In experiment 1, the interactive effects of forage provision with corn processing methods including steam flaking (SF) or cracking (Cr) on performance responses were evaluated in a 2 × 2 factorial arrangement. There was an interaction between corn processing methods and forage supplementation for starter intake during d 31-50 of experiment, that calves fed on SF with forage starter had greater starter intake than those fed on SF without forage. Furthermore, forage inclusion increased average daily gain (ADG) of calves fed on SF corn based diet but not in calves fed on Cr corn based diet during the pre-weaning and overall periods. In experiment 2, interaction between starter diet processing's including cracking or grounding and fiber sources including wheat straw or beet pulp were evaluated. Calves supplemented with wheat straw had more total DMI compared to beet pulp supplemented calves at pre- and post-weaning periods. Interaction between starter diet processing and fiber sources on ADG indicated that in ground starter diet, wheat straw supplementation resulted to more ADG compared to beet pulp addition at pre-weaning period. Results of the present studies indicated that interaction between processing methods with forage provision or fiber sources may affect performance response of dairy calves. Keywords : Corn Processing, Dairy Calves, Fiber sources, Forage provision
