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

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Presentation transcript:

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

Council on Dairy Cattle Breeding, April 27, 2010 (2) Cole and Null Data First calving from January 1, 1997 to present Calving ages between 540 d (18 mo) and 1095 d (36 mo) The cow’s sire had to be ≥ 5 years old 8,234,537 HO first calvings 521,806 JE first calvings

Council on Dairy Cattle Breeding, April 27, 2010 (3) Cole and Null Model y = hys + a + e y = age at first calving in days hys = fixed effect of herd-year-season of birth a = random additive genetic effect e = random residual error

Council on Dairy Cattle Breeding, April 27, 2010 (4) Cole and Null Summary Statistics ― Cows currently milking Phenotypic Statistics BreedNMeanSDMinMax HO2,156, JE173, Genetic Statistics BreedNMeanSDMinMax HO2,154, JE173,

Council on Dairy Cattle Breeding, April 27, 2010 (5) Cole and Null Summary Statistics ― Active Bulls Genetic Statistics BreedNMeanSDMinMax HO JE

Council on Dairy Cattle Breeding, April 27, 2010 (6) Cole and Null Correlations TraitHOJE Milk Fat Protein SCS Daughter Pregnancy Rate Productive Life Cow Conception Rate Heifer Conception Rate Net Merit

Council on Dairy Cattle Breeding, April 27, 2010 (7) Cole and Null Correlations TraitHOJE Milk Daughter Pregnancy Rate Cow Conception Rate Heifer Conception Rate Size Composite Productive Life Net Merit Correlations among PTA for bulls with reliabilities of AFC ≥ 0.90.

Council on Dairy Cattle Breeding, April 27, 2010 (8) Cole and Null Correlations (continued) TraitHO Maternal Calving Ease0.22 Sire Calving Ease0.08 Maternal Stillbirth0.15 Sire Stillbirth0.04 Correlations among PTA for bulls with reliabilities of AFC ≥ 0.90.

Council on Dairy Cattle Breeding, April 27, 2010 (9) Cole and Null Heritability of Fertility Traits Traith2h2 Age at first calving0.027 Heifer conception rate0.010 Cow conception rate0.016 Daughter pregnancy rate0.040

Council on Dairy Cattle Breeding, April 27, 2010 (10) Cole and Null Genetic Trend for Age at First Calving

Council on Dairy Cattle Breeding, April 27, 2010 (11) Cole and Null Active HO Bulls With Reliability ≥ 90% NameAFC PTAAFC Rel ROSSDALE RUDY ANTONIO-ET JEWELED-ACRES SHARKY-ET O-BEE MANFRED JUSTICE-ET SANDY-VALLEY BOLTON-ET ART-ACRES WIN 395-ET NORZ-HILL FORM WIZARD-ET CEDARWAL APTITUDE KLUMBS DURHAM PONTIAC ROCKALLI BRADLEY EK-OSEEANA ASPEN-ET

Council on Dairy Cattle Breeding, April 27, 2010 (12) Cole and Null Active Jersey Bulls With Reliability ≥ 90% NameAFC PTAAFC Rel SUNSET CANYON MATINEE SUNSET CANYON RP MILITIA RICHIES JACE TBONE A WF BROOK BOMBER MILLSTREAM BELLRINGER O.F. MANNIX REBEL-ET MASON LEMVIG JACINTO-ET BW LEGION BW COUNTRY-ET SHF CENTURION SULTAN

Council on Dairy Cattle Breeding, April 27, 2010 (13) Cole and Null Conclusions Genetic differences exist among bulls Heritability higher than conception rate and lower than daughter pregnancy rate Heifers that are older at AFC have lower yield, lower longevity, and lower lifetime profit