Raw milks were not standardised in terms of fat and dry matter contents.
All milks were pasteurisated at 85 C/15 min and then cooled to 45 C.
The starter culture was added to milk at 2% (w/w) ratio and incubated at 43–45 C.
Incubation was ended at around pH 4.6–4.7.
All yoghurts were cooled to 10–15 C.
Then yoghurts were kept at 4–5 C for 12–14 h to form the crystalline of milk fat.