Influence of race and the season on the chemical composition of cow's milk

Two factors of variation of milk quality modern cow "race and season" is evaluated and compared with farming practices in a private farm, in the region of El Shatt (Wilaya d 'El Tarf). A livestock dealer monitoring driving patterns cows was adopted Meanwhile, monthly withdrawals mixture of milk were analyzed for physical and chemical properties (pH, fat and protein contents) The results show that the fat content of milk from Holstein cows is greater) 3.62 ± 2.28) than cows Montbéliarde (3.33% ± 3.08, p <0.001), The protein content of milk from cows Montbeliarde is highest with a maximum of 39.0 g / l and a mean of 36.2 g / l (p <0.001). An analysis of variance showed a significant race season effect (P <0.05) for the two parameters studied (TB and TP). The fat content and milk protein of Holstein and Montbéliarde rose 4.83 g / l, respectively, and 3 g / l. Similarly, the fat content increased 0.76 g / l, respectively, and + 3.66 g /l. The quality of milk of both breeds is poor. The average fat content of less than 30 g / kg while protein levels were higher than europiénne standards. This result can be explained by the culture conditions, including food.