TY  - JOUR
T1  - Heterogeneity of Residual Variances of Test Day Milk Yields Estimated by Random Regression Model in Turkish Holsteins
AU - , C. Takma AU - , Y. Akbas 
JO  - Journal of Animal and Veterinary Advances
VL  - 8
IS  - 4
SP  - 782
EP  - 787
PY  - 2009
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2009.782.787
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2009.782.787
KW  - Heterogeneity
KW  -residual variance
KW  -random regression model
KW  -test day milk yield
KW  -holstein
AB  - Heterogeneity of the residual variances was investigated for test day milk yields of Turkish Holsteins. A third order random regression model including the fixed, random additive genetic, permanent environmental and residual effects were used. Residual Variances (RV) of test day milk yields divided into different classes with 5 schemes as RV1, RV3, RV5, RV7 and RV10. Also, a structural model was fitted to residual variances of milk yields. The residual variances were estimated from 2.19-29.47 kg<SUP>2</SUP> and additive genetic variances were estimated 3.19-10.97 kg<SUP>2</SUP>. The heritability estimates ranged from 0.12-0.81. The third order random regression models with RV7 and RV10 schemes were found to be better than others for evaluation of residual variances.
ER  -