John B. Cole and Daniel J. Null Animal Improvement Programs Laboratory Agricultural Research Service, USDA Beltsville, MD 20705-2350

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John B. Cole and Daniel J. Null Animal Improvement Programs Laboratory Agricultural Research Service, USDA Beltsville, MD Genetic Evaluation of Age at First Calving

National Association of Animal Breeders, April 20, 2010 (2) Cole and Null Data First calving from January 1, 1997 to present Calving ages between 540 and 1105 days The cows sire had to be at least 5 years old 8,193,513 first calvings

National Association of Animal Breeders, April 20, 2010 (3) Cole and Null Model y = hys + a + e y = age at first calving hys = fixed effect of herd-year-season of birth a = random additive genetic effect e = random residual error

National Association of Animal Breeders, April 20, 2010 (4) Cole and Null Summary Statistics ― Cows currently milking Phenotypic Statistics BreedNMeanSDMinMax HO2,148, JE173, Genetic Statistics BreedNMeanSDMinMax HO2,148, JE173,

National Association of Animal Breeders, April 20, 2010 (5) Cole and Null Summary Statistics ― Active Bulls BreedNMeanSDMinMax HO JE

National Association of Animal Breeders, April 20, 2010 (6) Cole and Null Correlations TraitHOJE Milk Fat Protein SCS Daughter Pregnancy Rate Productive Life Cow Conception Rate Heifer Conception Rate Net Merit

National Association of Animal Breeders, April 20, 2010 (7) Cole and Null Correlations (Continued) TraitHO Maternal Calving Ease0.228 Sire Calving Ease0.101 Maternal Stillbirth0.168 Sire Stillbirth0.048

National Association of Animal Breeders, April 20, 2010 (8) Cole and Null Variance Component Estimates HO Heritability = JE Heritability = 0.028

National Association of Animal Breeders, April 20, 2010 (9) Cole and Null Genetic Trend

National Association of Animal Breeders, April 20, 2010 (10) Cole and Null Genetic Trend

National Association of Animal Breeders, April 20, 2010 (11) Cole and Null Low Active HO Bulls NameAFC PTAAFC Rel STRAUSSDALE OS SHOWMAN-ET BADGER-BLUFF FANNY FREDDIE HURTGEN-VUE REALITY-RED GRAF-ACRES MORRELL-ET GG SPARTACUS WINNING-WAY MYLES-ET SANDY-VALLEY BOLTON-ET RAN-RUE COLUMBIA-ET SEAGULL-BAY DERRY ROSSDALE RUDY ANTONIO-ET

National Association of Animal Breeders, April 20, 2010 (12) Cole and Null High Active HO Bulls NameAFC PTAAFC Rel EK-OSEEANA ASPEN-ET EK-OSEEANA SG ALLEGIANCE-ET CLAYTOP ADDICTION-RED-ET EK-OSEEANA ABSOLUTE LEE-ET DEWDROP-MEDO MAPLE-ET PEACHEY LEE TITUS OPSAL WILSTAR BWM DORY-ET HEATHER HOLME VELVET EXODUS PRECEPTIVE-ET REGANCREST DELLSTAR-ET

National Association of Animal Breeders, April 20, 2010 (13) Cole and Null High and Low Active HO Bulls with > 90% rel NameAFC PTAAFC Rel SANDY-VALLEY BOLTON-ET ROSSDALE RUDY ANTONIO-ET O-BEE MANFRED JUSTICE-ET JEWELED-ACRES SHARKY-ET DE RITH CHASSEE KLUMBS DURHAM PONTIAC CEDARWAL APTITUDE ROCKALLI BRADLEY KINGS-RANSOM MTOTO DTOTO-ET EK-OSEEANA ASPEN-ET

National Association of Animal Breeders, April 20, 2010 (14) Cole and Null Low Active JE Bulls NameAFC PTAAFC Rel SUNSET CANYON MATINEE SUNSET CANYON RP MILITIA RICHIES JACE TBONE A DUTCH HOLLOW MISSILE-P-ET FANPER TACO TUESDAY F SUNSET CANYON MARINER-ET BHF-SSF PARADE LOUIE-ET OOMSDALE JACE GRAT GRIEVES-ET FOREST GLEN MECCAS JEVON-ET WF BROOK BOMBER

National Association of Animal Breeders, April 20, 2010 (15) Cole and Null High Active JE Bulls NameAFC PTAAFC Rel MAACKDAIRY REGION-ET VALLEYSTREAM JULIAN BOK B DANIEL LINETTE LUCKY NORSE STAR JACE TRIUMPH-ET BRIDON REMAKE COMERICA -ET SHF CENTURION SULTAN SCHULTZ DUDLEY RESTORE WF CENTURION SEIZE THE MOMENT-ET FOREST GLEN VD JADES JIMMIE-ET JENKS KHAN DO-ET

National Association of Animal Breeders, April 20, 2010 (16) Cole and Null High and Low Active JE Bulls with > 90% rel NameAFC PTAAFC Rel SUNSET CANYON RP MILITIA RICHIES JACE TBONE A WF BROOK BOMBER SUNSET CANYON MAXIMUS-ET FOREST GLEN AVERY ACTION-ET O.F. MANNIX REBEL-ET MASON LEMVIG JACINTO-ET BW LEGION BW COUNTRY-ET SHF CENTURION SULTAN