Most studies of the textural properties of set-style yoghurt gels were measured empirically as firmness or
viscosity. The relevance of viscosity measurements in a set gel is unclear, although it is important in stirred-style yoghurts. It is well accepted that denaturation of whey proteins increases the firmness and viscosity of yoghurt . Most rheological parameters characterizing casein gels (e.g. the dynamic moduli) depend on the number and strength of bonds between the casein particles, on the structure of the latter and the spatial distribution of the strands making up these particles