Table 3.

Additive genetic (${\mathrm{r}}_{\mathrm{ag}}$) and phenotypic (${\mathrm{r}}_{\mathrm{p}}$) correlations of protein content and protein yield with BRIX and IgG

Trait	BRIX, %		IgG, g/L
	${\mathrm{r}}_{\mathrm{ag}}$	${\mathrm{r}}_{\mathrm{p}}$	${\mathrm{r}}_{\mathrm{ag}}$	${\mathrm{r}}_{\mathrm{p}}$
PCC, %	0.99 (0.04)	0.92 (0.01)	0.92 (0.08)	0.85 (0.08)
PCM, %	− 0.15 (0.51)	0.03 (0.05)	− 0.04 (0.56)	0.01 (0.05)
PYM, kg/d	− 0.03 (0.60)	0.02 (0.05)	0.09 (0.66)	− 0.09 (0.05)

BRIX  refractive index, IgG  immunoglobulins G, PC_C  colostrum (total) protein content, PC_M  milk (total) protein content, PY_M  milk protein yield

Standard errors are within parentheses