... VCK thu nhn t c voi kg /con/ ngy 1,19 1,18 1,14 VCK thu nhn t rm kg /con/ ngy 1,99 1,85 1,89 VCK thu nhn t T tinh kg /con/ ngy 0,89 0,90 0,91 Tng VCK thu nhn kg /con/ ngy 4,07 a 3,93 ... gain of the groups fed the diet with 60% and 30% concentrate replcaed and of the control was 545, 510, and 446 g/head/day, respectively. The feed conversion ratio was better with the groups fed ... Replacement of 60% and 30% concentrate with the mixture saved 5,288.48 - 3,443.45 VND/kg of weight gain in comparison with the control (P<0.05). Key words: Cassava, concentrate, hay, male calves,...