The objective of this study was to assess the effect of providing additional IgG to colostrum from primiparous cows on neonatal Holstein calves. The study was conducted on 60 Holstein bull calves enrolled at birth. During their first feeding, 30 calves received pasteurized colostrum (GC) and 30 calves received pasteurized colostrum supplemented with a commercial colostrum replacer (GSC; 55 g IgG). All colostrum was collected from primiparous cows, pasteurized at 60°C for 30 min, supplemented (if GSC) and frozen until use. When suckling was the strongest, calves received colostrum from one of the treatments, warmed to 38°C. All calves were bottle fed in the first feeding, with an average intake of 2.3L within the first 2 h of life. Blood samples were taken at 24h of life in vacutainer tubes and tested for total proteins with a manual refractometer, brix, and radial immunodiffusion (RID). A Wilcoxon test was used to analyze and compare serum IgG and apparent efficiency of absorption of IgG (AEA) while colostrum brix was compared with HSU´s MCB test. Analysis of colostral IgG indicated that GC had 1455 ± 7.40 mg/dL, and GSC had 1505.5 ± 7.32 mg/dL (P = 0.008). Brix results for colostrum were greater for GSC than GC (9.58 ± 0.6 vs. 8.40 ± 1.1; P < 0.05). Calves fed GC had greater serum IgG than calves fed GSC (1661 ± 1955 vs. 2031 ± 1987 mg/dL; P = 0.0041). Calves fed GSC had greater AEA compared wtih calves fed GC (48.1 ± 7.1 vs. 43.9 ± 5.6%; P < 0.001). The study indicates that pasteurized colostrum from primiparous cows supplemented with a commercial colostrum replacer resulted in high serum IgG and AEA in neonatal Holstein calves. This approach is useful for feeding colostrum from primiparous cows without compromising passive immunity.