Genetics of Reproduction in Primiparous Holsteins
Open Access
- 1 January 1989
- journal article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 72 (1), 194-201
- https://doi.org/10.3168/jds.s0022-0302(89)79097-4
Abstract
Effects of genetics and relationships between yield and days from parturition to first service, first service conception rate, number of services, and a reproductive performance code based on several reproductive components were investigated in primiparous Holsteins. Recorded breedings and DHI production records were from 3393 daughters of 174 bulls in six experimental herds. Subsets included progeny of 78 sires, with greater than or equal to 5 daughters calving in April through July (n = 817) and August through March (n = 1162). Daughter-dam regressions (n = 2593 pairs) and paternal half-sibs were used to estimate heritabilities of fertility traits and associations between yield and reproduction. Results showed increased FCM was associated with lowered fertility. For paternal half-sibs, the greatest antagonism was between conception rates and FCM (rG = -.65 +/- .10). Daughter-dam regressions estimated a favorable genetic correlation of .43 +/- .32 between conception rates and yield. Heritabilities were highest for April through July calvings and ranged from .08 +/- .10 for first service conception to .24 +/- .12 for reproductive code. Correlations between sire least squares constants from warmer and cooler calving seasons were lower than heritabilities of traits would suggest.Keywords
This publication has 20 references indexed in Scilit:
- Environmental and Yield Effects on Reproduction in Primiparous HolsteinsJournal of Dairy Science, 1988
- Comparison of Heritability Estimates from Daughter on Dam Regression with Three Models to Account for Production Level of DamJournal of Dairy Science, 1986
- Profitability in Daughters of High Versus Average Holstein Sires Selected for Milk Yield of DaughtersJournal of Dairy Science, 1985
- Impact of Culling on Sire Evaluation by Mixed Model ProceduresJournal of Dairy Science, 1983
- Yield and Fertility Relationships in Dairy CattleJournal of Dairy Science, 1983
- Genetic Aspects of Milk Yield and Reproductive PerformanceJournal of Dairy Science, 1981
- Health Care Requirements of Dairy Cattle. I. Response to Milk Yield SelectionJournal of Dairy Science, 1979
- Inheritance of Fertility in Cattle Inseminated ArtificiallyJournal of Dairy Science, 1969
- Genetic Relationship Between Production and Breeding EfficiencyJournal of Dairy Science, 1966
- Estimation of Variance and Covariance ComponentsBiometrics, 1953