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Estimation of genetic parameters and evaluation of test-day milk production in sheep
dairy heritability model selection
2015/6/23
The fixed effects
were estimated by the least-squares method, while the genetic parameters were estimated by the REML
method. The data were tested by 49 models, but on the basis of the coefficient...
Genetic parameters of test-day somatic cell scores for the first three lactations of Polish Holstein-Friesian cattle
heritability genetic correlation somatic cell count dairy cattle
2015/6/9
Genetic parameters for somatic cell score in the first three lactations of Polish Holstein-Friesian cattle were estimated. A multiple-lactation model was applied with random herd-test-day effect, fixe...
Covariance components by a repeatability model in Slovenian dairy sheep using test-day records
milk traits genetic and environmental effects heritability
2015/6/8
The estimation of covariance components for daily milk yield, fat and protein content was performed in three Slovenian dairy sheep breeds (Bovec, Improved Bovec, and Istrian Pramenka). In the period 1...
Factors affecting milk yield and ewe’s lactation curves estimated with test-day models
Tsigai Improved Valachian Lacaune milk yield environmental effects lactation curve
2015/6/2
Test-day records of purebred Tsigai, Improved Valachian and Lacaune ewes were analysed with a general linear model in order to investigate the effects of flock-test day, lactation number, days in milk...
Bias in genetic evaluation using random regression test-day model
dairy cattle genetic evaluation test-day model heterogeneous variance empirical bias
2010/8/9
The effect of an upgraded Finnish evaluation model on bias in estimated breeding values for protein yield was investigated. Evaluations based on repeatability animal model and on random regression tes...
Definition of subgroups for fixed regression in the test-day animal model for milk production ofHolsteincattle in theCzech Republic
test-day model with random regression fixed regression subgroups lactation curves milk yield dairy cattle
2015/6/1
The investigation was based on roughly 3.9, 2.7 and 1.7 million test-day records from first, second and third lactation, respectively, sampled from 596 200 Czech Holstein cows between the years 1991 a...
Genetic parameters for test-day model with random regressions for production traits of Czech Holstein cattle
test-day yields random regression model genetic parameters Czech Holstein cattle
2015/6/1
Multiple-lactation random regression model was applied to test-day records of milk, fat and protein yields in the first three lactations of the Czech Holstein breed. Data included 9 583 cows, 89 584, ...