Ewe milk production peaks approximately 3 weeks postpartum, with intake potential peaking approximately 6 weeks postpartum. The aim of this study was to investigate the effect of concentrate supplementation on ewe DMI during early lactation. Fifty-four twin suckling ewes were allocated to one of 3 dietary treatments (n = 18) in a randomized block design on d 7 (+/− 2 d) of lactation as follows: GO: Ad-lib zero grazed grass, GC: Ad-lib zero grazed grass and 500g fresh weight (FW) of concentrate feed for 49 d postpartum and GC21: Ad-lib zero grazed grass and 500g FW of concentrate feed for 21 d postpartum. Ewes were penned with their progeny from 72 h postpartum until d 49 lactation. Lambs were offered free access to a creep area bedded with straw and were offered fresh water and zero grazed grass. Grass was harvested each morning using a single chop zero grazer from perennial ryegrass based swards with an average pre-grazing herbage mass of 1100kg DM/ha with an average DM, protein and neutral detergent fiber content of 18.0, 18.4 and 45.0% respectively. Individual ewe intakes were recorded daily from d 7 to 49 of lactation. Rumen fluid samples were taken before and 7 d post-dietary introduction to assess rumen fermentation. Milk yield and composition was measured at 7 d intervals starting on d 14 (± 2 d) of lactation. Statistical analysis was carried out using generalized least squares means in SAS v9.4. Ewes from GO treatment had higher grass DMI (1.96kg) compared with GC (1.65kg) ewes (P < 0.05) and tended to have higher grass DMI than GC21 (1.84kg) ewes (P < 0.10). However, total DMI did not differ between treatments (P > 0.05). Rumen pH for GC and GC21 ewes decreased between d 0, 6.65, and d 7, 6.09 (P < 0.01). Milk production tended to be lower during early lactation for GC21 (1.85kg) ewes compared with GC (2.11kg) ewes (P < 0.10). No difference was observed between treatments in milk fat, protein or net energy (P > 0.05). Concentrate supplementation did not lead to increased DMI but rather acted as a substitute for grazed grass.