CLINICAL MASTITIS IN 2 CALIFORNIA DAIRY HERDS PARTICIPATING IN CONTAGIOUS MASTITIS CONTROL PROGRAMS

被引：57

作者：

GONZALEZ, RN ^{[1
]}

JASPER, DE ^{[1
]}

KRONLUND, NC ^{[1
]}

FARVER, TB ^{[1
]}

CULLOR, JS ^{[1
]}

BUSHNELL, RB ^{[1
]}

DELLINGER, JD ^{[1
]}

机构：

[1] UNIV CALIF DAVIS,SCH VET MED,DAVIS,CA 95616

来源：

JOURNAL OF DAIRY SCIENCE | 1990年 / 73卷 / 03期

关键词：

clinical mastitis; coliform bacteria; environmental streptococci;

D O I：

10.3168/jds.S0022-0302(90)78716-4

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

The occurrence of clinical mastitis in two large California dairy herds over a 3-yr period is described. Herds had been participating for 15 or 22 yr in mastitis control programs against Streptococcus agalactiae and Staphylococcus aureus, had low bulk tank SCC, and had maintained good standards of hygiene and husbandry, but clinical mastitis remained a serious problem. A total of 1654 clinical mastitis cases were detected: the annual incidence in each herd was 49%. Coliform bacteria and environmental streptococci were etiological agents in 60% of the total clinical mastitis cases; coliforms produced 1.6 times more clinical mastitis than environmental streptococci. A higher susceptibility to clinical mastitis, primarily from coliform bacteria and environmental streptococci, was found in the first months of lactation. Clinical mastitis incidence peaked for cows in lactations 4 and 5 and was lowest during the first lactation. Highest incidence of clinical mastitis due to coliform bacteria and environmental streptococci at each dairy occurred during the rainy season (late fall and winter). © 1990, American Dairy Science Association. All rights reserved.

引用

页码：648 / 660

页数：13

共 29 条

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