Age, breed and seasonal patterns in the occurrence of ten dairy cow diseases: a case control study.

摘要: A total of 5,990 occurences the diseases abomasal displacement, cystic graafian follicles, endometritis, hypocalcemia, ketosis, mastitis, metritis, ovarian hypofuction, pyometra and retained placenta were included in a case control study. The study was based on hospital population Holstein, Ayrshire, Guernsey Jersey cows who at least two years age. data retrieved from computer storage material abstracted for Veterinary Medical Data Program. transcription original records to these abstracts examined as source error. An attempt made define each by reference random samples clinical records. Using log-odds method, trends noted youngest be increased risk reproductive uterine diseases. There tendency peaks disease occurrences winter (as opposed summer) months.