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 (Bruckmaier and Blum, 2004 and Sharif et al., 2007). The results recorded for the lactose content of fresh milk in the present study are in accordance with the findings of Dobranic et al. (2008) who analyzed the bulk cow milk samples and found that the lactose contents of cow’s milk undergo marked seasonal variation. It was also reported that the lactose content of milk was higher during winter (4.5%) and lower during summer (3.95%) and the concentration also varies within the cities (Kittivachra et al., 2007, Mahboba et al., 2007 and Ozrenk and Inci, 2008).
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 (Bruckmaier and Blum, 2004 and Sharif et al., 2007). The results recorded for the lactose content of fresh milk in the present study are in accordance with the findings of Dobranic et al. (2008) who analyzed the bulk cow milk samples and found that the lactose contents of cow’s milk undergo marked seasonal variation. It was also reported that the lactose content of milk was higher during winter (4.5%) and lower during summer (3.95%) and the concentration also varies within the cities (Kittivachra et al., 2007, Mahboba et al., 2007 and Ozrenk and Inci, 2008).
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