ChileanJAR

Twenty-four Holstein calves, 2 to 4 days of age, were used in a factorial design to compare two starter concentrate supplements that differed in content of alfalfa hay and two growth concentrate supplements that differed in content of rapeseed meal and dried sugar beet pulp.
The trial lasted for 180 days. Alfalfa hay was fed ad líbitum during the entire trial periodo During the first 45 days each calf received 160 liters of milk. In addition, Group I (12 calves) was fed a starter con:entrate supplement for the first 75 days that contained 20% alfalfa hay (S-1) while Group II (12 calves) was fed a starter concentrate supplement that contained 30% alfalfa hay (S-2). For the remainder of the trial period (105 days), 6 calves from each group received a growth concentrate supplement containing 25% rapeseed meal and 25% beet pulp (G-1) and 6 calves from each group received a growth concentrate supplement containing 15% rapeseed meal and 20% beet pulp (G-2). The four combinations of concentrate supplements were: (a) S-1 and G-1 (b) S-1 and G-2 (c) S-2 and G-1 and (d) S-2 and G-2.