Evaluation of Eight Cow-Side Ketone Tests in Milk for Detection of Subclinical Ketosis in Dairy Cows
The objective of this study was to evaluate eight cow- side ketone tests when used with milk for detection of subclinical ketosis. A total of 469 dairy cows in the first week of lactation were studied. Twelve percent of these cows had subclinical ketosis, defined as >1400 µmol of β-hydroxybutyrate/L of blood serum. The Pink test liquid and the Ketolac test strip were highly sensitive for subclinical ketosis when used with milk. The Uris- can and Rapignost test strips were poorly sensitive; the Ketostix, Ketur-Test, and Medi-Test-Keton test strips and the Acetonreagenz test tablet were insensitive for subclinical ketosis when used with milk. Pink and Ke- tolac milk ketone tests are potentially useful tools for use in a routine monitoring program to detect subclini- cal ketosis in early postpartal dairy cows.