Fig. 4From: Indirect quantification of IgG using a digital refractometer, and factors associated with colostrum quality in Norwegian Red CattleThe association between IgG in bovine colostrum quantified directly, with the gold standard (single radial immunodiffusion) and indirectly using a handheld digital refractometer in colostrum samples from 167 Norwegian Red dairy cows in 19 herdsBack to article page