Table 1.

Immunoglobulins (IgX), lactoferrin (Lf), and serum albumin (BSA) concentration, mass, and ratio in colostrum when compared to that of blood serum

Factor	Mean ± SEM Colostrum	Min-max Colostrum	Mean ± SEM Colostrum	Min-max Colostrum	Mean ± SEM Blood	Ratio mg/mL Colostrum/Blood
Measure	mg/mL	mg/mL	Grams	Grams	mg/mL	Mean vs. Max
BSA	1.2 ± 0.5	0.4–2.6	2.2 ± 1.8	0.1–9.7	36.5 ± 5	0.03–0.07
IgG1	34.96 ± 12.2	11.8–74.2	291.6 ± 315	14–2,223	1 ± 0.3 a	35–74
IgG2	6.00 ± 2.8	2.7–20.6	3.9 ± 2.3	0.2–10.3	13.3± 0.4	0.45–1.5
IgA	1.66 ± 1	0.5–4.4			0.41	4.0
IgM	4.32 ± 2.8	1.1–21.0			2.4	1.8
Lf*	45 ± 135	0.25–267	195.9 ± 453	11–31,558	0.2

Data from Baumrucker et al., 2021;

^*unpublished data (Baumrucker & Macrina, 2023).

^a Blood concentration at week before birth