Holstein Plaza

With the December 2014 national dairy genetic evaluations, USDA and the Council on Dairy Cattle Breeding (CDCB) introduced a new method of measuring Daughter Pregnancy Rate (DPR), along with other model enhancements. The old definition of DPR was number of Days Open, which was then converted to a pregnancy rate within a 21-day cycle. Days open was measured from the end of the voluntary waiting period to either a confirmed pregnancy or 250 days-in-milk. The new definition is an actual observation of pregnancy; a series of “no” or “yes” measures at 21-day intervals between 50 and 250 days in milk. Cows lacking pregnancy confirmation data at 250 days-in-milk are now assumed to be open. READ MORE