Abstract
Milks from individual cows were classified according to their heat stability-pH relation as Type-A (maximum and minimum heat stability) and Type-B (no minimum heat stability). The heat stability responses of these milks could be changed from Type-A to -B and from-B to -A by adding K-casein and [beta]-lactoglobulin, respectively. Addition of either [alpha]s- or [beta]-casein did not affect the heat stability of milk. The heat stability-pH relation of milk heated at 90[degree]C for 10 min. was no longer affected by the addition of K-casein.