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Accurately Describing the Test-Day

Accurately Describing the Test-Day. Idaho DHIA Field Supervisor Meeting. Steven J. Sievert Technical Director, National DHIA Manager, Quality Certification Services Inc. . Important Variables to Describe. Milking Frequency What milkings are weighed? What milkings are sampled?

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Accurately Describing the Test-Day

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  1. Accurately Describing the Test-Day Idaho DHIA Field Supervisor Meeting Steven J. Sievert Technical Director, National DHIA Manager, Quality Certification Services Inc.

  2. Important Variables to Describe • Milking Frequency • What milkings are weighed? • What milkings are sampled? • Who did the work? • Supervisor? • Dairyman? • Partially Supervised Test? • Milking Times • Use of Electronic Meters or Portable Meters • Verification Test?

  3. How is this data used by DRPC and AIPL? • Proper A/P Factoring • Proper Calculation of Lactation Totals • Proper Data Collection Rating Calculation • Separate DCR for Milk and Components • Each cow gets her own DCR • Herd DCR is weighted average of individual cow DCRs • Potential inaccuracies noted in Idaho DHIA herds

  4. Looking at AIPL Test-Day Characteristics

  5. Potential Inaccuracies Errors in reporting: • Milkings weighed • Milkings sampled • EMM use • Recording days

  6. Potential Inaccuracies Errors in reporting: • Milkings weighed • Milkings sampled • EMM use • Recording days

  7. Entering Test-Day Characteristics Correctly • Milking Frequency • Who did the work • Milking Times • Which milkings weighed • Which milkings sampled • Milk Shipped weights • Comments to DRPC • Test Plan • Make sure test plan is right • Use test plan that describes the majority of test days • Herd Code/Name What to Change if Needed What not to Change

  8. What about Factoring? • Two Types of Factoring • Factor to Milk Shipped weights • A/P factoring • Field Technicians should NOT be factoring milk weights at the farm! • DRPC are responsible for proper A/P factoring • DRPC have formula to factor for milking periods longer than 24 hours (i.e. is take 26 hour to complete three milkings)

  9. Why desire to factor at the dairy? • Dairyman wants test day weight to match milk shipped weights • Dairyman wants 24-hr weight before supervisor leaves farm • Dairyman wants 24-hr component results from laboratory quickly

  10. Concerns about field supervisor factoring • Did you start with accurate milk shipped weights? • Did you use the correct A/P factors? • Different factors in different computer programs • Simple factoring (milk weight x 3) – WRONG! • Different factors for yield and components • Are the weights factored more than once? • I have seen milk weights factored on the dairy, then factored by field tech and a third time by the DRPC • Are factored weights/components reported to DRPC as weighed/sampled from all milkings? • Inaccurate reporting and inflated DCR

  11. Questions?

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