This study evaluated the effects of 2 milk replacer (MR) feeding rates and addition of functional fatty acids (FA) to calf feeds on total track digestion (TTD). Male Jersey calves (n = 48; initially 30 ± 2.4 kg BW; 3 to 7 d of age) were randomly assigned to 4 treatments in a 2 × 2 factorial arrangement of MR feeding rate (454 g for 42 d, then 227 g for 7 d [Low]; or 454 g for 3 d, 568 g for 4 d, 681 for 35 d and 341 for 7 d [High]) and supplementation with (FA+) or without (FA-) a FA blend (NeoTec5g, Provimi) added to MR and CS. Milk replacer (24% CP, 21% fat DM) was reconstituted to 14% solids and fed in 2 equal feedings for 42 d and a.m. only for 7 d. Textured calf starter (CS; 20% CP, 39% starch DM) and water were offered for ad libitum consumption. From d 57–112, CS was mixed with 5% chopped grass hay. Up to d 56, calves were housed individually and from d 57–112 in groups (n = 4/pen). Total-tract digestion was measured from 5 calves/treatment at wk 3 and 7, and from all pens at 9, 11, and 15 wk using acid insoluble ash as a digestion marker. Data were analyzed as a completely randomized design with repeated measures when appropriate, with calf as the experimental unit d 1–56 and pen thereafter. No differences were detected in CS intake or performance. No TTD differences were detected at wk 3. Shortly after weaning (7 wk) TTD of DM, OM, starch, NDF and ADF were greater (P < 0.05) for calves fed Low; and TTD of DM, OM, NDF, ADF and fat were greater (P < 0.05) for calves fed FA+. Average TTD for DM, OM, starch, NDF, ADF and fat at 7 wk were 79, 80, 97, 40, 28 and 75%, respectively. Combined group pen TTD (wk 9, 11 and 15) of DM, OM, NDF and ADF were greater (P < 0.05) for calves fed Low; and DM, OM, sugar, NDF, ADF, CP and fat were greater (P < 0.05) for calves fed FA+. Average TTD for wk 9, 11 and 15 of DM, OM, sugar, NDF, ADF, CP and fat were 78, 80, 95, 47, 39, 78, 67%, respectively. In this study, feeding Jersey calves more MR had a negative impact on post-weaning digestion of feeds, whereas supplementing the diets with functional FA improved digestion.