Maximum Likelihood Estimates of Parameters of First and Second Lactation Milk Records
- 1 June 1979
- journal article
- research article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 62 (6) , 990-995
- https://doi.org/10.3168/jds.s0022-0302(79)83360-3
Abstract
Variance and covariance components, heritabilities and genetic and phenotypic correlations between 1st and 2nd lactation milk records were estimated by Maximum Likelihood procedures. Data consisted of 423,314 1st records and 339,182 selected 2nd records completed in over 160,000 herd yr seasons from daughters of 1873 Holstein sires. Heritabilities of 1st and 2nd milk records were 0.41 and 0.35. Genetic and phenotypic correlations were 0.91 and 0.56. Computational practicality and bias in estimation by Maximum Likelihood were discussed.This publication has 12 references indexed in Scilit:
- Effects of Selection on Variances and Covariances of Simulated First and Second LactationsJournal of Dairy Science, 1979
- Simultaneous Estimation of Variance and Covariance Components from Multitrait Mixed Model EquationsBiometrics, 1978
- Multiple Trait Evaluation Using Relatives' RecordsJournal of Animal Science, 1976
- Maximum Likelihood Estimation of Variance Components in Dairy Cattle Breeding ResearchJournal of Dairy Science, 1976
- Effects of Selection Bias on Sire Evaluation ProceduresJournal of Dairy Science, 1976
- The Estimation of Variance and Covariance Components with an Application when Records are Subject to CullingPublished by JSTOR ,1973
- Estimation of Heritability and Repeatability of Milk and Milk Fat Production with Selection Effects RemovedJournal of Dairy Science, 1969
- Genetic and phenotypic parameters for the first three lactations in Friesian cowsAnimal Science, 1966
- The Estimation of Repeatability and Heritability from Records Subject to CullingBiometrics, 1961
- Estimation of Variance and Covariance ComponentsBiometrics, 1953