Abstract: In this paper, 7 Murrah×Xilin buffaloes which were in their first parturition were chosen in experiment. Milk on 2 h, 12 h, 24 h, 36 h, 48 h, 3 d, 4 d, 5 d, 6 d, 7 d, 15 d, 30 d, 60 d, 90 d, 120 d, 150 d, 180 d and 210 d postpartum respectively were collected. The yield, physical properties and chemical composition of milk were assayed. The results were shown as follows: the apex of yield appeared at the third month is 126.56 kg, total yield of 210 d 805.47 kg, yield per day 3.84 kg; and pH value and lactose 6.23 and 2.33% respectively at 2 h postpartum, increased with lactation, then changed between 6.51～6.55 and 4.42%～6.02% respectively after 15d. The acidity was 36.73°T at 2 h, decreased with lactation, then changed between 19.43～23.15 °T. The dencity, protein and total solid were 1.057, 18.23%, 31.460% at 2 h respectively, changed sharply in 3 d, then varied within 1.028～1.031, 4.83%～6.02%, 19.12%～20.59% respectively. The fat was 9.73% at 2 h, increased to 11.57% at 36 h, then decreased with lactation, was 9.76% at 4 d, then changed within 8.26%～9.06%. Casein/total protein increased with lactation, was 40.15% at 2 h and 79.13% at 5 d, then varied within 81.07%～83.23%.

Key words: buffalo milk, yield, physical properties, chemical composition