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Lawrence Schaeffer

Research Profile

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Cattle

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Canada

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Publications

TOP 3
S Loker; Filippo Miglior; T F-O Neuenschwander; Lawrence R Schaeffer; C Bastin; Janusz Jamrozik; A Koeck; David F Kelton
Relationship between body condition score and health traits in first-lactation Canadian Holsteins.
S L Cartwright; E B Burnside; Lawrence R Schaeffer; B A Mallard
Adaptive immune response, survival, and somatic cell score between postpartum Holstein and Norwegian Red × Holstein first-calf heifers.
Janusz Jamrozik; Lawrence R Schaeffer
Alternative parameterizations of the multiple-trait random regression model for milk yield and somatic cell score via recursive links between phenotypes.

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All Publications

2012: S Loker; Filippo Miglior; T F-O Neuenschwander; Lawrence R Schaeffer; C Bastin; Janusz Jamrozik; A Koeck; David F Kelton
Relationship between body condition score and health traits in first-lactation Canadian Holsteins.
Journal of dairy science 2012;95(11):6770-80.
2012: S L Cartwright; E B Burnside; Lawrence R Schaeffer; B A Mallard
Adaptive immune response, survival, and somatic cell score between postpartum Holstein and Norwegian Red × Holstein first-calf heifers.
Journal of animal science 2012;90(9):2970-8.
2011: Janusz Jamrozik; Lawrence R Schaeffer
Alternative parameterizations of the multiple-trait random regression model for milk yield and somatic cell score via recursive links between phenotypes.
Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie 2011;128(4):258-66.
2011: S Loker; Filippo Miglior; C Bastin; Janusz Jamrozik; Lawrence R Schaeffer; A Sewalem; Vern Osborne
Short communication: estimates of genetic parameters of body condition score in the first 3 lactations using a random regression animal model.
Journal of dairy science 2011;94(7):3693-9.
2011: S L Cartwright; N Begley; Lawrence R Schaeffer; E B Burnside; Bonnie A Mallard
Antibody and cell-mediated immune responses and survival between Holstein and Norwegian Red × Holstein Canadian calves.
Journal of dairy science 2011;94(3):1576-85.
2010: Janusz Jamrozik; Lawrence R Schaeffer
Recursive relationships between milk yield and somatic cell score of Canadian Holsteins from finite mixture random regression models.
Journal of dairy science 2010;93(11):5474-86.
2010: Janusz Jamrozik; Lawrence R Schaeffer
Application of multiple-trait finite mixture model to test-day records of milk yield and somatic cell score of Canadian Holsteins.
Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie 2010;127(5):361-8.
2010: Janusz Jamrozik; Jarmila Johnston; Lawrence R Schaeffer
Selection of locations of knots for linear splines in random regression test-day models.
Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie 2010;127(2):87-92.
2010: Janusz Jamrozik; Jarmila Johnston; Lawrence R Schaeffer
Relationships between milk yield and somatic cell score in Canadian Holsteins from simultaneous and recursive random regression models.
Journal of dairy science 2010;93(3):1216-33.
2009: M Nixon; Jarmila Johnston; Janusz Jamrozik; Lawrence R Schaeffer; KJ Hand; Filippo Miglior
Genetic parameters of milking frequency and milk production traits in Canadian Holsteins milked by an automated milking system.
Journal of dairy science 2009;92(7):3422-30.
2009: S Loker; Filippo Miglior; Jarmila Johnston; Lawrence R Schaeffer; Janusz Jamrozik; GJ Kistemaker
Short communication: effect of preadjusting test-day yields for stage of pregnancy on variance component estimation in Canadian Ayrshires.
Journal of dairy science 2009;92(5):2270-5.
2009: S Loker; Filippo Miglior; Jarmila Johnston; Janusz Jamrozik; Lawrence R Schaeffer
Phenotypic analysis of pregnancy effect on milk, fat, and protein yields of Canadian Ayrshire, Jersey, Brown Swiss, and Guernsey breeds.
Journal of dairy science 2009;92(3):1300-12.
2008: Lawrence R Schaeffer; Janusz Jamrozik
Random regression models: a longitudinal perspective.
Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie 2008;125(3):145-6.
2008: M Sargolzaei; Flávio S Schenkel; Gerald B Jansen; Lawrence R Schaeffer
Extent of linkage disequilibrium in Holstein cattle in North America.
Journal of dairy science 2008;91(5):2106-17.
2008: M Heydarpour; Lawrence R Schaeffer; M H Yazdi
Influence of population structure on estimates of direct and maternal parameters.
Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie 2008;125(2):89-99.
2008: Janusz Jamrozik; J Fatehi; Lawrence R Schaeffer
Comparison of models for genetic evaluation of survival traits in dairy cattle: a simulation study.
Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie 2008;125(2):75-83.
2007: Davood Kolbehdari; Lawrence R Schaeffer; J A B Robinson
Estimation of genome-wide haplotype effects in half-sib designs.
Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie 2007;124(6):356-61.
2007: Valentina Palucci; Lawrence R Schaeffer; Filippo Miglior; Vern Osborne
Non-additive genetic effects for fertility traits in Canadian Holstein cattle.
Genetics, selection, evolution : GSE 2007;39(2):181-93.
2007: Janusz Jamrozik; J Fatehi; Lawrence R Schaeffer
Application of robust procedures for estimation of breeding values in multiple-trait random regression test-day model.
Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie 2007;124(1):3-11.
2006: Lawrence R Schaeffer
Strategy for applying genome-wide selection in dairy cattle.
Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie 2006;123(4):218-23.
2006: Davood Kolbehdari; Gerald B Jansen; Lawrence R Schaeffer; B O Allen
Transmission disequilibrium test for quantitative trait loci detection in livestock populations.
Journal of animal breeding and genetics = Zeitschrift für Tierzüchtung und Züchtungsbiologie 2006;123(3):191-7.
2005: Davood Kolbehdari; Gerald B Jansen; Lawrence R Schaeffer; Brian O Allen
Power of QTL detection by either fixed or random models in half-sib designs.
Genetics, selection, evolution : GSE 2005;37(6):601-14.
2005: R Barrett; Filippo Miglior; G Jansen; Janusz Jamrozik; Lawrence R Schaeffer
Joint international evaluation of Milking Shorthorn dairy cattle for production traits.
Journal of dairy science 2005;88(9):3326-36.
2005: V M Roso; Flávio S Schenkel; SP Miller; Lawrence R Schaeffer
Estimation of genetic effects in the presence of multicollinearity in multibreed beef cattle evaluation.
Journal of animal science 2005;83(8):1788-800.
2005: Janusz Jamrozik; J Fatehi; GJ Kistemaker; Lawrence R Schaeffer
Estimates of genetic parameters for Canadian Holstein female reproduction traits.
Journal of dairy science 2005;88(6):2199-208.
2004: B L Muir; J Fatehi; Lawrence R Schaeffer
Genetic relationships between persistency and reproductive performance in first-lactation Canadian holsteins.
Journal of dairy science 2004;87(9):3029-37.
2004: Janusz Jamrozik; Ismo Strandén; Lawrence R Schaeffer
Random regression test-day models with residuals following a Student's-t distribution.
Journal of dairy science 2004;87(3):699-705.
2002: Janusz Jamrozik; Lawrence R Schaeffer; K A Weigel
Estimates of genetic parameters for single- and multiple-country test-day models.
Journal of dairy science 2002;85(11):3131-41.
2002: Janusz Jamrozik; Lawrence R Schaeffer; K A Weigel
Genetic evaluation of bulls and cows with single- and multiple-country test-day models.
Journal of dairy science 2002;85(6):1617-22.
2002: Flávio S Schenkel; Lawrence R Schaeffer; Paul J Boettcher
Comparison between estimation of breeding values and fixed effects using Bayesian and empirical BLUP estimation under selection on parents and missing pedigree information.
Genetics, selection, evolution : GSE 2002;34(1):41-59.
2001: M F Luo; Paul J Boettcher; Lawrence R Schaeffer; J C M Dekkers
Bayesian inference for categorical traits with an application to variance component estimation.
Journal of dairy science 2001;84(3):694-704.
2000: B L Collard; Paul J Boettcher; J C M Dekkers; D Petitclerc; Lawrence R Schaeffer
Relationships between energy balance and health traits of dairy cattle in early lactation.
Journal of dairy science 2000;83(11):2683-90.
2000: Lawrence R Schaeffer; Janusz Jamrozik; GJ Kistemaker; BJ Van Doormaal
Experience with a test-day model.
Journal of dairy science 2000;83(5):1135-44.
1998: LK Jairath; J C M Dekkers; Lawrence R Schaeffer; Z Liu; E B Burnside; B Kolstad
Genetic evaluation for herd life in Canada.
Journal of dairy science 1998;81(2):550-62.
1997: Janusz Jamrozik; GJ Kistemaker; J C M Dekkers; Lawrence R Schaeffer
Comparison of possible covariates for use in a random regression model for analyses of test day yields.
Journal of dairy science 1997;80(10):2550-6.
1997: Janusz Jamrozik; Lawrence R Schaeffer; J C M Dekkers
Genetic evaluation of dairy cattle using test day yields and random regression model.
Journal of dairy science 1997;80(6):1217-26.
1997: Janusz Jamrozik; Lawrence R Schaeffer
Estimates of genetic parameters for a test day model with random regressions for yield traits of first lactation Holsteins.
Journal of dairy science 1997;80(4):762-70.
1996: Lawrence R Schaeffer; Janusz Jamrozik
Multiple-trait prediction of lactation yields for dairy cows.
Journal of dairy science 1996;79(11):2044-55.
1996: Lawrence R Schaeffer; R Reents; Janusz Jamrozik
Factors influencing international comparisons of dairy sires.
Journal of dairy science 1996;79(6):1108-16.
1995: R Reents; J C M Dekkers; Lawrence R Schaeffer
Genetic evaluation for somatic cell score with a test day model for multiple lactations.
Journal of dairy science 1995;78(12):2858-70.
1995: R Reents; Janusz Jamrozik; Lawrence R Schaeffer; J C M Dekkers
Estimation of genetic parameters for test day records of somatic cell score.
Journal of dairy science 1995;78(12):2847-57.
1994: Lawrence R Schaeffer
Multiple-country comparison of dairy sires.
Journal of dairy science 1994;77(9):2671-8.
1994: J S Tierney; Lawrence R Schaeffer
Inclusion of semen price of the sire in an animal model to account for preferential treatment.
Journal of dairy science 1994;77(2):576-82.
1993: E Ptak; H S Horst; Lawrence R Schaeffer
Interaction of age and month of calving with year of calving for production traits of Ontario Holsteins.
Journal of dairy science 1993;76(12):3792-8.
1991: Lawrence R Schaeffer
C. R. Henderson: contributions to predicting genetic merit.
Journal of dairy science 1991;74(11):4052-66.
1991: Janusz Jamrozik; Lawrence R Schaeffer; E B Burnside; B P Sullivan
Threshold models applied to Holstein conformation traits.
Journal of dairy science 1991;74(9):3196-201.
1989: K L Raheja; E B Burnside; Lawrence R Schaeffer
Relationships between fertility and production in Holstein dairy cattle in different lactations.
Journal of dairy science 1989;72(10):2670-8.
1989: K L Raheja; E B Burnside; Lawrence R Schaeffer
Heifer fertility and its relationship with cow fertility and production traits in Holstein dairy cattle.
Journal of dairy science 1989;72(10):2665-9.
1988: K Nadarajah; E B Burnside; Lawrence R Schaeffer
Genetic parameters for fertility of dairy bulls.
Journal of dairy science 1988;71(10):2730-4.
1984: T E Ali; E B Burnside; Lawrence R Schaeffer
Relationship between external body measurements and calving difficulties in Canadian Holstein-Friesian cattle.
Journal of dairy science 1984;67(12):3034-44.
1982: R A Westell; E B Burnside; Lawrence R Schaeffer
Evaluation of Canadian Holstein-Friesian sires on disposal reasons of their daughters.
Journal of dairy science 1982;65(12):2366-72.