[ Objective] To observe the distribution of major pathogenic bacteria of cow mastitis in milk in vitro. [ Method] The Staphylococcus auo reus and Escherichia coil （ E. coil） were added into the milk. After standing ...[ Objective] To observe the distribution of major pathogenic bacteria of cow mastitis in milk in vitro. [ Method] The Staphylococcus auo reus and Escherichia coil （ E. coil） were added into the milk. After standing for 8, 12 and 24 h at 4 ℃, the milk were divided into upper, middle and lower three equal parts. The bacterial counts distributed in the three parts of milk were respectively determined by plating colony-counting method. [ Result] The counts of these two pathogenic bacteria in upper milk were higher than that in middle and lower milk significantly （ P 〈 0.001 ）, and no significant difference was found between middle milk and lower milk. [ Conclusion] The pathogenic bacteria of cow mastitis can float with fat droplet in milk and then invade into the deeper tissue of mammary gland.展开更多
基金supported by the Major Scientific and Technological Agricultural Projects in Zhejiang Province(2005C12015)Hangzhou Major Scientific and Technological Projects (20052112A06)
文摘[ Objective] To observe the distribution of major pathogenic bacteria of cow mastitis in milk in vitro. [ Method] The Staphylococcus auo reus and Escherichia coil （ E. coil） were added into the milk. After standing for 8, 12 and 24 h at 4 ℃, the milk were divided into upper, middle and lower three equal parts. The bacterial counts distributed in the three parts of milk were respectively determined by plating colony-counting method. [ Result] The counts of these two pathogenic bacteria in upper milk were higher than that in middle and lower milk significantly （ P 〈 0.001 ）, and no significant difference was found between middle milk and lower milk. [ Conclusion] The pathogenic bacteria of cow mastitis can float with fat droplet in milk and then invade into the deeper tissue of mammary gland.
