Measures of Fertility: Heritabilities and Genetic Correlations

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Measures of Fertility: Heritabilities and Genetic Correlations Paul VanRaden, Duane Norman, and Bob Miller Animal Improvement Programs Laboratory ARS, USDA, Beltsville, MD 20705-2350 paul@aipl.arsusda.gov

Analysis of Fertility Data Individual breeding (ERCR) data from 2,195,643 Holstein and 145,976 Jersey lactations initiated 1998 – 2000 3447 Holstein sires and 3440 mating bulls Cow and bull fertility evaluated separately Multi-trait REML sire model

Cow Fertility Trait Heritabilities Jersey Holstein Days to first breeding 4.0% 6.6% Days to last breeding 2.9 4.0 Number of inseminations 2.2 1.8 70-d non-return rate to first service 1.1 1.0 Gestation length 10.3

Correlations with Days to Last Breeding Traits (Holstein data) Phenotypic Genetic Days to first breeding .41 .85 Number of inseminations .76 .61 70-d non-return rate to first service -.32 -.21 Gestation length -.02 -.01

Bull Fertility Analysis Proportion of phenotypic variance was .5% for Holstein bulls, 1.2% for Jersey bulls Correlation of REML solutions with ERCR .71 for 446 bulls with > 300 services .83 for 212 bulls with > 1000 services .88 for 93 bulls with > 5000 services Age of bull and country effects were removed, but could be included in solutions

Reporting of Cow Fertility Reverse scale so positive is better? Set mean = 100 like some Europeans? Possible names and abbreviations DO Days Open DP Days Pregnant CF Cow Fertility DF Daughter Fertility R Reproduction

Conclusions Days to last breeding were most correlated genetically with days to first breeding (.85) Non-return rate and number of services were less correlated because of lower heritabilities Estimates similar to Weigel and Rekaya (2000) Estimated variance for Holstein bull fertility agrees with value used in ERCR evaluation since May 2000