Materials and Methods
Fresh cow’s and goat’s milk were obtained from Khartoum North (Hilat Koko). They were collected in sterilized screw capped bottles immediately after milking, and kept at low temperature by using refrigerator to suppress microbial growth. Powder of calf’s rennet (Hansen Sticks, France) was obtained from local market and fresh Capo yoghurt was used as starter culture obtained from local market.