The Relationship Between Milk Yield and the Incidence of Some Diseases in Dairy Cows

摘要

Logistic regression models were used to examine the relationship between milk yield and incidence of certain disorders. Lactations (n = 2197) of 1074 Holstein - Friesian cows from 10 dairies (25 to 146 cows per dairy) In Lower Saxony were studied. The 305 - d yield from The previous and current lactations served as the stan - Dards for milk yield. Eight disorder complexes were Considered: retained placenta, metritis, ovarian cysts Mastitis, claw diseases, milk fever, ketosis, and dis - Placed abomasum. Each disorder complex was modeled Separately.