Division 7.1 Visual estimationF1
For visual evaluation of the amount of bovine milk it is advisable to adjust the concentrations of samples and standards to obtain the same level of intensity of the ovine, caprine and/or buffalo γ 2 - and γ 3 -caseins (see ‘γ 2 E,G,B’ and ‘γ 3 E,G,B’ in Figures 4 a, b and Figure 5). After which the amount of bovine milk (less than, equal to or greater than 1 %) in the unknown sample can be judged directly by comparing the intensity of the bovine γ 3 - and γ 2 -caseins (see ‘γ 3 C’ and ‘γ 2 C’ in Figures 4 a, b and Figure 5) to those of the 0 % and 1 % reference standards (ewe, goat) or, laboratory interim-standards (buffalo).