Table 1.

Immunoglobulin concentration in the first milking colostrum and milk^a

Immunoglobulin class	Molecular mass (kDa)	Concentration (g L−1)
		Milk	Colostrum
IgG1	146–163	0.3–0.6	15–180
IgG2	146–154	0.06–0.12	1–3
IgG total		0.15–0.8	20–200
SIgA	385–430	0.05–0.1	1–6
IgM	900	0.04–0.1	3–9

^aData compiled from Marnila and Korhonen (2002) and Elfstrand et al. (2002).