content of solids-not-fat in that sample by subtracting the percent milkfat as determined under par. (e) from the total solids for that sample as determined under par. (g). The calculation method shall be that described in the “Official Methods of Analysis of AOAC International,” 18th edition (2005), section 990.21.
ATCP 65.86 NoteNote: The “Official Methods of Analysis of AOAC International,” 18th edition (2005), is on file with the division and the legislative reference bureau, and may be obtained from AOAC International, 2275 Research Blvd., Rockville, MD 20850, website http://www.aoac.org .
ATCP 65.86(3)(i)(i) Automated testing devices; constant voltage. A constant voltage regulator shall be connected to, or form a part of, every milk component testing device that is in line with a single phase 115 or 220-volt power supply.
ATCP 65.86(3)(j)(j) Records related to calibrations, daily performance checks, and reference checks.
ATCP 65.86(3)(j)1.1. A dairy plant operator shall keep a record of every calibration, performance check, or reference check conducted on a milk component testing device under this section.
ATCP 65.86(3)(j)2.2. Every record required under subd. 1 shall be signed by the licensed tester who made the record. Calibration records shall be kept separate from performance check and reference check records.
ATCP 65.86(3)(k)(k) Accuracy of devices; division audit. The division may audit the accuracy of milk component testing devices using test samples prepared by the division under pars. (e) to (h).
ATCP 65.86 HistoryHistory: CR 14-073: cr. Register August 2016 No. 728, eff. 9-1-16; correction in (3) (c) 3. made under s. 35.17, Stats., Register August 2016 No. 728.