Yoghurts were made from pasteurised and homogenised goat milk (2.5% protein), goat milk fortified
with a milk protein isolate (5% protein) and cow milk (3% protein), by acidification with a starter
culture at 43 C until a pH of 4.6 was reached. The rheological and textural properties of gels and
yoghurts were analysed using dynamic low amplitude oscillatory rheology and back extrusion texture
analysis. Gelation and fermentation times of goat milk were longer, while gelation pH, storage moduli
(G0) and yield stress values were lower, compared with those of cow milk. Textural properties of goat
milk yoghurts such as firmness, consistency, cohesiveness and viscosity index were very poor.
Consequently, the products could not be classified as set type yoghurts. Fortification of goat milk with
a milk protein isolate contributed to a significant improvement of the rheological and textural properties
of yoghurt.