PDF(Pubmed)
Abstract：
Introducing Holstein cows on Qinghai-Tibetan Plateau is a potential solution to enhance local milk production. However, the relationship between milk quality and altitude in China remains unknown. Therefore, the components and plasmin (PL) system of raw milk from different altitudes (sea level, 1600, 2700, and 3800 m) were investigated. The daily milk production of Holstein cows and PL activity decreased as the altitude increased. However, the components content of raw milk, plasminogen (PLG)/PL ratio, activities of PLG and plasmin activator (PA) increased with altitude. The pasteurization resulted a significant decrease in PA activity of all milk and a significant increase in PL activity in milk collected at higher altitudes (2700 and 3800 m), suggesting the pasteurization was unsuitable for preserving milk at higher altitudes. This study offered references for the production and storage of milk after introducing Holstein cows on Qinghai-Tibetan Plateau.
摘要：
在青藏高原引进荷斯坦奶牛是提高当地牛奶产量的潜在解决方案。然而,在中国，牛奶质量与海拔之间的关系仍然未知。因此,来自不同海拔高度的原料奶的成分和纤溶酶(PL)系统(海平面，1600、2700和3800m)进行了调查。随着海拔高度的增加，荷斯坦奶牛的每日产奶量和PL活性下降。然而,原料奶的成分含量，纤溶酶原(PLG)/PL比值,PLG和纤溶酶激活剂(PA)活性随海拔高度的增加而增加。巴氏灭菌导致所有牛奶的PA活性显着降低，并且在较高海拔（2700和3800m）收集的牛奶中PL活性显着增加。表明巴氏杀菌不适合在高海拔地区保存牛奶。该研究为在青藏高原引种荷斯坦奶牛后的牛奶生产和储存提供参考。
