Leitner Gabriel, Merin Uzi, Silanikove Nissim, Ezra Efraim, Chaffer Marcelo, Gollop Natan, Winkler Marta, Glickman Anita, Saran Arthur
National Mastitis Reference Centre, Kimron Veterinary Institute, Israel.
J Dairy Res. 2004 Aug;71(3):311-5. doi: 10.1017/s0022029904000305.
The study was aimed at identifying the pathogens causing subclinical udder infections in representative Israeli dairy goat herds and determining their effect on milk quality. Five hundred goats in ten flocks of various breeds and crossbreeds were surveyed. Of the 500 goats, 13.4% were in their first lactation, 36.4% were in their second lactation and 50.2% were in their third or higher lactation. Percentages of udder halves with subclinical intramammary infection in the flocks ranged from 35 to 71%. The effect of the bacteriological infection on somatic cells count (SCC) was significant (P<0.001). Various species of coagulase-negative staphylococci (CNS), mainly Staphylococcus caprae and Staphylococcus epidermidis, were the main pathogens in infected udder halves. Lactation number did not significantly influence either infection rate of udder halves or SCC, although the percentage of udder halves with no bacteriological findings was higher at the first lactation than at the third lactation. Milk composition (fat, protein and lactose) varied among flocks, with lower mean total protein in uninfected halves than in infected ones and higher lactose in uninfected than infected halves.
本研究旨在确定以色列有代表性的奶山羊群中引起亚临床乳房感染的病原体，并确定它们对牛奶质量的影响。对十个不同品种和杂交品种羊群中的500只山羊进行了调查。在这500只山羊中，13.4%处于第一个泌乳期，36.4%处于第二个泌乳期，50.2%处于第三个或更高泌乳期。各羊群中亚临床乳房内感染的半侧乳房百分比在35%至71%之间。细菌感染对体细胞计数（SCC）的影响显著（P<0.001）。各种凝固酶阴性葡萄球菌（CNS），主要是山羊葡萄球菌和表皮葡萄球菌，是感染半侧乳房的主要病原体。泌乳次数对半侧乳房感染率或SCC均无显著影响，尽管第一个泌乳期无细菌学检查结果的半侧乳房百分比高于第三个泌乳期。各羊群的牛奶成分（脂肪、蛋白质和乳糖）各不相同，未感染半侧乳房的平均总蛋白含量低于感染半侧，未感染半侧的乳糖含量高于感染半侧。
