The lactic acid content of yoghurt samples rises in line with the increase in total solid content of yoghurt (Atamer, Caric, Milinovic, & Gavaric, 1996). Consequently,the increase in dry matter content in yoghurt samples led to the growth of lactic acid content of Yayık butter samples. Yoghurt starter organisms have a limited acidification rate below pH 4.8–5.0.