TY  - JOUR
T1  - Correlation of Breeding Value, Milk Production and Lactation Persistency Traits During Complete and Incomplete Lactation Using Random Regression Model
AU - , Reza Seyed-Sharifi AU - , Jamal Seif-Davati AU - , Bahram Fathi-Achachlouei 
JO  - Journal of Animal and Veterinary Advances
VL  - 7
IS  - 11
SP  - 1405
EP  - 1409
PY  - 2008
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2008.1405.1409
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2008.1405.1409
KW  - Milk production and persistency
KW  -random regression model
KW  -test day records
AB  - In this investigation, 29800 data related to test day of milk production from 2716 Holstein first calving and daughter from 167 sire cows were analyzed based of random regression model (RR/CF) and REML (Restricted Maximum Likelihood). Method incomplete lactating 5-90 and 5-120 days in correlations to complete lactating were 0.67 and 0.72, respectively. With lactation progress, the correlation was increased. The correlation during incomplete lactation period 5-240 days was 0.91. The correlation value for lactating persistency trait for incomplete lactating period 5-150 days were 0.68. By milk production increasement during incomplete production period of 5-240 days this value reached to 0.91. Also, this correlation for 2 month interval (3 month recording) for milk production and lactating persistency was 0.88 and 0.59, respectively. This correlation for milk production and lactating persistency in 1 month interval (2 month recording) was reached to higher than 0.90.
ER  -