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Update on Evaluations for Daughter Pregnancy Rate

This update on daughter pregnancy rate evaluation includes data from 1995 onwards, covering parity pre-adjustments initiated in May 2003. It discusses the average breed effects across regions and time by calving month conversion to bull base. Future directions include the integration of pregnancy rate in Net Merit, early use of fertility records in lactation, and the enhancement of the fertility database.

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Update on Evaluations for Daughter Pregnancy Rate

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  1. Update on Evaluations for Daughter Pregnancy Rate

  2. Average Breed Effects Across Regions and Time by Calving Month

  3. Conversion to Bull Base (1995)

  4. Parity Pre-Adjustments Initiated May 2003

  5. Pregnancy Rate Evaluation • Lactations 1-5 beginning with 1960 • Data sources • Reported DO confirmed with next calving • Reported DO if no next calving • Calving interval – 280 days if no reported DO • Assigned DO = 250 if sold for infertility • Pregnancy verification codes used to allow earlier use of information

  6. Sources of Fertility Data 1998-1999

  7. Future Directions Pregnancy rate will be included in Net Merit. Fertility records will be used earlier in lactation. DPR can be used in multi-trait PL. Fertility database will be improved.

  8. Format 5 - Reproductive Records • Fixed segment identical to format 4 • Animal ID, sire ID, dam ID, X-ref ID • Animal herd code information • 20 reproductive segments: • Date of event, code for actual or estimated date • Includes many events, service sire ID

  9. Format 5 - Reproductive Event Codes H = Observed in estrus (heat) but not inseminated S = Synchronized estrus event (injection or other methods) A = Artificial insemination N = Natural service breeding E = Embryo donation

  10. Format 5 - Reproductive Event Codes Continued I = Embryo implantation P = Confirmed pregnant O = Confirmed not pregnant (open) X = Cow given a “do not breed” designation D = Delete event(s) for this “date of event”

  11. Format 5 in the Future: • Separate estrus expression and conception rate (female fertility) • Service sire fertility (male fertility) • Keep track of ALL service sires, number and type of services, not just the most recent

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