Milk analysis concerning lactose content showed the highest lactose content (6.26%) in the month of January and the lowest (4.93%) in June. The milk from zones A and B contained high lactose percentage (5.60% and 5.63%, respectively) while the zone C contained the lowest (5.26%) (Fig. 3). The decrease in lactose contents can be attributed to health conditions of the cow. Mastitis causes the passage of lactose from milk to blood and increases the permeability of udder tissues