Table 10.1.

Immunoglobulin concentrations in bovine colostrum and milk

Immunoglobulin class	Molecular mass (kDa)	Concentration (gL− 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

Data compiled from Marnila and Korhonen (2002), Elfstrand et al. (2002) and Mehra et al. (2006).

^*= first milking.