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Friesian cows were used in a long-term feeding experiment over 3 complete lactations. After first calving, cows were randomly allotted to 2 groups : Group 1 (high) receiving concentrate according to milk yield ; Group 2 (low) was fed 80 % (wk 3-8), 60 % (wk 9-15), 40 % (wk 1629) and 30 % (>wk 29) of their demand with an average concentrate allowance of 50 % of group 1. Concentrate allowance was adjusted weekly for each cow according to milk yield. The roughage consisted (on dry matter -(DM)basis) of 50 % hay and 50 % grass silage (9 MJ ME/kg DM) throughout the experiment. Cows were kept in a loose-house stable where daily intake of roughage and concentrate was recorded automatically and continuously for each cow. In addition, individual liveweight and milk yield were measured daily. Mean daily values over the whole lactation for

The effect of number of lactation and concentrate level on feed intake and performance of dairy cows