Abstract
Profiles of blood metabolites of high produced dairy cows were examined for milk prodaction and reproduction in 171 Holstein cows. Mean milk production ( 305-d mature equivalent) of the herd was over 8, 500kg( 8, 703-9, 602kg) and under 8, 500kg( 7, 121-8, 070kg) for high( 4 herds) and middle( 5 herds) groups. Cows of each groups were classified into 5 lactating stages (early, height, middle, late, dry). In the high group, plasma glucose and serum albumin were stable in high level through 5 stages. In the middle group, glucose level at the early stage and albumin level at middle stage were lower than in the high group. Changes in body condition scores in the high group were fewer than the middle group. The high group showed good fertility and low occurran of metabolic disease. No significant differences in milk components could be detected.
