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Enhancing Test-Day Data Accuracy for Idaho DHIA: Key Field Supervisor Meeting Insights

Understand the crucial variables impacting test-day accuracy for Idaho DHIA dairy herds. Learn about milkings, supervisors, factors, and common inaccuracies to ensure reliable data. Discover how AIPL utilizes this information and best practices for precise data collection.

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Enhancing Test-Day Data Accuracy for Idaho DHIA: Key Field Supervisor Meeting Insights

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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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