The aim of this research was to evaluate the effect of supplementing calcium salts from linseed oil (AG-Ca; rich in linolenic acid, C18:3n-3) to partially replace corn grain on energy status during early lactation. In a 10-wk assay, 38 primiparous and multiparous Holstein dairy cows (average ± SD; 55 ± 18.1 DIM, 594 ± 96.8 kg BW, 2.71 ± 0.4 BCS, 2.0 ± 1.4, and 38 ± 9.4 kg/d milk yield) were used in a complete randomized block design. Cows were assigned to one of 2 treatments (O3: AG-Ca supplementation or CON: control, no AG-Ca supplementation) and were blocked by DIM, number of lactation, BW and milk production. Samples of blood were analyzed for glucose (GLU), BHB, growth hormone (GH), insulin (INS) and insulin-like growth factor-1 (IGF-1) once every 15 d. The BW, BCS (1–5) and milk production were recorded weekly. Isoenergetic diets were formulated to meet requirements of a Holstein dairy cow of 650 kg BW with 40 DIM, producing 40.0 kg/d of milk with 3.6% fat (NRC, 2001). Diets (O3 and CON) included 12 kg DM of alfalfa pasture (Medicago sativa), 13.5 kg DM of TMR (63.5% corn silage, 18.0% soybean meal, 10.6% cracked corn and 7.9% alfalfa hay) and treatment concentrate (O3, 5.2 kg DM including 0.85 kg/d of AG-Ca (DM: 82,3% DM, 13,2% ashes, 86,8% EE and 35,82% C18:3n-3), commercial feed and cracked corn; CON, 5.9 kg DM including commercial feed and cracked corn) given at milking time (twice a day). Estimated total DMI was estimated by NRC (2001) while pasture DMI was estimated by subtracting TMR and concentrate DMI to Total DMI. Data were analyzed using the MIXED procedure of SAS with significance declared at P ≤ 0.05. Supplementation did not change milk production (O3: 33.4 kg d-1 and CON: 33.8 kg d-1; P > 0.10), neither blood parameters (GLU: 0,59 vs. 0,60 g l-1, BHBA: 0,59 vs. 0,57 mmol l-1, INS: 0,91 vs. 0,95 ng ml-1, GH: 2.42 vs. 2.40 ng ml-1, IGF-1: 109.37 vs. 109.79 ng ml-1, for O3 and CON respectively; P > 0.10) nor BW (O3:584.27 kg and CON: 589.58 kg; P > 0.10) and BCS (O3: 2.72 and CON: 2.64). These results suggest that supplementation with AG-Ca of linseed oil could be an option to partially replace corn grain without affecting the energy status during the early lactation.