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Genetic parameters for test day milk yields of Holstein Friesian cows have been estimated using a randomregression model (<b>RRM</b>). Data consisted of 1487 monthly test day milk yield records of cows calving between1987 and 1993 in Sarmısaklı Farm, Turkey. Data were restricted to have at least 150d and at maximum 308dlength of first lactations.  Additive genetic and permanent environmental (co)variances were modeled with the same order polynomialregressions. Residual (measurement) error variance was assumed to be constant throughout lactation. Thequadratic (k=3) order orthogonal polynomial regression was found to be sufficient. Heritability estimates for testday milk yields were high at the middle of the lactation and ranged from 0.07 to 0.32. Genetic correlations ofmilk yields between consecutive test days were high, but decreased as the interval between tests days increased.Genetic correlations ranged from 0.51 to 0.99. Residual error variance was estimated 13.77 kg

Estimates of genetic parameters for test day milk yields of a Holstein Friesian herd in Turkey with random regression models