一所大学奶牛场畜群的存活几率和疾病发生率及模式。
The rates and patterns of survivorship and disease in a university dairy herd.
作者信息
Cobo-Abreu R, Martin S W, Stone J B, Willoughby R A
出版信息
Can Vet J. 1979 Jul;20(7):177-83.
The rates and patterns of disease occurrence and survivorship were determined over a six year period in a university operated dairy herd. Of the ten diseases selected for study, clinical mastitis occurred most frequently with an incidence rate of 10.1% and displaced abomasum occurred least frequently with an incidence rate of 4.4%. The occurrence of all disease except those of the ovary was associated with the age of the cow. Mastitis, pneumonia and cystic graafian follicles tended to reoccur in the same cow after the initial occurrence. The average culling rate was 25.6% and the median number of years cows survived in the herd was 3.4 years. Methods for calculating the various rates and survivorship are described and their interpretation discussed.
在一所大学运营的奶牛群中，对六年期间疾病发生的速率和模式以及存活率进行了测定。在选定研究的十种疾病中，临床乳腺炎最为常见，发病率为10.1%，皱胃移位最不常见，发病率为4.4%。除卵巢疾病外，所有疾病的发生都与奶牛年龄有关。乳腺炎、肺炎和囊性格拉夫卵泡在初次发病后往往会在同一头奶牛身上再次出现。平均淘汰率为25.6%，奶牛在牛群中存活的中位数年限为3.4年。描述了计算各种速率和存活率的方法，并讨论了其解释。
Zotero 插件