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George R Wiggans
Animal Improvement Programs

Res Genet Anml
wiggans@aipl.arsusda.gov
Phone: (301) 504-8407
Fax: (301) 504-8092
Room 322
10300 BALTIMORE AVE
BLDG 005 BARC-WEST
BELTSVILLE, MD, 20705-2350

Project List

Publications
item Type Trait (Co)variance Components for Five Dairy Breeds- (28-Mar-04)
item Accounting for Differences in Rate of Maturity in Yield Evaluations- (23-Mar-04)
item Standardization of Lactation Records for Variance of Mendelian Sampling to Reduce Bias in Evaluations of Bull Dams- (22-Jun-03)
item Detection and Adjustment of Abnormal Test-Day Yields- (19-Mar-03)
item Calving Ease (Co)variance Components for a Sire-Maternal Grandsire Evaluation Model- (15-Dec-02)
item USDA Dairy Goat Genetic Evaluation Program - Status and Plans- (18-Oct-02)
item Comparison of Dystocia Evaluations from Sire and Sire-Maternal Grandsire Threshold Models- (19-Aug-02)
item Detection and Adjustment of Abnormal Test-Day Yields- (15-Apr-02)
item Deriving Lactation Yields from Test-Day Yields Adjusted for Lactation Stage, Age, Pregnancy, and Herd Test Date- (21-Nov-01)
item Genetic Selection: Evaluation and Methods- (13-Nov-01)
item Genetic Resources for Current and Future Development of Holstein-Friesian Dairy Cattle- (15-Mar-01)
item Genetic Evaluation of Yield and Type Traits of Dairy Goats in the United States- (03-Jan-01)
item Issues in Defining a Genetic Evaluation Model- (22-Oct-00)
item Genetic Evaluation of Yield and Type Traits of Dairy Goats- (26-Jul-00)
item Changes in Usda-Dhia Genetic Evaluations (November 1999)- (01-Nov-99)
item Impact on Calving Ease Evaluations of Excluding Herds with Abnormal Distribution of Scores- (23-Mar-04)
item Estimated Heterogeneity of Phenotypic Variance of Test-Day Yield with a Structural Variance Model- (20-Dec-03)
item Implementation of a Sire-Maternal Grandsire Model for Evaluation of Calving Ease in the Us- (16-Apr-03)
item Within Herd Effects of Age at Test Day and Lactation Stage on Test-Day Yields- (01-Apr-03)
item Enhancing Quality of Dystocia Data by Integration into a National Dairy Cattle Production Database- (19-Aug-02)
item Adjustment for Heterogeneous Genetic and Non-Genetic (Co)variance Structures on Test-Day Models Using a Transformation on Random Regression Effect Regressors- (26-May-02)
item Improvements in Dystocia National Genetic Evaluation System and Data Processing- (15-Apr-02)
item Estimating Effects of Permanent Environment, Lactation Stage, Age, and Pregnancy on Test-Day Yield- (07-Nov-01)
item Heterogeneity in (C0)variance Structures of Test-Day Yields- (30-Aug-01)
item Simultaneous Accounting for Heterogeneity of (Co)variance Components in Genetic Evaluation of Type Traits- (24-Jul-01)
item Variance of Effects of Lactation Stage Within Herd by Herd Yield- (24-Jul-01)
item Method to Establish Average Relationships among Holstein Bull Populations over Time- (24-Jul-01)
item Modeling Extended Lactation Curves in Dairy Goats Using Grafted Polynomials- (24-Jul-01)
item Impact of Paternity Errors in Cow Identification on Genetic Evaluations Andinternational Comparisons- (06-Jun-01)
item Revised Methods to Compute Multitrait Productive Life- (31-Jan-01)
item Estimation of Variance Components for Cow and Parity Effects from Test-Day Yields- (26-Jul-00)
item Collection, Validation, and Use of Test-Day Data for Genetic Evaluations- (26-Jul-00)
item State and National Standardized Lactation Averages by Breed for Cows Calving in 1998- (16-May-00)
item State and National Standardized Lactation Averages by Breed for Cows Calving in 1997- (08-Jun-99)
item Changes in Usda-Dhia Genetic Evaluations (February 1999)- (01-Feb-99)
item Relationships of Test-Day Somatic Cell Scores with Test-Day and Lactation Milk Yields- (17-Dec-03)
item Test-Day Milk Loss Associated with Elevated Test-Day Somatic Cell Score- (22-Jun-03)
item Heterogeneity of (Co)variance Components for Jersey Type Traits- (06-Jun-01)
item Indirect Estimation of (Co)variance Functions for Test-Day Yields During First and Second Lactations in the United States- (27-Nov-00)
item Joint Estimation of Variances and Effects in the Us Jersey Type Evaluation System- (22-Oct-00)
item Heterogeneity of (Co)variance Components for Jersey Type Traits- (26-Jul-00)
item Stability of Yield Evaluations for Holstein Bulls in Artificial Insemination Service- (26-Jul-00)
item Comparison of Genetic Evaluations of Culled and Surviving Cows- (26-Jul-00)
item Effect of Adjustment for Herd Test Day on Repeatability and Heritability of 305-Day Milk, Fat, and Protein Yields- (26-Jul-00)
item Multitrait Genetic Evaluation of Jersey Type with Integrated Accounting Forheterogenous (Co)variances- (14-May-00)
item Use of Sequential Estimation of Regressions and Effects on Regressions to Solve Large Multitrait Test Day Models- (07-Jan-00)
item Estimation of (Co)variance Functions of Test Day Yields in First and Later Lactations of United States Holstein Cows- (26-Aug-99)
item Current and Planned Changes in Usda-Dhia Genetic Evaluations (May 1999)- (23-Apr-99)
item Iterative Solution of Random Regression Models by Sequential Estimation of Regressions and Effects on Regressions- (18-Mar-99)
item National Survey of Herd Average Somatic Cell Counts on Dhi Test Days- (15-Dec-98)
item Quality of Data Included in Genetic Evaluations for Daughter Pregnancy Rate- (22-Jun-03)
item Herd and State Means for Somatic Cell Count for Dairy Herd Improvement- (07-Jun-00)
item Detection of Economic Trait Loci in the Us and Israeli Holstein Populationswith the Aid of DNA Microsatellites- (11-Jan-97)
item Development of a National Genetic Evaluation for Cow Fertility- (20-Jan-04)
item A Genome Scan for Qtl Influencing Milk Production and Health Traits in Dairy Cattle- (15-Oct-99)
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