Genetic parameters for test-day model with random regressions for production traits of Czech Holstein cattle

ZAVADILOVÁ, L., JAMROZIK, J. & SCHAEFFER, L.. Genetic parameters for test-day model with random regressions for production traits of Czech Holstein cattle. Czech Journal of Animal Science. 2005, roč. 50, č. 4, s. 142-154.
ZAVADILOVÁ, Ludmila, JAMROZIK, J. and SCHAEFFER, L. Genetic parameters for test-day model with random regressions for production traits of Czech Holstein cattle. Czech Journal of Animal Science, 2005, 50, 142-154. ISSN 1212-1819.
Year2005
CathegoryScientific publication in impacted journals
Internal link5053.pdf
Abstract

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, 44 207 and 11 266 test-day records in the first, second and third lactation, respectively. Milk, fat and protein in the first three lactations were analyzed separately and in a multiple trait analysis. Linear model included herd-test date, fixed regressions within age-season class and two random effects: animal genetic and permanent environment modeled by regressions.